Katagiri K, Komagawa S, Uchiyama M, Yamaguchi K, Azumaya I. Control of a Chiral Property of a Calix[3]aramide: The Racemization Suppressed by Intramolecular Cyclic Hydrogen Bonds and DMSO-H2O System-Induced Spontaneous Resolution.
Org Lett 2015;
17:3650-3. [PMID:
26186403 DOI:
10.1021/acs.orglett.5b01455]
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Abstract
A calix[3]aramide has been synthesized bearing three triphenylphosphinic amide moieties, which formed intramolecular cyclic hydrogen bonds that suppressed its cone/partial cone inversion. The intramolecular cyclic hydrogen bonds were disrupted by DMSO, and the insertion of H2O into the hydrogen bonds triggered the spontaneous resolution of the calix[3]aramide. Within a chiral environment, such as that afforded by the presence of optically active 2-butanol, the calix[3]aramide underwent a symmetry breaking crystallization process.
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