Catalytic Asymmetric Synthesis of Alkyl Substituted Lactones by Enantioselective and Chemoselective Alkylation of Formylesters with Dialkylzincs Using<i>N</i>,<i>N</i>-Dibutylnorephedrine
作者:Kenso Soai、Shuji Yokoyama、Tomoiki Hayasaka、Katsumi Ebihara
DOI:10.1246/cl.1988.843
日期:1988.5.5
Optically active 4-alkyl-γ-butyrolactones and 5-alkyl-δ-valerolactones were obtained in high enantiomeric excesses (85–95% e.e.) from the catalytic asymmetric alkylation of 3- and 4-formylesters with dialkylzincs using N,N-dibutylnorephedrine as catalyst.
以 N,N-二丁基去甲麻黄碱为催化剂,用二烷基锌催化 3-和 4-甲酸酯与二烷基锌的不对称烷基化反应,获得了光学活性较高的 4-烷基-γ-丁内酯和 5-烷基-δ-戊内酯对映体过量(85-95% e.e.)。