Asymmetric darzens condensation of ketones with α-chloroacetates by means of (–)-8-phenylmenthyl auxiliary
作者:Katsuo Ohkata、Jyunji Kimura、Yoshihiro Shinohara、Ryukichi Takagi、Yoshikazu Hiraga
DOI:10.1039/cc9960002411
日期:——
The Darzens condensation of symmetric and unsymmetric ketones with (-)-8-phenylmenthyl alpha-chloroacetate diastereoselectively affords glycidic esters in 77-94% de; the stereochemistry [(2R,3R) configuration] of the product is understandable in terms of pi-pi interaction in the open transition state model.