Synthesis and conformational study of the first triply bridged calix[6]azatubes.
Identifieur interne : 000C89 ( France/Analysis ); précédent : 000C88; suivant : 000C90Synthesis and conformational study of the first triply bridged calix[6]azatubes.
Auteurs : Stéphane Le Gac [France] ; Xianshun Zeng ; Olivia Reinaud ; Ivan JabinSource :
- The Journal of organic chemistry [ 0022-3263 ] ; 2005.
Abstract
[reaction: see text] The first C(3)(v)- and D(3)(h)-symmetrical triply bridged calix[6]azatubes were prepared in good yields from the known 1,3,5-tris-methylated calix[6]arene through an efficient [1 + 1] macrocyclization reaction. A remarkably regioselective hexa ipso-nitration reaction led to a calix[6]azatube substituted at the wide rim in alternate position by tBu and nitro groups. A (1)H NMR study showed that, whereas the parent bis-calix[6]arenes self-include their methoxy groups, thereby closing their inner tube, the nitro-substituted calix[6]azatube undergoes a conformational change with the expulsion of the methoxy groups, hence presenting a three-dimensional structure open for host-guest applications.
DOI: 10.1021/jo048137l
PubMed: 15704952
Affiliations:
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pubmed:15704952Le document en format XML
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<front><div type="abstract" xml:lang="en">[reaction: see text] The first C(3)(v)- and D(3)(h)-symmetrical triply bridged calix[6]azatubes were prepared in good yields from the known 1,3,5-tris-methylated calix[6]arene through an efficient [1 + 1] macrocyclization reaction. A remarkably regioselective hexa ipso-nitration reaction led to a calix[6]azatube substituted at the wide rim in alternate position by tBu and nitro groups. A (1)H NMR study showed that, whereas the parent bis-calix[6]arenes self-include their methoxy groups, thereby closing their inner tube, the nitro-substituted calix[6]azatube undergoes a conformational change with the expulsion of the methoxy groups, hence presenting a three-dimensional structure open for host-guest applications.</div>
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