Ph3P+CF2CO2− as an F− and :CF2 source for trifluoromethylthiolation of alkyl halides
作者:Zhuo Liu、Jin Long、Xuan Xiao、Jin-Hong Lin、Xing Zheng、Ji-Chang Xiao、Yu-Cai Cao
DOI:10.1016/j.cclet.2018.11.013
日期:2019.3
As trifluoromethylthiolation has received increasing attention recently, many CF3S-reagents and trifluoromethylthiolation methods have been developed. Herein we describe trifluoromethylthiolation of alkyl halides by using Ph3P+CF2CO2 as a fluoride and difluorocarbene source. Difluorocarbene is a versatile intermediate, but its side reactions are usually ignored and the by-products would therefore be discarded. In this work, a side reaction of difluorocarbene, the generation of a fluoride anion from difluorocarbene, was developed into a synthetic tool. Although the trifluoromethylthiolation reaction involved multi-sequential steps, the cleavage of C-F bond, the formation of CF2=S bond, F-C(S)F-2 bond, and C-SCF3 bond, the conversion proceeded fast and was completed within 10 min. (C) 2018 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.