then rearranged into the corresponding optically active 3-phospholene oxides upon heating. After a screening of chiral auxiliaries and the optimization of the reaction conditions, several scalemic 1-aryl- or 1-alkyl-3-methyl-3-phospholene oxides were prepared in excellent yields and with ee-s up to 35%. The key steps of this resolution were investigated by quantum chemical calculations to get some insights
阐述了一种基于形成共价非对映中间体的动态动力学拆分方法,以制备对映体富集的1-取代-3-甲基-3-氧化膦。首先将3-环氧
丙烷氧化物转化为相应的
氯-3-
磷鎓
氯化物。
氯磷鎓盐的对映异构体之间的动态相互转化已通过实验验证,因为这是动态拆分的关键步骤。使环状
氯代
磷鎓盐与带有羟基官能团的手性助剂反应,以不等量形成相应的非对映体烷氧基
磷鎓盐。然后在加热时将非对映异构物质重新排列成相应的旋光的3-氧化茂氧化物。在筛选了手性助剂并优化了反应条件后,以极高的收率和高达35%的ee制备了几种规模的1-芳基-或1-烷基-3-甲基-3-膦基环氧
丙烷。通过量子
化学计算研究了该分辨率的关键步骤,以深入了解造成立体选择的因素。