Reaction of Thiocarbonyl Fluoride Generated from Difluorocarbene with Amines
作者:Jiao Yu、Jin-Hong Lin、Ji-Chang Xiao
DOI:10.1002/anie.201710186
日期:2017.12.22
The reaction of thiocarbonyl fluoride, generated from difluorocarbene, with various amines under mild conditions is described. Secondary amines, primary amines, and o‐phenylenediamines are converted to thiocarbamoyl fluorides, isothiocyanates, and difluoromethylthiolated heterocycles, respectively. Thiocarbamoyl fluorides were further transformed into trifluoromethylated amines by using a one‐pot process
The conditions for difluoromethylation of 2-mercaptobenzimidazoles with difluorocarbene (CHClF2 in alkaline medium) at the sulfur atom or at two reaction centres - sulfur and nitrogen or two nitrogen atoms - were found. In the similar reaction, 2-mercapto-4(5)-(4-nitrophenyl)imidazole gives the product of bis(difluoromethylation) at the sulfur and nitrogen atoms. Benzimidazoles with two fluorinated alkyl substituents at the two nitrogen atoms were prepared for the first time. The N-difluoromethyl derivative of benzothiazole-2-thione was obtained by this procedure. (C) 2001 Elsevier Science B.V. All rights reserved.