Synthesis and antimalarial activity of new amino analogues of amodiaquine.
Identifieur interne : 000223 ( Hal/Curation ); précédent : 000222; suivant : 000224Synthesis and antimalarial activity of new amino analogues of amodiaquine.
Auteurs : E. Paunescu [France] ; Sophie Susplugas [France] ; E. Boll ; R. Varga ; Elisabeth Mouray [France] ; Philippe Grellier [France] ; Patricia Melnyk [France]Source :
- Medicinal Chemistry [ 1573-4064 ] ; 2008.
Abstract
Amodiaquine remains one of the most prescribed antimalarial 4-aminoquinoline. To assess the importance of the 4'-hydroxyl group and subsequent hydrogen bond in the antimalarial activity of amodiaquine (AQ), a series of new analogues in which this functionality was replaced by various amino groups was synthesized. The incorporation of a 3'-pyrrolidinamino group instead of the 3'-diethylamino function of AQ allowed the development of a parallel series of amopyroquine derivatives. The compounds were screened against both chloroquine (CQ)-sensitive and -resistant strains of Plasmodium falciparum and their cytotoxicity evaluated upon the MRC5 cell line. Antimalarial activity in a low nanomolar range was recorded showing that the 4'-hydroxy function can be successfully replaced by various amino substituents in terms of activity without any influence of the level of CQ-resistance of the strains. Furthermore the ability of the compounds to inhibit beta-hematin formation was measured in order to discuss the mechanism of action of these new compounds. Compounds 7d and 8d exhibit a high selectivity index and may be considered as promising leads for further development.
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DOI: 10.2174/157340608785700153
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<abstract xml:lang="en"> <p>Amodiaquine remains one of the most prescribed antimalarial 4-aminoquinoline. To assess the importance of the 4'-hydroxyl group and subsequent hydrogen bond in the antimalarial activity of amodiaquine (AQ), a series of new analogues in which this functionality was replaced by various amino groups was synthesized. The incorporation of a 3'-pyrrolidinamino group instead of the 3'-diethylamino function of AQ allowed the development of a parallel series of amopyroquine derivatives. The compounds were screened against both chloroquine (CQ)-sensitive and -resistant strains of Plasmodium falciparum and their cytotoxicity evaluated upon the MRC5 cell line. Antimalarial activity in a low nanomolar range was recorded showing that the 4'-hydroxy function can be successfully replaced by various amino substituents in terms of activity without any influence of the level of CQ-resistance of the strains. Furthermore the ability of the compounds to inhibit beta-hematin formation was measured in order to discuss the mechanism of action of these new compounds. Compounds 7d and 8d exhibit a high selectivity index and may be considered as promising leads for further development.</p>
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