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<title xml:lang="en">Cinnamic Acid Conjugates in the Rescuing and Repurposing of Classical Antimalarial Drugs</title>
<author>
<name sortKey="Silva, Ana Teresa" sort="Silva, Ana Teresa" uniqKey="Silva A" first="Ana Teresa" last="Silva">Ana Teresa Silva</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Bento, Clara M" sort="Bento, Clara M" uniqKey="Bento C" first="Clara M." last="Bento">Clara M. Bento</name>
<affiliation>
<nlm:aff id="af2-molecules-25-00066">i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af3-molecules-25-00066">IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Pena, Ana C" sort="Pena, Ana C" uniqKey="Pena A" first="Ana C." last="Pena">Ana C. Pena</name>
<affiliation>
<nlm:aff id="af4-molecules-25-00066">Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, P-1649-028 Lisboa, Portugal;
<email>ana.c.d.pena@gmail.com</email>
(A.C.P.);
<email>lmf@medicina.ulisboa.pt</email>
(L.M.F.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Figueiredo, Luisa M" sort="Figueiredo, Luisa M" uniqKey="Figueiredo L" first="Luísa M." last="Figueiredo">Luísa M. Figueiredo</name>
<affiliation>
<nlm:aff id="af4-molecules-25-00066">Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, P-1649-028 Lisboa, Portugal;
<email>ana.c.d.pena@gmail.com</email>
(A.C.P.);
<email>lmf@medicina.ulisboa.pt</email>
(L.M.F.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Prudencio, Cristina" sort="Prudencio, Cristina" uniqKey="Prudencio C" first="Cristina" last="Prudêncio">Cristina Prudêncio</name>
<affiliation>
<nlm:aff id="af5-molecules-25-00066">Ciências Químicas e das Biomoléculas, Escola Superior de Saúde—Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 400, P-4200-072 Porto, Portugal;
<email>cps@estsp.ipp.pt</email>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Aguiar, Luisa" sort="Aguiar, Luisa" uniqKey="Aguiar L" first="Luísa" last="Aguiar">Luísa Aguiar</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Silva, Tania" sort="Silva, Tania" uniqKey="Silva T" first="Tânia" last="Silva">Tânia Silva</name>
<affiliation>
<nlm:aff id="af2-molecules-25-00066">i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af3-molecules-25-00066">IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Ferraz, Ricardo" sort="Ferraz, Ricardo" uniqKey="Ferraz R" first="Ricardo" last="Ferraz">Ricardo Ferraz</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af5-molecules-25-00066">Ciências Químicas e das Biomoléculas, Escola Superior de Saúde—Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 400, P-4200-072 Porto, Portugal;
<email>cps@estsp.ipp.pt</email>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Gomes, Maria Salome" sort="Gomes, Maria Salome" uniqKey="Gomes M" first="Maria Salomé" last="Gomes">Maria Salomé Gomes</name>
<affiliation>
<nlm:aff id="af2-molecules-25-00066">i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af3-molecules-25-00066">IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af6-molecules-25-00066">ICBAS—Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, P-4050-313 Porto, Portugal</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Teixeira, Catia" sort="Teixeira, Catia" uniqKey="Teixeira C" first="Cátia" last="Teixeira">Cátia Teixeira</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Gomes, Paula" sort="Gomes, Paula" uniqKey="Gomes P" first="Paula" last="Gomes">Paula Gomes</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
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<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6982862</idno>
<idno type="RBID">PMC:6982862</idno>
<idno type="doi">10.3390/molecules25010066</idno>
<date when="2019">2019</date>
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<title xml:lang="en" level="a" type="main">Cinnamic Acid Conjugates in the Rescuing and Repurposing of Classical Antimalarial Drugs</title>
<author>
<name sortKey="Silva, Ana Teresa" sort="Silva, Ana Teresa" uniqKey="Silva A" first="Ana Teresa" last="Silva">Ana Teresa Silva</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Bento, Clara M" sort="Bento, Clara M" uniqKey="Bento C" first="Clara M." last="Bento">Clara M. Bento</name>
<affiliation>
<nlm:aff id="af2-molecules-25-00066">i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af3-molecules-25-00066">IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Pena, Ana C" sort="Pena, Ana C" uniqKey="Pena A" first="Ana C." last="Pena">Ana C. Pena</name>
<affiliation>
<nlm:aff id="af4-molecules-25-00066">Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, P-1649-028 Lisboa, Portugal;
<email>ana.c.d.pena@gmail.com</email>
(A.C.P.);
<email>lmf@medicina.ulisboa.pt</email>
(L.M.F.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Figueiredo, Luisa M" sort="Figueiredo, Luisa M" uniqKey="Figueiredo L" first="Luísa M." last="Figueiredo">Luísa M. Figueiredo</name>
<affiliation>
<nlm:aff id="af4-molecules-25-00066">Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, P-1649-028 Lisboa, Portugal;
<email>ana.c.d.pena@gmail.com</email>
(A.C.P.);
<email>lmf@medicina.ulisboa.pt</email>
(L.M.F.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Prudencio, Cristina" sort="Prudencio, Cristina" uniqKey="Prudencio C" first="Cristina" last="Prudêncio">Cristina Prudêncio</name>
<affiliation>
<nlm:aff id="af5-molecules-25-00066">Ciências Químicas e das Biomoléculas, Escola Superior de Saúde—Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 400, P-4200-072 Porto, Portugal;
<email>cps@estsp.ipp.pt</email>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Aguiar, Luisa" sort="Aguiar, Luisa" uniqKey="Aguiar L" first="Luísa" last="Aguiar">Luísa Aguiar</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Silva, Tania" sort="Silva, Tania" uniqKey="Silva T" first="Tânia" last="Silva">Tânia Silva</name>
<affiliation>
<nlm:aff id="af2-molecules-25-00066">i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af3-molecules-25-00066">IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Ferraz, Ricardo" sort="Ferraz, Ricardo" uniqKey="Ferraz R" first="Ricardo" last="Ferraz">Ricardo Ferraz</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af5-molecules-25-00066">Ciências Químicas e das Biomoléculas, Escola Superior de Saúde—Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 400, P-4200-072 Porto, Portugal;
<email>cps@estsp.ipp.pt</email>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Gomes, Maria Salome" sort="Gomes, Maria Salome" uniqKey="Gomes M" first="Maria Salomé" last="Gomes">Maria Salomé Gomes</name>
<affiliation>
<nlm:aff id="af2-molecules-25-00066">i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af3-molecules-25-00066">IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="af6-molecules-25-00066">ICBAS—Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, P-4050-313 Porto, Portugal</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Teixeira, Catia" sort="Teixeira, Catia" uniqKey="Teixeira C" first="Cátia" last="Teixeira">Cátia Teixeira</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Gomes, Paula" sort="Gomes, Paula" uniqKey="Gomes P" first="Paula" last="Gomes">Paula Gomes</name>
<affiliation>
<nlm:aff id="af1-molecules-25-00066">LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</nlm:aff>
</affiliation>
</author>
</analytic>
<series>
<title level="j">Molecules</title>
<idno type="eISSN">1420-3049</idno>
<imprint>
<date when="2019">2019</date>
</imprint>
</series>
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<front>
<div type="abstract" xml:lang="en">
<p>Cinnamic acids are compounds of natural origin that can be found in many different parts of a wide panoply of plants, where they play the most diverse biological roles, often in a conjugated form. For a long time, this has been driving Medicinal Chemists towards the investigation of the therapeutic potential of natural, semi-synthetic, or fully synthetic cinnamic acid conjugates. These efforts have been steadily disclosing promising drug leads, but a wide chemical space remains that deserves to be further explored. Amongst different reported approaches, the combination or conjugation of cinnamic acids with known drugs has been addressed in an attempt to produce either synergistic or multi-target action. In this connection, the present review will focus on efforts of the past decade regarding conjugation with cinnamic acids as a tool for the rescuing or the repurposing of classical antimalarial drugs, and also on future perspectives in this particular field of research.</p>
</div>
</front>
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</TEI>
<pmc article-type="review-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Molecules</journal-id>
<journal-id journal-id-type="iso-abbrev">Molecules</journal-id>
<journal-id journal-id-type="publisher-id">molecules</journal-id>
<journal-title-group>
<journal-title>Molecules</journal-title>
</journal-title-group>
<issn pub-type="epub">1420-3049</issn>
<publisher>
<publisher-name>MDPI</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">31878190</article-id>
<article-id pub-id-type="pmc">6982862</article-id>
<article-id pub-id-type="doi">10.3390/molecules25010066</article-id>
<article-id pub-id-type="publisher-id">molecules-25-00066</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Review</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>Cinnamic Acid Conjugates in the Rescuing and Repurposing of Classical Antimalarial Drugs</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Silva</surname>
<given-names>Ana Teresa</given-names>
</name>
<xref ref-type="aff" rid="af1-molecules-25-00066">1</xref>
<xref ref-type="author-notes" rid="fn1-molecules-25-00066"></xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0001-9019-7334</contrib-id>
<name>
<surname>Bento</surname>
<given-names>Clara M.</given-names>
</name>
<xref ref-type="aff" rid="af2-molecules-25-00066">2</xref>
<xref ref-type="aff" rid="af3-molecules-25-00066">3</xref>
<xref ref-type="author-notes" rid="fn1-molecules-25-00066"></xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Pena</surname>
<given-names>Ana C.</given-names>
</name>
<xref ref-type="aff" rid="af4-molecules-25-00066">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Figueiredo</surname>
<given-names>Luísa M.</given-names>
</name>
<xref ref-type="aff" rid="af4-molecules-25-00066">4</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Prudêncio</surname>
<given-names>Cristina</given-names>
</name>
<xref ref-type="aff" rid="af5-molecules-25-00066">5</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Aguiar</surname>
<given-names>Luísa</given-names>
</name>
<xref ref-type="aff" rid="af1-molecules-25-00066">1</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0002-6087-1487</contrib-id>
<name>
<surname>Silva</surname>
<given-names>Tânia</given-names>
</name>
<xref ref-type="aff" rid="af2-molecules-25-00066">2</xref>
<xref ref-type="aff" rid="af3-molecules-25-00066">3</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0002-1761-117X</contrib-id>
<name>
<surname>Ferraz</surname>
<given-names>Ricardo</given-names>
</name>
<xref ref-type="aff" rid="af1-molecules-25-00066">1</xref>
<xref ref-type="aff" rid="af5-molecules-25-00066">5</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0001-7657-2118</contrib-id>
<name>
<surname>Gomes</surname>
<given-names>Maria Salomé</given-names>
</name>
<xref ref-type="aff" rid="af2-molecules-25-00066">2</xref>
<xref ref-type="aff" rid="af3-molecules-25-00066">3</xref>
<xref ref-type="aff" rid="af6-molecules-25-00066">6</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Teixeira</surname>
<given-names>Cátia</given-names>
</name>
<xref ref-type="aff" rid="af1-molecules-25-00066">1</xref>
</contrib>
<contrib contrib-type="author">
<contrib-id contrib-id-type="orcid" authenticated="true">https://orcid.org/0000-0002-6018-4724</contrib-id>
<name>
<surname>Gomes</surname>
<given-names>Paula</given-names>
</name>
<xref ref-type="aff" rid="af1-molecules-25-00066">1</xref>
<xref rid="c1-molecules-25-00066" ref-type="corresp">*</xref>
</contrib>
</contrib-group>
<contrib-group>
<contrib contrib-type="editor">
<name>
<surname>Borges</surname>
<given-names>Fernanda</given-names>
</name>
<role>Academic Editor</role>
</contrib>
<contrib contrib-type="editor">
<name>
<surname>Garrido</surname>
<given-names>Jorge</given-names>
</name>
<role>Academic Editor</role>
</contrib>
<contrib contrib-type="editor">
<name>
<surname>Silva</surname>
<given-names>Tiago Barros</given-names>
</name>
<role>Academic Editor</role>
</contrib>
</contrib-group>
<aff id="af1-molecules-25-00066">
<label>1</label>
LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, P-4169-007 Porto, Portugal;
<email>up201303026@gmail.com</email>
(A.T.S.);
<email>luisa.aguiarts@gmail.com</email>
(L.A.);
<email>ricardoferraz@eu.ipp.pt</email>
(R.F.);
<email>catia.teixeira@fc.up.pt</email>
(C.T.)</aff>
<aff id="af2-molecules-25-00066">
<label>2</label>
i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, P-4200-135 Porto, Portugal;
<email>clara.bento@i3s.up.pt</email>
(C.M.B.);
<email>tania.silva@ibmc.up.pt</email>
(T.S.);
<email>sgomes@ibmc.up.pt</email>
(M.S.G.)</aff>
<aff id="af3-molecules-25-00066">
<label>3</label>
IBMC—Instituto de Biologia Molecular e Celular, Universidade do Porto, P-4200-135 Porto, Portugal</aff>
<aff id="af4-molecules-25-00066">
<label>4</label>
Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, P-1649-028 Lisboa, Portugal;
<email>ana.c.d.pena@gmail.com</email>
(A.C.P.);
<email>lmf@medicina.ulisboa.pt</email>
(L.M.F.)</aff>
<aff id="af5-molecules-25-00066">
<label>5</label>
Ciências Químicas e das Biomoléculas, Escola Superior de Saúde—Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 400, P-4200-072 Porto, Portugal;
<email>cps@estsp.ipp.pt</email>
</aff>
<aff id="af6-molecules-25-00066">
<label>6</label>
ICBAS—Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, P-4050-313 Porto, Portugal</aff>
<author-notes>
<corresp id="c1-molecules-25-00066">
<label>*</label>
Correspondence:
<email>pgomes@fc.up.pt</email>
</corresp>
<fn id="fn1-molecules-25-00066">
<label></label>
<p>These authors contributed equally to this work.</p>
</fn>
</author-notes>
<pub-date pub-type="epub">
<day>24</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="collection">
<month>1</month>
<year>2020</year>
</pub-date>
<volume>25</volume>
<issue>1</issue>
<elocation-id>66</elocation-id>
<history>
<date date-type="received">
<day>28</day>
<month>11</month>
<year>2019</year>
</date>
<date date-type="accepted">
<day>20</day>
<month>12</month>
<year>2019</year>
</date>
</history>
<permissions>
<copyright-statement>© 2019 by the authors.</copyright-statement>
<copyright-year>2019</copyright-year>
<license license-type="open-access">
<license-p>Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>
).</license-p>
</license>
</permissions>
<abstract>
<p>Cinnamic acids are compounds of natural origin that can be found in many different parts of a wide panoply of plants, where they play the most diverse biological roles, often in a conjugated form. For a long time, this has been driving Medicinal Chemists towards the investigation of the therapeutic potential of natural, semi-synthetic, or fully synthetic cinnamic acid conjugates. These efforts have been steadily disclosing promising drug leads, but a wide chemical space remains that deserves to be further explored. Amongst different reported approaches, the combination or conjugation of cinnamic acids with known drugs has been addressed in an attempt to produce either synergistic or multi-target action. In this connection, the present review will focus on efforts of the past decade regarding conjugation with cinnamic acids as a tool for the rescuing or the repurposing of classical antimalarial drugs, and also on future perspectives in this particular field of research.</p>
</abstract>
<kwd-group>
<kwd>amide</kwd>
<kwd>aminoquinoline</kwd>
<kwd>antimalarial</kwd>
<kwd>antioxidant</kwd>
<kwd>antiparasitic</kwd>
<kwd>antiproliferative</kwd>
<kwd>artemisinin</kwd>
<kwd>chloroquine</kwd>
<kwd>cinnamic</kwd>
<kwd>ionic liquid</kwd>
<kwd>primaquine</kwd>
<kwd>rescuing</kwd>
<kwd>repurposing</kwd>
</kwd-group>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="sec1-molecules-25-00066">
<title>1. Introduction</title>
<p>Cinnamic acids (CA,
<bold>1</bold>
in
<xref ref-type="fig" rid="molecules-25-00066-f001">Figure 1</xref>
) and their derivatives occur ubiquitously in the plant kingdom as products of secondary metabolism [
<xref rid="B1-molecules-25-00066" ref-type="bibr">1</xref>
,
<xref rid="B2-molecules-25-00066" ref-type="bibr">2</xref>
,
<xref rid="B3-molecules-25-00066" ref-type="bibr">3</xref>
]. For instance, the simplest natural CA,
<italic>trans</italic>
-cinnamic acid ((2
<italic>E</italic>
)-3-phenylprop-2-enoic acid), can be found in the bark of several tree species from the genus
<italic>Cinnamomum</italic>
[
<xref rid="B1-molecules-25-00066" ref-type="bibr">1</xref>
], or in the resinous exudates of trees from the genus
<italic>Liquidamber</italic>
[
<xref rid="B2-molecules-25-00066" ref-type="bibr">2</xref>
], whereas hydroxycinnamic acids (phenolic acids) like
<italic>p</italic>
-coumaric, caffeic, ferulic, and sinapic acids, as well as derived compounds, are present in many different parts of a wide panoply of plants, including fruits, leaves, flowers, and others [
<xref rid="B1-molecules-25-00066" ref-type="bibr">1</xref>
,
<xref rid="B2-molecules-25-00066" ref-type="bibr">2</xref>
,
<xref rid="B3-molecules-25-00066" ref-type="bibr">3</xref>
,
<xref rid="B4-molecules-25-00066" ref-type="bibr">4</xref>
]. These acids are frequently found in a conjugated form, constituting key building blocks of complex polyphenols, such as acylated derivatives of flavonoid glycosides [
<xref rid="B5-molecules-25-00066" ref-type="bibr">5</xref>
], and they have a number of biological roles in plants, from protection against microbes or other external aggressions to attraction of pollinators, among others [
<xref rid="B1-molecules-25-00066" ref-type="bibr">1</xref>
,
<xref rid="B2-molecules-25-00066" ref-type="bibr">2</xref>
,
<xref rid="B3-molecules-25-00066" ref-type="bibr">3</xref>
,
<xref rid="B4-molecules-25-00066" ref-type="bibr">4</xref>
,
<xref rid="B6-molecules-25-00066" ref-type="bibr">6</xref>
]. Thus, CA and derivatives have long been explored for their potential therapeutic applications, most of which related to their antioxidant, antimicrobial, and antineoplastic properties [
<xref rid="B4-molecules-25-00066" ref-type="bibr">4</xref>
,
<xref rid="B7-molecules-25-00066" ref-type="bibr">7</xref>
,
<xref rid="B8-molecules-25-00066" ref-type="bibr">8</xref>
,
<xref rid="B9-molecules-25-00066" ref-type="bibr">9</xref>
,
<xref rid="B10-molecules-25-00066" ref-type="bibr">10</xref>
,
<xref rid="B11-molecules-25-00066" ref-type="bibr">11</xref>
,
<xref rid="B12-molecules-25-00066" ref-type="bibr">12</xref>
,
<xref rid="B13-molecules-25-00066" ref-type="bibr">13</xref>
,
<xref rid="B14-molecules-25-00066" ref-type="bibr">14</xref>
]. The potential of CA-based compounds as therapeutic agents for other conditions, including Alzheimer’s Disease [
<xref rid="B15-molecules-25-00066" ref-type="bibr">15</xref>
], other nervous system disorders [
<xref rid="B16-molecules-25-00066" ref-type="bibr">16</xref>
,
<xref rid="B17-molecules-25-00066" ref-type="bibr">17</xref>
], acute pain [
<xref rid="B18-molecules-25-00066" ref-type="bibr">18</xref>
], inflammation [
<xref rid="B19-molecules-25-00066" ref-type="bibr">19</xref>
], diabetes [
<xref rid="B20-molecules-25-00066" ref-type="bibr">20</xref>
,
<xref rid="B21-molecules-25-00066" ref-type="bibr">21</xref>
], viral infections [
<xref rid="B22-molecules-25-00066" ref-type="bibr">22</xref>
], tuberculosis [
<xref rid="B23-molecules-25-00066" ref-type="bibr">23</xref>
,
<xref rid="B24-molecules-25-00066" ref-type="bibr">24</xref>
,
<xref rid="B25-molecules-25-00066" ref-type="bibr">25</xref>
,
<xref rid="B26-molecules-25-00066" ref-type="bibr">26</xref>
], and malaria [
<xref rid="B26-molecules-25-00066" ref-type="bibr">26</xref>
,
<xref rid="B27-molecules-25-00066" ref-type="bibr">27</xref>
,
<xref rid="B28-molecules-25-00066" ref-type="bibr">28</xref>
,
<xref rid="B29-molecules-25-00066" ref-type="bibr">29</xref>
], among others, has also been addressed. Depending on their therapeutic targets, different modes of action seem to be exerted by CA and their derivatives or analogues. For instance, interactions with pathogens’ membranes have been associated with the antimicrobial action of CA [
<xref rid="B30-molecules-25-00066" ref-type="bibr">30</xref>
,
<xref rid="B31-molecules-25-00066" ref-type="bibr">31</xref>
,
<xref rid="B32-molecules-25-00066" ref-type="bibr">32</xref>
], whereas anticancer properties of different CA have been related to apoptosis [
<xref rid="B33-molecules-25-00066" ref-type="bibr">33</xref>
,
<xref rid="B34-molecules-25-00066" ref-type="bibr">34</xref>
,
<xref rid="B35-molecules-25-00066" ref-type="bibr">35</xref>
,
<xref rid="B36-molecules-25-00066" ref-type="bibr">36</xref>
,
<xref rid="B37-molecules-25-00066" ref-type="bibr">37</xref>
,
<xref rid="B38-molecules-25-00066" ref-type="bibr">38</xref>
,
<xref rid="B39-molecules-25-00066" ref-type="bibr">39</xref>
], which encompasses various events including “S”-cycle arrest [
<xref rid="B34-molecules-25-00066" ref-type="bibr">34</xref>
], cytoskeleton disruption [
<xref rid="B37-molecules-25-00066" ref-type="bibr">37</xref>
], activation of caspases [
<xref rid="B38-molecules-25-00066" ref-type="bibr">38</xref>
], generation of reactive oxygen species (ROS) [
<xref rid="B35-molecules-25-00066" ref-type="bibr">35</xref>
,
<xref rid="B36-molecules-25-00066" ref-type="bibr">36</xref>
], and inhibition of histone deacetylases [
<xref rid="B33-molecules-25-00066" ref-type="bibr">33</xref>
,
<xref rid="B39-molecules-25-00066" ref-type="bibr">39</xref>
].</p>
<p>Hence, owing to their wide range of biological effects and considerable therapeutic potential, many natural and synthetic CA and their derivatives have been actively pursued by medicinal chemists for the most diverse applications in recent years, as revised by other authors [
<xref rid="B4-molecules-25-00066" ref-type="bibr">4</xref>
,
<xref rid="B9-molecules-25-00066" ref-type="bibr">9</xref>
,
<xref rid="B20-molecules-25-00066" ref-type="bibr">20</xref>
,
<xref rid="B26-molecules-25-00066" ref-type="bibr">26</xref>
]. Amongst different approaches reported in the literature, the combination or conjugation of CA-based compounds with known drugs has been addressed in an attempt to produce either synergistic or multi-target action [
<xref rid="B19-molecules-25-00066" ref-type="bibr">19</xref>
,
<xref rid="B40-molecules-25-00066" ref-type="bibr">40</xref>
,
<xref rid="B41-molecules-25-00066" ref-type="bibr">41</xref>
,
<xref rid="B42-molecules-25-00066" ref-type="bibr">42</xref>
,
<xref rid="B43-molecules-25-00066" ref-type="bibr">43</xref>
]. In this context, the present review will focus on efforts done in the last decade on the conjugation with CA as a way to rescue or repurpose classical antimalarial drugs, and on the future perspectives opened by this particular field of research.</p>
</sec>
<sec id="sec2-molecules-25-00066">
<title>2. Cinnamic Acid Conjugation in the Rescuing of Classical Antimalarial Drugs</title>
<p>The antimalarial potential of cinnamic acid derivatives (CAD) has been anticipated by Kanaani and Ginsburg as early as in 1992, based on the fact that CAD are well-known inhibitors of lactate transport, which is crucial for the survival of intraerythrocytic malaria parasites [
<xref rid="B27-molecules-25-00066" ref-type="bibr">27</xref>
]. Indeed, it has been known for a long time that the production of lactic acid arising from glucose consumption is considerably increased in
<italic>Plasmodium</italic>
-infected erythrocytes (PiRBC), as compared to healthy erythrocytes (hRBC) [
<xref rid="B44-molecules-25-00066" ref-type="bibr">44</xref>
,
<xref rid="B45-molecules-25-00066" ref-type="bibr">45</xref>
]. Hence, the aforementioned authors tested a set of CAD for both their ability to inhibit the growth of intraerythrocytic malaria parasites, and for their effects on solute transport across the host cell membrane and on ATP formation in PiRBC. Interestingly, besides confirming that the tested CAD were able to inhibit parasite growth, it was possible to determine that these compounds hampered the production of ATP by the parasite and inhibited the transport of glucose, glycine, and sorbitol by PiRBC, which was, to an extent, unexpectedly higher than that of lactate transport inhibition [
<xref rid="B27-molecules-25-00066" ref-type="bibr">27</xref>
]. Therefore, this work conveyed the disclosure of CAD as inhibitors of the new permeability pathways (NPP) induced by
<italic>Plasmodium</italic>
in erythrocytes to enable the translocation of carbohydrates and amino acids [
<xref rid="B46-molecules-25-00066" ref-type="bibr">46</xref>
,
<xref rid="B47-molecules-25-00066" ref-type="bibr">47</xref>
,
<xref rid="B48-molecules-25-00066" ref-type="bibr">48</xref>
,
<xref rid="B49-molecules-25-00066" ref-type="bibr">49</xref>
]. Following this pioneering discovery, other authors have proposed different CA-inspired compounds as potential therapeutic agents against malaria [
<xref rid="B26-molecules-25-00066" ref-type="bibr">26</xref>
,
<xref rid="B28-molecules-25-00066" ref-type="bibr">28</xref>
,
<xref rid="B29-molecules-25-00066" ref-type="bibr">29</xref>
], as well as other parasitic diseases [
<xref rid="B50-molecules-25-00066" ref-type="bibr">50</xref>
,
<xref rid="B51-molecules-25-00066" ref-type="bibr">51</xref>
,
<xref rid="B52-molecules-25-00066" ref-type="bibr">52</xref>
]. In view of this, reports have emerged over the past decade where conjugation to CA was proposed as a useful strategy for the rescuing of known antimalarials [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
,
<xref rid="B54-molecules-25-00066" ref-type="bibr">54</xref>
,
<xref rid="B55-molecules-25-00066" ref-type="bibr">55</xref>
]. The structures of these compounds are depicted in
<xref ref-type="fig" rid="molecules-25-00066-f001">Figure 1</xref>
and include from classical agents such as chloroquine (
<bold>2</bold>
), primaquine (
<bold>3</bold>
), or mepacrine (
<bold>4</bold>
), to current first-line drugs like artemisinin (
<bold>5</bold>
). This strategy was hoped to deliver more efficient antimalarials that might be devoid of the resistance, pharmacokinetics, and/or pharmacodynamics liabilities associated with the parent antimalarial drug. Representative examples are addressed in detail in the next sections.</p>
<p>The introduction, in the beginning of the 21st century, of the covalent bitherapy concept by Meunier and co-workers [
<xref rid="B56-molecules-25-00066" ref-type="bibr">56</xref>
,
<xref rid="B57-molecules-25-00066" ref-type="bibr">57</xref>
] gave rise to a wide variety of antimalarial quinoline-based hybrid constructs, as recently reviewed by Aderibigbe and co-workers [
<xref rid="B58-molecules-25-00066" ref-type="bibr">58</xref>
]. Amongst such constructs, conjugates where the 4-amino-7-chloroquinoline core of chloroquine (
<bold>2</bold>
) was combined with different CA (
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
) have been explored by Pérez et al., in the search for dual-action antimalarials [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
,
<xref rid="B54-molecules-25-00066" ref-type="bibr">54</xref>
,
<xref rid="B55-molecules-25-00066" ref-type="bibr">55</xref>
]. Conjugates where the 4-amino-7-chloroquinoline moiety was coupled to CA either directly or through a dipeptide spacer to afford conjugates
<bold>6</bold>
and
<bold>7</bold>
, respectively, were initially synthesized and screened in vitro for their ability to inhibit (i) the growth of intraerythrocytic
<italic>P. falciparum</italic>
parasites, (ii) the hemozoin formation, and (iii) parasite Cys proteases falcipain-2 and -3 [
<xref rid="B55-molecules-25-00066" ref-type="bibr">55</xref>
]. It was found that, in general, conjugate
<bold>6</bold>
, i.e., lacking the dipeptide spacer, were slightly better falcipain inhibitors than their counterparts
<bold>7</bold>
, but were unable to inhibit the formation of hemozoin, and were devoid of antiplasmodial activity (IC
<sub>50</sub>
> 10 μM). In turn, all conjugates
<bold>7</bold>
, i.e., possessing the dipeptide spacer, displayed modest to reasonable antiplasmodial activity (0.8 < IC
<sub>50</sub>
< 10 μM), which did not correlate with their ability to inhibit hemozoin formation, but seemed to consistently increase with the estimated lipophilicity (clog
<italic>P</italic>
values). Also, activity was enhanced by replacing L-amino acids in the spacer by D-amino acids [
<xref rid="B55-molecules-25-00066" ref-type="bibr">55</xref>
].</p>
<p>Based on the above and on in silico data [
<xref rid="B55-molecules-25-00066" ref-type="bibr">55</xref>
], the same authors hypothesized that the replacement of the dipeptide spacer between the aminoquinoline and the CA moieties in compounds
<bold>7</bold>
by more flexible and hydrophobic ones, as in hybrid constructs
<bold>8</bold>
, might improve antiplasmodial activity [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
]. Indeed, compounds
<bold>8</bold>
bearing a butyl spacer (n = 4) were found to display potent in vitro action against the chloroquine-resistant
<italic>P. falciparum</italic>
parasites (11 < IC
<sub>50</sub>
< 111 nM), which were actually comparable to that of the reference first-line drug artemisinin (IC
<sub>50</sub>
= 9.5 nM). The activity displayed was not correlated with the inhibition of either falcipains or hemozoin formation [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
], suggesting that conjugates
<bold>8</bold>
had an alternative/additional mode of action as compared to parent chloroquine. This might be linked to the early reported ability of CAD of inhibiting NPP that are crucial for the viability of intraerythrocytic malaria parasites [
<xref rid="B27-molecules-25-00066" ref-type="bibr">27</xref>
]. A subsequent comprehensive study on a wider set of compounds
<bold>8</bold>
and analogue structures allowed not only to establish important structure-activity relationships (SAR), but also to disclose hybrid conjugates
<bold>8</bold>
as dual-action antimalarial leads, i.e., able to kill in vitro both blood- and liver-stage forms of malaria parasites, an unprecedented finding for chloroquine-based structures [
<xref rid="B54-molecules-25-00066" ref-type="bibr">54</xref>
]. It was also observed that the activity was significantly decreased or even abolished when (i) the 4-amino-7-chloroquinoline core was replaced by other heteroaromatic and non-aromatic cyclic moieties, (ii) the amide bond was replaced by an ester bond, (iii) n was different from 4, (iv) the CA moiety aryl ring was di-substituted, and (iv) substitution of the CA aryl moiety was not in the
<italic>para</italic>
position [
<xref rid="B54-molecules-25-00066" ref-type="bibr">54</xref>
]. The most active compounds were further tested in vivo, and were found to be active when conveniently encapsulated in immunoPEGliposomes targeted at PiRBC [
<xref rid="B59-molecules-25-00066" ref-type="bibr">59</xref>
].</p>
<p>In parallel, Pérez et al. have also explored similar CA conjugates of primaquine (
<bold>3</bold>
), an emblematic 8-aminoquinoline antimalarial drug that is active against liver-stage parasites (including hypnozoites) and also displays transmission blocking activity [
<xref rid="B60-molecules-25-00066" ref-type="bibr">60</xref>
]. The authors anticipated that hybrids
<bold>9</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f003">Figure 3</xref>
) might display multi-stage antimalarial activity, but this hypothesis was not confirmed, as compounds of general formula
<bold>9</bold>
were only active against liver-stage parasites (1.4 < IC
<sub>50</sub>
< 2.4 μM) [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
,
<xref rid="B61-molecules-25-00066" ref-type="bibr">61</xref>
].</p>
<p>Conjugation of primaquine with other CAD has been also pursued by Zorc and co-workers; their research was put towards the repurposing of primaquine for antiviral, antiproliferative and antioxidant applications, and as such will be addressed in the next section. Very recently, the same research group reported that novel primaquine and chloroquine fumardiamides
<bold>10</bold>
and
<bold>11</bold>
, respectively (
<xref ref-type="fig" rid="molecules-25-00066-f004">Figure 4</xref>
), which are structurally similar to CAD conjugates, revealed interesting antiplasmodial activities [
<xref rid="B62-molecules-25-00066" ref-type="bibr">62</xref>
]. In brief, these authors found that primaquine conjugates
<bold>10</bold>
were less cytotoxic and more active (0.11 < IC
<sub>50</sub>
< 0.39 μM) against liver-stage parasites than the parent drug, whereas chloroquine conjugates
<bold>11</bold>
were more active than their primaquine analogues against blood-stage
<italic>P. falciparum</italic>
, the best of which was almost equipotent to chloroquine against the drug-resistant Dd2 strain (0.38 < IC
<sub>50</sub>
< 7.0 μM versus 241 nM for chloroquine), but all were significantly less active than chloroquine against the 3D7 sensitive strain (0.035 < IC
<sub>50</sub>
< 0.19 μM versus 3.7 nM for chloroquine) [
<xref rid="B62-molecules-25-00066" ref-type="bibr">62</xref>
].</p>
<p>The strategy of conjugation to CA in an effort to rescue drugs that are no longer in use as antimalarials has also been applied to mepacrine, or quinacrine (
<bold>4</bold>
), the first synthetic drug developed purposely for malaria [
<xref rid="B63-molecules-25-00066" ref-type="bibr">63</xref>
]. Thus, Gomes and co-workers developed conjugates
<bold>12</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f005">Figure 5</xref>
), whose in vitro activity was assessed against liver-stage
<italic>P. berghei</italic>
parasites and blood-stage
<italic>P. falciparum</italic>
parasites of both a chloroquine-sensitive (3D7) and a chloroquine-resistant (Dd2) strain [
<xref rid="B64-molecules-25-00066" ref-type="bibr">64</xref>
,
<xref rid="B65-molecules-25-00066" ref-type="bibr">65</xref>
]. Relevantly, mepacrine-CA conjugates (
<bold>12</bold>
, where R
<sup>1</sup>
= OMe, R
<sup>2</sup>
= Cl) displayed more potent dual-action activity than their unsubstituted acridine counterparts (
<bold>12</bold>
, where R
<sup>1</sup>
= R
<sup>2</sup>
= H), being 2- to 4-fold more active than the reference primaquine against liver-stage parasites (1.6 < IC
<sub>50</sub>
< 4.9 μM versus 7.5 μM for primaquine), equipotent to chloroquine against blood forms of
<italic>P. falciparum</italic>
3D7 (77 < IC
<sub>50</sub>
< 39 nM versus 21 nM for chloroquine), and 2- to 4-fold more active than chloroquine against blood forms of
<italic>P. falciparum</italic>
Dd2 (29 < IC
<sub>50</sub>
< 131 nM versus 108 nM for chloroquine). Moreover, as compared to the parent mepacrine, some of its CA conjugates were more active and less cytotoxic to human cells [
<xref rid="B64-molecules-25-00066" ref-type="bibr">64</xref>
,
<xref rid="B65-molecules-25-00066" ref-type="bibr">65</xref>
]. The same authors later found that replacing the CA building block by other moieties led to slightly increased cytotoxicity and somewhat decreased activity [
<xref rid="B66-molecules-25-00066" ref-type="bibr">66</xref>
].</p>
<p>The literature offers many other valuable reports on CAD conjugates, which are either addressed in the next section, as they refer to CA-antimalarial drug hybrids aimed at other applications (repurposing of antimalarial drugs), or fall out of scope of the present review by not making use of classical antimalarial drugs as building blocks of the new conjugates. In the latter case, one noteworthy example is that of earlier work by Wiesner et al., who reported interesting in vitro antimalarial activities for conjugates
<bold>13</bold>
and
<bold>14</bold>
[
<xref rid="B29-molecules-25-00066" ref-type="bibr">29</xref>
,
<xref rid="B67-molecules-25-00066" ref-type="bibr">67</xref>
]; these inspired the development of analogues
<bold>15</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f006">Figure 6</xref>
), which displayed nanomolar activity against
<italic>P. falciparum</italic>
Dd2 strain [
<xref rid="B68-molecules-25-00066" ref-type="bibr">68</xref>
].</p>
</sec>
<sec id="sec3-molecules-25-00066">
<title>3. Cinnamic Acids in the Repurposing of Antimalarial Drugs</title>
<p>Investing not only on the rescuing, but also on the repurposing of known drugs, or on the repositioning of yet unapproved active pharmaceutical ingredients (API), benefits from the fact that both the full pharmacokinetic profile and the large-scale production of the API are already known. This greatly reduces the time and cost of translating a new medicine from bench to market, which is particularly interesting either for drugs that, like many antimalarials, are in decline regarding their use for the original indications, or for use in tackling diseases that mainly affect low- to middle-income countries (LMIC) [
<xref rid="B62-molecules-25-00066" ref-type="bibr">62</xref>
]. In this connection, antimalarial drug-CA conjugates, including some of those presented in the previous section, have been explored for other potential therapeutic indications, including cancer and infectious diseases other than malaria, as addressed below.</p>
<sec id="sec3dot1-molecules-25-00066">
<title>3.1. Repurposing Antimalarials for Cancer via Conjugation to Cinnamic Acids</title>
<p>The widely reported anticancer potential of many natural or synthetic CAD [
<xref rid="B9-molecules-25-00066" ref-type="bibr">9</xref>
,
<xref rid="B10-molecules-25-00066" ref-type="bibr">10</xref>
,
<xref rid="B13-molecules-25-00066" ref-type="bibr">13</xref>
,
<xref rid="B33-molecules-25-00066" ref-type="bibr">33</xref>
,
<xref rid="B34-molecules-25-00066" ref-type="bibr">34</xref>
,
<xref rid="B35-molecules-25-00066" ref-type="bibr">35</xref>
,
<xref rid="B36-molecules-25-00066" ref-type="bibr">36</xref>
,
<xref rid="B37-molecules-25-00066" ref-type="bibr">37</xref>
,
<xref rid="B38-molecules-25-00066" ref-type="bibr">38</xref>
,
<xref rid="B39-molecules-25-00066" ref-type="bibr">39</xref>
], and the antiproliferative properties of known antimalarial drugs, like chloroquine (
<bold>2</bold>
) [
<xref rid="B69-molecules-25-00066" ref-type="bibr">69</xref>
] or quinacrine (
<bold>4</bold>
) [
<xref rid="B70-molecules-25-00066" ref-type="bibr">70</xref>
,
<xref rid="B71-molecules-25-00066" ref-type="bibr">71</xref>
], motivated the investigation of CA-antimalarial drug conjugates as anticancer leads. Hence, Pérez et al. have investigated the antiproliferative activity of compounds
<bold>8</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
) on MKN-28 (gastric cancer), Caco-2 (colorectal adenocarcinoma), and MFC-7 (breast cancer) cell lines; all compounds were active in the micromolar range, while being non-toxic to the normal HFF-1 (human foreskin fibroblast) cell line. Activity was greatly reduced or even lost when the aminoquinoline core was replaced by other heterocyclic (aromatic or non-aromatic) moieties, and was generally increased with the length of the alkyl spacer (n in structure
<bold>8</bold>
, see
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
). Moreover, removal of the chlorine atom in the quinoline, or replacement of the amide by an ester bond, led to loss of selectivity [
<xref rid="B72-molecules-25-00066" ref-type="bibr">72</xref>
].</p>
<p>Later on, Gomes et al. assessed the action of mepacrine-CA conjugates
<bold>12</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f005">Figure 5</xref>
) and of analogues where the CA building block was replaced by other acyl moieties, and found that compounds
<bold>12</bold>
were significantly more selective than the parent drug, mepacrine, against the MFC-7 (4.5 < GI
<sub>50</sub>
< 24 μM versus 6.0 μM for mepacrine), Caco-2 (3.8 < GI
<sub>50</sub>
< 35 μM versus 2.4 μM for mepacrine) and, especially, MKN-28 (3.8 < GI
<sub>50</sub>
< 16 μM versus 2.5 μM for mepacrine) cancer cell lines, as compared to normal HFF-1 cells (GI
<sub>50</sub>
> 47 μM versus 11 μM for mepacrine). One of the compounds (
<bold>12</bold>
, where R
<sup>1</sup>
= OMe, R
<sup>2</sup>
= Cl, R =
<italic>p</italic>
-F; see
<xref ref-type="fig" rid="molecules-25-00066-f005">Figure 5</xref>
) stood out for its selective action against the gastric cancer (MKN-28) cells, where the compound is significantly internalized and targets the nucleus, most likely binding to DNA [
<xref rid="B73-molecules-25-00066" ref-type="bibr">73</xref>
].</p>
<p>Zorc and co-workers have developed primaquine-CA conjugates of the amide (
<bold>16</bold>
) and acylsemicarbazide (
<bold>17</bold>
) type (
<xref ref-type="fig" rid="molecules-25-00066-f007">Figure 7</xref>
) that generally presented middle to low micromolar activities against six cancer cell lines (L1210, CEM, HeLa, NCI-H460, SW 620, and MFC-7). The compounds were particularly active against the MFC-7 breast cancer cell line (0.03 < GI
<sub>50</sub>
< 16 μM), with four of the acylsemicarbazides
<bold>17</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f007">Figure 7</xref>
) displaying sub-micromolar activity against these cells. Interestingly, in the case of the most active compound against MFC-7 cells (
<bold>17</bold>
, where R =
<italic>p</italic>
-CF
<sub>3</sub>
), moving the trifluoromethyl group of the CA moiety from the para to the meta position, or having the di-meta substituted analogue instead, leads to a decrease in antiproliferative activity [
<xref rid="B74-molecules-25-00066" ref-type="bibr">74</xref>
]. The same authors have further investigated the mechanism of action of the three most active compounds (
<bold>17</bold>
, where R =
<italic>p</italic>
-CF
<sub>3</sub>
,
<italic>p</italic>
-F, and
<italic>p</italic>
-OMe) against MFC-7 cells to find more dramatic effects for the fluorinated compounds, which likely induce apoptosis involving poly ADP ribose polymerase (PARP) cleavage and caspase-9 activation. These compounds were found to cause morphological changes on MFC-7 cells that are typical of apoptotic effects, and also were found to inhibit the migration and invasion of the cells, i.e., to have anti-metastatic properties [
<xref rid="B75-molecules-25-00066" ref-type="bibr">75</xref>
].</p>
<p>Building on the antiproliferative activity of the antimalarial drug artemisinin (
<bold>5</bold>
) and its derivatives [
<xref rid="B76-molecules-25-00066" ref-type="bibr">76</xref>
,
<xref rid="B77-molecules-25-00066" ref-type="bibr">77</xref>
], Xu et al. have synthesized dihydroartemisinin-CA conjugates
<bold>18</bold>
and
<bold>19</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f008">Figure 8</xref>
), and evaluated their activity against one normal (L-02) and four cancer (PC-3, SGC-7901, A549, and MDA-MB-435) cell lines. One of the conjugates (
<bold>19</bold>
, where R
<sup>1</sup>
= R
<sup>4</sup>
= R
<sup>5</sup>
= H, and R
<sup>2</sup>
= R
<sup>3</sup>
= OMe) was found to have strong and selective activity against the lung cancer cell line A549 (GI
<sub>50</sub>
= 0.20 μM), likely associated with the compound’s ability to induce increased levels of intracellular ferrous ions, and oxidative stress leading to apoptosis [
<xref rid="B78-molecules-25-00066" ref-type="bibr">78</xref>
].</p>
</sec>
<sec id="sec3dot2-molecules-25-00066">
<title>3.2. Repurposing Antimalarials for Other Infections via Conjugation to Cinnamic Acids</title>
<p>Compounds exhibiting antimalarial activity are often screened for their action against other protozoan and protozoan-like pathogens, and antimalarial-CA conjugates make no exception to this rule. Indeed, based on the fact that compounds
<bold>6</bold>
and
<bold>7</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
) were able to inhibit the plasmodial Cys-proteases falcipain-2, Teixeira and co-workers tested those compounds as inhibitors of babesipain-1, the falcipain-2 congener in
<italic>Babesia bigemina</italic>
, which is the causative agent of human and bovine
<italic>Babesia</italic>
. The authors found that the
<italic>para</italic>
-substituted compounds were better inhibitors of babesipain-1 (9.8 < IC
<sub>50</sub>
< 21 μM) than of falcipain-2 in vitro (IC
<sub>50</sub>
> 28 μM), which could be explained by their better fitting into the active binding pockets of the former enzyme, as revealed by molecular docking studies using a homology model of babesipain-1 [
<xref rid="B79-molecules-25-00066" ref-type="bibr">79</xref>
,
<xref rid="B80-molecules-25-00066" ref-type="bibr">80</xref>
].</p>
<p>Based on reported potent antimalarial activity of aminoquinoline-CA conjugates
<bold>8</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
) and
<bold>9</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f003">Figure 3</xref>
), Vale-Costa et al. tested these compounds against
<italic>Leishmania infantum</italic>
parasites [
<xref rid="B81-molecules-25-00066" ref-type="bibr">81</xref>
]. Remarkably, despite antileishmanial activity being more often associated to 8-aminoquinolines, like sitamaquine [
<xref rid="B82-molecules-25-00066" ref-type="bibr">82</xref>
] or tafenoquine [
<xref rid="B83-molecules-25-00066" ref-type="bibr">83</xref>
], conjugates
<bold>8</bold>
, which embed a 4-aminoquinoline moiety, were significantly more active in vitro than the primaquine-derived conjugates
<bold>9</bold>
against promastigotes (3.1 < IC
<sub>50</sub>
< 21 μM for compounds
<bold>8</bold>
versus 16 < IC
<sub>50</sub>
< 53 μM for compounds
<bold>9</bold>
) of
<italic>L. infantum.</italic>
Moreover, compounds
<bold>8</bold>
were comparable (1.2 < IC
<sub>50</sub>
< 9.3 μM) to the reference antileishmanial drug miltefosine (IC
<sub>50</sub>
= 4.1 μM) against intracellular amastigotes, while having low-to-mild toxicity against the mouse bone marrow-derived macrophages [
<xref rid="B81-molecules-25-00066" ref-type="bibr">81</xref>
]. The authors further found that the effect of group R on the activity in the best performing series of compounds
<bold>8</bold>
(n = 4) was not considerable. Still, it was possible to observe a slight decrease in activity in the order: R = H >
<italic>p</italic>
-
<italic>
<sup>i</sup>
</italic>
Pr ≈
<italic>m</italic>
-F >
<italic>p</italic>
-F ≈
<italic>p</italic>
-Cl >
<italic>p</italic>
-OMe. Furthermore, the most potent compound of the set (
<bold>8</bold>
, where n = 4 and R = H) was also the one with the highest selectivity [
<xref rid="B81-molecules-25-00066" ref-type="bibr">81</xref>
]. Interestingly, a recent preliminary screening of the same antimalarial-CA conjugates
<bold>8</bold>
and
<bold>9</bold>
, as well as of conjugates
<bold>12</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f005">Figure 5</xref>
) against another kinetoplastid pathogen,
<italic>Trypanosoma brucei brucei</italic>
, is offering a somewhat different picture: while most of the compounds are also significantly active against this parasite, they are not as potent as the reference drug suramin [
<xref rid="B84-molecules-25-00066" ref-type="bibr">84</xref>
]. Moreover, structure-activity relationships seem to follow a different trend as compared to antileishmanial activity; the most active conjugates against
<italic>T. brucei brucei</italic>
, which reduce parasite viability to 2% or even less at 10 μM, invariably have R =
<italic>p</italic>
-
<italic>
<sup>i</sup>
</italic>
Pr, regardless of belonging to the chloroquine (
<bold>8</bold>
), primaquine (
<bold>9</bold>
), or acridine (
<bold>12</bold>
) series [
<xref rid="B84-molecules-25-00066" ref-type="bibr">84</xref>
]. These are noteworthy findings that are being further investigated by us.</p>
<p>Recently, antimalarial-CA conjugates
<bold>8</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
),
<bold>9</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f003">Figure 3</xref>
), and
<bold>12</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f005">Figure 5</xref>
) were also evaluated for their activity against the opportunistic lung pathogens of the
<italic>Pneumocystis</italic>
genus [
<xref rid="B85-molecules-25-00066" ref-type="bibr">85</xref>
] based on the widely reported susceptibility of these pathogens to antiprotozoan medicines, including primaquine, atovaquone, and the trimethoprim-sulfamethoxazole combination [
<xref rid="B86-molecules-25-00066" ref-type="bibr">86</xref>
,
<xref rid="B87-molecules-25-00066" ref-type="bibr">87</xref>
]. This study revealed that chloroquine-related conjugates
<bold>8</bold>
(1.4 < IC
<sub>50</sub>
< 5.8 μM) were more potent than their primaquine counterparts
<bold>9</bold>
(IC
<sub>50</sub>
> 35 μM), although primaquine is known for its anti-
<italic>Pneumocystis</italic>
activity, whereas chloroquine is not. Interestingly, while no clear correlations were found between the stereoelectronic properties of substituent R in conjugates
<bold>8</bold>
and their antimalarial [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
,
<xref rid="B54-molecules-25-00066" ref-type="bibr">54</xref>
] or antileishmanial [
<xref rid="B81-molecules-25-00066" ref-type="bibr">81</xref>
] activities, their anti-
<italic>Pneumocystis</italic>
activity increased with the electrodonating character (Hammet constant σ
<sub>para</sub>
) of the substituent R in
<italic>para</italic>
-position. Overall, according to the authors, these findings disclose compounds
<bold>8</bold>
as a relevant family of antimalarial drug-CA conjugates worthy of further investigation, especially when taking into account their potent activity against infective agents on which their respective building blocks alone, i.e., chloroquine and CA, have not a particularly strong action [
<xref rid="B85-molecules-25-00066" ref-type="bibr">85</xref>
].</p>
</sec>
</sec>
<sec id="sec4-molecules-25-00066">
<title>4. New Trends and Future Directions</title>
<p>In recent years, multiple reports have emerged highlighting the potential of ionic liquids (IL) derived from API (API-IL) as a promising approach to produce new drug formulations. API-IL can preserve or even improve the therapeutic action of the original API, while offering advantageous physico-chemical properties, i.e., higher solubility and low or no polymorphism, as compared to classical solid salts of the API [
<xref rid="B88-molecules-25-00066" ref-type="bibr">88</xref>
,
<xref rid="B89-molecules-25-00066" ref-type="bibr">89</xref>
,
<xref rid="B90-molecules-25-00066" ref-type="bibr">90</xref>
,
<xref rid="B91-molecules-25-00066" ref-type="bibr">91</xref>
]. Based on this, Ferraz et al. have investigated the therapeutic potential of new API-IL produced by an acid-base combination of CA with the basic antimalarials chloroquine and primaquine (compounds
<bold>20</bold>
and
<bold>21</bold>
,
<xref ref-type="fig" rid="molecules-25-00066-f009">Figure 9</xref>
). In other words, compounds
<bold>20</bold>
and
<bold>21</bold>
can be regarded as ionic surrogates of the antimalarial drug-CA covalent (amide) conjugates
<bold>8</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f002">Figure 2</xref>
) and
<bold>9</bold>
(
<xref ref-type="fig" rid="molecules-25-00066-f003">Figure 3</xref>
), respectively [
<xref rid="B85-molecules-25-00066" ref-type="bibr">85</xref>
,
<xref rid="B92-molecules-25-00066" ref-type="bibr">92</xref>
,
<xref rid="B93-molecules-25-00066" ref-type="bibr">93</xref>
,
<xref rid="B94-molecules-25-00066" ref-type="bibr">94</xref>
]. Compounds
<bold>20</bold>
and
<bold>21</bold>
were all produced in quantitative yield by acid-base titration of a methanolic solution of the antimalarial drug with a methanolic solution of the CA, and were all liquids at room temperature, hence, classifiable as room-temperature ionic liquids (RTIL). Complete transfer of the acidic proton from the CA building block to the antimalarial aminoquinoline was confirmed by proton nuclear magnetic resonance (
<sup>1</sup>
H-NMR) [
<xref rid="B92-molecules-25-00066" ref-type="bibr">92</xref>
].</p>
<p>Remarkably, the primaquine-derived RTIL
<bold>21</bold>
were found not only to preserve or even slightly improve the in vitro activity of the parent antimalarial against liver-stage
<italic>P. berghei</italic>
parasites and stage V gametocytes of
<italic>P. falciparum</italic>
, but also to cause a 4-fold increase in activity against the blood-stage (0.94 < IC
<sub>50</sub>
< 3.4 μM and 0.69 < IC
<sub>50</sub>
< 1.4 μM for 3D7 and Dd2 strains, respectively), as compared to primaquine (IC
<sub>50</sub>
= 6.1 and 4.7 μM, for 3D7 and Dd2 strains, respectively) [
<xref rid="B92-molecules-25-00066" ref-type="bibr">92</xref>
]. The same authors have later hypothesized that such an increase might be due to a better interaction of the RTIL with the membranes of PiRBC, based on biophysical studies using model membranes [
<xref rid="B93-molecules-25-00066" ref-type="bibr">93</xref>
]. In turn, the chloroquine-derived RTIL
<bold>20</bold>
were unable to outshine the liver- or blood-stage activity of either the reference drugs for these stages, or their covalent analogues
<bold>8</bold>
[
<xref rid="B94-molecules-25-00066" ref-type="bibr">94</xref>
]. Interestingly, both RTIL
<bold>20</bold>
and
<bold>21</bold>
were equipotent to their parent antimalarials, or to their covalent analogues,
<bold>8</bold>
and
<bold>9</bold>
, respectively, against
<italic>Pneumocystis carinii</italic>
[
<xref rid="B93-molecules-25-00066" ref-type="bibr">93</xref>
].</p>
<p>The above results, and the recent reports on the potential benefits of developing ionic liquid-based formulations for old problematic drugs [
<xref rid="B95-molecules-25-00066" ref-type="bibr">95</xref>
,
<xref rid="B96-molecules-25-00066" ref-type="bibr">96</xref>
] places API-IL in the top list of new trends in pharmaceutical design and technology. It has major advantage in regards to solubility improvement, which may contribute to both better pharmacokinetics, and lower toxicity. Indeed, we have very recently observed that, while chloroquine-CA covalent conjugates
<bold>8</bold>
are highly toxic for bone marrow-derived macrophages (BMM), their RTIL counterparts
<bold>20</bold>
are not, which might be related to the fact that the former, but not the latter, tend to crystallize in BMM cell cultures (
<xref ref-type="fig" rid="molecules-25-00066-f010">Figure 10</xref>
) [
<xref rid="B97-molecules-25-00066" ref-type="bibr">97</xref>
].</p>
<p>As ionic liquids result from the combination of an acid with an organic base, the mixing of an acidic drug with a basic one is likely to deliver dual-action API-IL based formulations, such as the lidocaine-ibuprofen IL reported by Park and Prausnitz [
<xref rid="B98-molecules-25-00066" ref-type="bibr">98</xref>
], amongst other synergistic IL-based formulations for transdermal delivery, as recently reviewed by Pillay and co-workers [
<xref rid="B99-molecules-25-00066" ref-type="bibr">99</xref>
]. Hence, by virtue of their diverse biological roles and of their acidic nature, CA may offer multiple options for the design of novel API-IL upon their ionic pairing with basic API for different kinds of therapeutic indications. In this connection, given that malaria and other infectious diseases are mostly addressed by the use of basic drugs, acid-base combination of these drugs with CA encloses the potential to deliver very interesting formulations in the near future. This is of the utmost importance, considering that drug-resistant infections are becoming the biggest health threat of our times [
<xref rid="B100-molecules-25-00066" ref-type="bibr">100</xref>
].</p>
<p>Still, new trends in pharmaceutical technology, as in the above example of API-IL, do not and should not empty the interest on more standard approaches. Indeed, the cases herein reviewed, where the conjugation of CA to classical antimalarial drugs was proven as a valuable strategy to either rescue or repurpose those drugs, highlight the immense chemical space that remains to be explored and likely encloses considerable therapeutic potential. Data thus far gathered on the different antimalarial drug-CA conjugates herein presented give excellent prospects on the promise enclosed by these and similar compounds for many therapeutic indications, both for and beyond parasitic infections.</p>
</sec>
<sec sec-type="conclusions" id="sec5-molecules-25-00066">
<title>5. Conclusions</title>
<p>Cinnamic acids are rarely found in nature in uncombined forms, and their natural derivatives or conjugates are widely known for their biological ubiquity and diversity of functions. For a long time, this has been inspiring medicinal chemists to explore the therapeutic potential of cinnamic acid derivatives, either of natural, semi-synthetic, or fully synthetic origin. These efforts have been steadily disclosing new cinnamic acid-based molecules as promising drug leads, of which those that embed an antimalarial drug moiety, as herein reviewed, are only a very minor and largely unexplored part. This highlights the huge opportunities that are yet to be offered by these remarkable multi-task molecules, which are undeniably worthy of being pursued in the near future.</p>
</sec>
</body>
<back>
<notes>
<title>Author Contributions</title>
<p>Conceptualization, M.S.G., C.T., and P.G.; methodology, A.C.P., L.M.F., L.A., and T.S.; investigation, A.T.S., C.M.B., A.C.P., L.M.F., L.A., and T.S.; data curation, A.T.S., C.M.B., A.C.P., L.M.F., L.A., and T.S.; writing—original draft preparation, A.T.S., and C.M.B.; writing—review and editing, T.S., M.S.G., C.T. and P.G.; supervision, L.M.F., C.P., T.S., M.S.G., C.T., P.G.; funding acquisition, R.F., M.S.G., C.T., P.G. All authors have read and agreed to the published version of the manuscript.</p>
</notes>
<notes>
<title>Funding</title>
<p>This research was funded by Fundação para a Ciência e Tecnologia (FCT), Portugal, grants UID/QUI/50006/2019, and PTDC/BTM-SAL/29786/2017.</p>
</notes>
<notes notes-type="COI-statement">
<title>Conflicts of Interest</title>
<p>The authors declare no conflict of interest.</p>
</notes>
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<floats-group>
<fig id="molecules-25-00066-f001" orientation="portrait" position="float">
<label>Figure 1</label>
<caption>
<p>General structure of cinnamic acids (
<bold>1</bold>
) and structures of the antimalarial drugs chloroquine (
<bold>2</bold>
), primaquine (
<bold>3</bold>
), mepacrine (
<bold>4</bold>
), and artemisinin (
<bold>5</bold>
).</p>
</caption>
<graphic xlink:href="molecules-25-00066-g001"></graphic>
</fig>
<fig id="molecules-25-00066-f002" orientation="portrait" position="float">
<label>Figure 2</label>
<caption>
<p>Chloroquine-cinnamic acid conjugates developed by Pérez et al. [
<xref rid="B53-molecules-25-00066" ref-type="bibr">53</xref>
,
<xref rid="B54-molecules-25-00066" ref-type="bibr">54</xref>
,
<xref rid="B55-molecules-25-00066" ref-type="bibr">55</xref>
,
<xref rid="B59-molecules-25-00066" ref-type="bibr">59</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g002"></graphic>
</fig>
<fig id="molecules-25-00066-f003" orientation="portrait" position="float">
<label>Figure 3</label>
<caption>
<p>Primaquine-cinnamic acid conjugates proposed by Pérez et al. [
<xref rid="B61-molecules-25-00066" ref-type="bibr">61</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g003"></graphic>
</fig>
<fig id="molecules-25-00066-f004" orientation="portrait" position="float">
<label>Figure 4</label>
<caption>
<p>Primaquine and chloroquine fumardiamides reported by Zorc and co-workers [
<xref rid="B62-molecules-25-00066" ref-type="bibr">62</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g004"></graphic>
</fig>
<fig id="molecules-25-00066-f005" orientation="portrait" position="float">
<label>Figure 5</label>
<caption>
<p>9-aminoacridine-cinnamic acid conjugates developed by Gomes and co-workers [
<xref rid="B64-molecules-25-00066" ref-type="bibr">64</xref>
,
<xref rid="B65-molecules-25-00066" ref-type="bibr">65</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g005"></graphic>
</fig>
<fig id="molecules-25-00066-f006" orientation="portrait" position="float">
<label>Figure 6</label>
<caption>
<p>Antimalarial-cinnamic acid conjugates and analogues reported by Wiesner et al. [
<xref rid="B29-molecules-25-00066" ref-type="bibr">29</xref>
,
<xref rid="B67-molecules-25-00066" ref-type="bibr">67</xref>
,
<xref rid="B68-molecules-25-00066" ref-type="bibr">68</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g006"></graphic>
</fig>
<fig id="molecules-25-00066-f007" orientation="portrait" position="float">
<label>Figure 7</label>
<caption>
<p>Antiproliferative primaquine-CA conjugates developed by Zorc et al. [
<xref rid="B74-molecules-25-00066" ref-type="bibr">74</xref>
,
<xref rid="B75-molecules-25-00066" ref-type="bibr">75</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g007"></graphic>
</fig>
<fig id="molecules-25-00066-f008" orientation="portrait" position="float">
<label>Figure 8</label>
<caption>
<p>Antiproliferative dihydroartemisinin-CA conjugates developed by Xu et al. [
<xref rid="B78-molecules-25-00066" ref-type="bibr">78</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g008"></graphic>
</fig>
<fig id="molecules-25-00066-f009" orientation="portrait" position="float">
<label>Figure 9</label>
<caption>
<p>Antimalarial drug-cinnamic acid ionic liquids developed by Ferraz et al. [
<xref rid="B85-molecules-25-00066" ref-type="bibr">85</xref>
,
<xref rid="B92-molecules-25-00066" ref-type="bibr">92</xref>
,
<xref rid="B93-molecules-25-00066" ref-type="bibr">93</xref>
,
<xref rid="B94-molecules-25-00066" ref-type="bibr">94</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g009"></graphic>
</fig>
<fig id="molecules-25-00066-f010" orientation="portrait" position="float">
<label>Figure 10</label>
<caption>
<p>(
<bold>A</bold>
) Representative bright field images (Leica DMI6000 microscope, scale bar 30 μm) of BALB/c mice bone marrow-derived macrophages (BMM) incubated with either a covalent chloroquine-CA conjugate
<bold>8</bold>
(n = 4, R =
<italic>p</italic>
-Me)—left, or its surrogate ionic liquid
<bold>20</bold>
—right, at 100 μM (upper panel) or at 12.5 (
<bold>8</bold>
) and 18.75 (
<bold>20</bold>
) μM (lower panel). (
<bold>B</bold>
) Cytotoxicity for BMM was determined in parallel by the resazurin reduction assay (average ± SD) in three independent experiments. The abrupt decrease in macrophage viability above 12.5 μM is probably related to the crystallization of the compound observed for
<bold>8</bold>
, and not for
<bold>20</bold>
[
<xref rid="B97-molecules-25-00066" ref-type="bibr">97</xref>
].</p>
</caption>
<graphic xlink:href="molecules-25-00066-g010"></graphic>
</fig>
</floats-group>
</pmc>
</record>

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