Stereochemical studies were performed on asymmetric [2, 3] sigmatropic rearrangements of sulfur ylides derived from chiral ketenimines possessing various kinds of substituents and prochiral sulfur ylides. A mechanistic pathway for these rearrangements is proposed on the basis of the stereochemical results obtained. New asymmetric centers are induced on the sulfur atoms of the ylides during the reactions.
对来源于具有各种取代基的手性
酮亚胺和前手性
硫烯盐的非对称 [2, 3] sigma-三角重排进行了立体
化学研究。根据获得的立体
化学结果,提出了这些重排的机理路径。在反应过程中,
硫烯盐上的
硫原子上诱导产生新的不对称中心。