Stereochemical aspects of the asymmetric synthesis of chiral α,β-dihydroxy phosphonates. Synthesis of α,β-dihydroxy phosphonic acids
作者:Alessandro Bongini、Roberto Camerini、Mauro Panunzio、Elisa Bandini、Giorgio Martelli、Giuseppe Spunta
DOI:10.1016/s0957-4166(96)00456-9
日期:1996.12
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。