Reaction of α-(<i>N</i>-Carbamoyl)alkylcuprates with Enantioenriched Propargyl Electrophiles: Synthesis of Enantioenriched 3-Pyrrolines
作者:R. Karl Dieter、Ningyi Chen、Vinayak K. Gore
DOI:10.1021/jo061442h
日期:2006.11.1
Enantioenriched propargyl mesylates or perfluorobenzoates react with α-(N-carbamoyl)alkylcuprates to afford scalemic α-(N-carbamoyl) allenes which undergo N-Boc deprotection and AgNO3-promoted cyclization to afford N-alkyl-3-pyrrolines. The synthetic sequence proceeds under optimal conditions with no loss of enantiopurity relative to the starting propargyl alcohols prepared by asymmetric addition of
富含对映体的炔丙基甲磺酸酯或全氟苯甲酸酯与α-(N-氨基甲酰基)烷基铜酸酯反应,得到规模化的α-(N-氨基甲酰基)丙二烯,对其进行N -Boc脱保护和AgNO 3促进的环化,得到N-烷基-3-吡咯啉。相对于通过将末端炔烃不对称加成到醛中而制备的起始炔丙醇,合成序列在最佳条件下进行而对映体纯度没有损失。