Enantioselective Cyanosilylation of Ketones Catalyzed by a Nitrogen-Containing Bifunctional Catalyst
作者:Yan Xiong、Xiao Huang、Shaohua Gou、Jinglun Huang、Yuehong Wen、Xiaoming Feng
DOI:10.1002/adsc.200505418
日期:2006.3
An efficient and optically active, bifunctional tetraaza ligand (2S)-N-(1R,2R)-2-[(S)-pyrrolidine-2-carboxamido]-1,2-diphenylethyl}pyrrolidine-2-carboxamide has been developed for the addition of trimethylsilyl cyanide (TMSCN) to ketones. The bifunctional catalyst system based on a monometallic titanium complex was found to be a highly enantioselective catalyst to provide O-TMS cyanohydrins with up
一种高效且旋光的双官能四氮杂配体(2 S)-N -(1 R,2 R)-2-[(S)-吡咯烷-2-甲酰胺基] -1,2-二苯乙基}吡咯烷-2-甲酰胺已经开发出将三甲基甲硅烷基氰化物(TMSCN)添加到酮中的方法。发现基于单金属钛配合物的双官能催化剂体系是高度对映选择性的催化剂,其提供高达94%ee的O -TMS氰醇。已经提出了一种可能的过渡态来解释激活和不对称电感的起源。