Pd-catalyzed asymmetric allylic alkylation of 2-substituted cycloalkenyl carbonates using a chiral diaminophosphine oxide: (S,RP)-Ph-DIAPHOX
作者:Long Jin、Tetsuhiro Nemoto、Hiroshi Nakamura、Yasumasa Hamada
DOI:10.1016/j.tetasy.2008.03.027
日期:2008.5
A Pd-catalyzed asymmetric allylic alkylation of 2-substituted cycloalkenyl carbonates using a chiral diaminophosphine oxide is described. Asymmetric allylic substitution of various cyclic substrates proceeded using 5 mol % of Pd catalyst, 10 mol % of (S,RP)-Ph-DIAPHOX 1, 10 mol % of LiOAc, and N,O-bis(trimethylsilyl)acetamide (BSA), to afford the corresponding products in excellent yields with up to
描述了使用手性二氨基膦氧化物的Pd催化的2-取代的环烯基碳酸酯的不对称烯丙基烷基化。各种环状基板的不对称烯丙位取代,使用5摩尔%的Pd的催化剂,10摩尔%(的进行小号,- [R P)-Ph-DIAPHOX 1,10摩尔%的LiOAc,和Ñ,ö双(三甲基硅烷基)乙酰胺(BSA ),以高达92%ee的高收率提供相应的产品。