The nature of the O-protecting group is crucial to obtain, in terms of diastereoselectivity and chemical yields, the best results. An ab initio molecular orbital study on 2-silyloxy propanal and MM2 studies on 2-alkoxy propanal show the existence of stable cyclic and acyclic conformers, which are presumably responsible for the high syn diastereoselectivity observed in the addition of non-metal carrying
从手性醛开始已经获得了经由有机
亚磷酸酯对醛的不对称膦酰化进行立体控制。就非对映选择性和
化学产率而言,O-保护基团的性质对于获得最佳结果至关重要。一个从头算分子轨道研究2甲
硅烷氧基
丙醛和MM2研究上的2-烷氧基
丙醛显示稳定环状和无环的构象,这大概是负责高的存在顺式在加入非承载的
金属
亚磷酸酯的非对映选择性观察。