Asymmetric alkylation of carboxyamides by using trans-2,5-disubstituted pyrrolidines as chiral auxiliaries
作者:Yasuhiro Kawanami、Yoshio Ito、Toshiyuki Kitagawa、Yoshiyuki Taniguchi、Tsutomu Katsuki、Masaru Yamaguchi
DOI:10.1016/s0040-4039(01)80046-0
日期:1984.1
trans-2,5-Bis(methoxymethyl)- and trans-2,5-bis(methoxymethoxymethyl)pyrrolidines proved to be excellent chiral auxiliaries for the asymmetric alkylation of the corresponding carboxyamide enolates giving good chemical yield and high stereoselectivity (invariably over 95% de), with remarkable flexibility to substrates and reaction conditions.
反式-2,5-双(甲氧基甲基)-和反式-2,5-双(甲氧基甲氧基甲基)吡咯烷酮是出色的手性助剂,用于相应的羧酰胺烯酸酯的不对称烷基化,具有良好的化学收率和较高的立体选择性(始终超过95% de),对底物和反应条件具有显着的灵活性。