Asymmetric aza-[2,3]-Wittig sigmatropic rearrangements: chiral auxiliary control and formal asymmetric synthesis of (2S, 3R, 4R)-4-hydroxy-3-methylproline and (−)-kainic acid†
Abstract
A survey of 16 different chiral auxiliaries and a variety of strategies found that an (−)-8-phenylmenthol ester of a