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Improved design of inherently chiral calix[4]arenes as organocatalysts†
Seiji Shirakawa,Shoichi Shimizu
New Journal of Chemistry Pub Date : 03/18/2010 00:00:00 , DOI:10.1039/B9NJ00685K
Abstract

Improvement of the design of inherently chiral calix[4]arenes as organocatalysts was accomplished via the introduction of a diarylmethanol structure. Novel, inherently chiral calix[4]arenes bearing a tertiary amine or a quaternary ammonium moiety, together with a diarylmethanol moiety, were synthesized from previously reported chiral calix[4]arene amino acid derivatives in an optically pure form. These chiral calix[4]arenes were applied to asymmetric reactions as organocatalysts, and a positive effect of the diarylmethanol structure on enantioselectivity was observed.

Graphical abstract: Improved design of inherently chiral calix[4]arenes as organocatalysts
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