Stereoselective synthesis of α-fluoroacrylonitriles <i>via</i> organocatalytic cyanation of <i>gem</i>-difluoroalkenes and TMSCN
作者:Yu-Chuan Ma、Yang Zhang、Cheng-Zhi Gu、Guang-Fen Du、Lin He
DOI:10.1039/c9nj02370d
日期:——
An organocatalytic cyanationreaction of gem-difluoroalkenes was developed. Under the catalysis of 10 mol% DBU, gem-difluoroalkenes undergo a nucleophilic addition-β-elimination reaction with trimethylsilylcyanide to provide α-fluoroacrylonitriles in 50–98% yields with excellent Z/E selectivity.
A general method for the synthesis of alpha-fluorocinnamonitrile based on the stereoselective reaction between beta-bromo-beta-fluorostyrene and potassium cyanide, promoted by (CH3CN)(4)Cu+ BF4- in 1-methyl-2-pyrrolidinone (NMP), is described. (C) 2011 Elsevier Ltd. All rights reserved.