One‐Pot Synthesis of Trifluoromethylated 4‐Cyanoalka‐1,4‐dienes with Predominant <i>Z</i>‐Selectivity
作者:Yanchang Shen、Guoping Wang
DOI:10.1080/00397910500212841
日期:2005.10
The consecutive reaction of diethyl (1-cyanobut-3-enyl)phosphonate with n-butyllithium, trifluoroacetic anhydride, and Grignard reagents gave trifluoromethylated 4-cyano-alka-1,4-dienes in 45-89% yields with predominant Z-selectivity (Z: E = 89-78: 11 :22). Two isomers could be easily separated by column chromatography.