Asymmetric aldol and alkylation reactions mediated by the “quat” chiral auxiliary (R)-(−)-5-methyl-3,3-dimethyl-2-pyrrolidinone
作者:Stephen G. Davies、Gilles J.-M. Doisneau、Jeremy C. Prodger、Hitesh J. Sanganee
DOI:10.1016/0040-4039(94)85223-5
日期:1994.4
Enolates derived from the N-propionoyl derivative of the “quat” chiral auxiliary (R)-(−)-5-methyl-3,3-dimethyl-2-pyrrolidinone undergo highly stereoselective aldol and alkylation reactions. Removal of the auxiliary has been demonstrated with LiOH, PhCH2OLi, MeOMgBr and LiAlH4 to generate respectively (2R,3R)-3-hydroxy-2-methyl-3-phenylpropionic acid in homochiral form, and with 96% e.e. (S)-2-meth
衍生自“季铵盐”手性助剂(R)-(-)-5-甲基-3,3-二甲基-2-吡咯烷酮的N-丙酰衍生物的烯醇酸酯经历高度立体选择性的羟醛和烷基化反应。已证明可以用LiOH,PhCH 2 OLi,MeOMgBr和LiAlH 4除去助剂,分别生成纯手性形式的(2 R,3 R)-3-羟基-2-甲基-3-苯基丙酸和96%ee (S)-2-甲基-3-苯基丙酸和衍生的甲基和苄基酯,且具有> 94%ee(S)-2-甲基-3-苯基丙醇。