α-diazodifluoroethane sulfonium reagent was developed in this study to undergo [3 + 2] radical cyclization with unactivated alkynes to give the corresponding 3-difluoromethyl pyrazoles under blue light irradiation conditions. The key to the success of this transformation lies in the formation of an electron donor–acceptor (EDA) complex between an electron-deficient α-diazo sulfonium salt and an electron-rich
In Situ Generated Fluorinated Iminium Salts for Difluoromethylation and Difluoroacetylation
作者:Etienne Schmitt、Baptiste Rugeri、Armen Panossian、Jean-Pierre Vors、Sergii Pazenok、Frédéric R. Leroux
DOI:10.1021/acs.orglett.5b02184
日期:2015.9.18
The use of TFEDMA, a fluoroalkyl amino reagent, for the difluoromethylation and difluoroacylation of arenes, heteroarenes, and C-H acidic compounds is reported. This approach allows for an efficient access to difluoromethylated products of high added value in good to excellent yields and with scale-up possibilities.
Filyakova; Karpenko; Kuznetsova, Russian Journal of Organic Chemistry, 1998, vol. 34, # 3, p. 381 - 387