Diastereoselective and enantioselective synthesis of 1,2-disubstituted cycloalkanecarboxaldehydes
作者:Hiroshi Kogen、Kiyoshi Tomioka、Shun-Ichi Hashimoto、Kenji Koga
DOI:10.1016/s0040-4020(01)93269-7
日期:——
quaternary carbon atoms in vicinal positions in their rings, is devised starting from cycloalkenecarboxal-dehydes (5) t-Leucine t-butyl ester (2, R=But), a highly effective chiral auxiliary reagent in the present method, can be recovered for recycling without any loss of optical purity Some mechanistic explanations on the stereochemical courses of the reactions are presented
对于非对映选择性和对映选择性合成一个非常有用的方法反式-和顺-1,2-二取代cycloalkanecarboxaldehydes(反式-和顺式- 10),有用的手性合成子具有非对称叔和在其环的邻位位置上的季碳原子,被设计出发可以从本方法中的高效手性助剂-环烯烃羧醛(5)叔亮氨酸叔丁酯(2,R = Bu t)中回收而无需光学纯度损失。介绍了反应的立体化学过程