Synthesis 2022; 54(09): 2193-2204
DOI: 10.1055/a-1702-4445
paper

Cobalt–Tertiary Amine Mediated Peroxy-trifluoromethylation and -halodifluoromethylation of Alkenes with CF2XBr (X = F, Cl, Br) and tert-Butyl Hydroperoxide

Liangzhi Pang
a   Department of Applied Chemistry, Anhui Agricultural University, Hefei 230036, P. R. of China
,
Qilin Sun
a   Department of Applied Chemistry, Anhui Agricultural University, Hefei 230036, P. R. of China
,
Zhan Huang
a   Department of Applied Chemistry, Anhui Agricultural University, Hefei 230036, P. R. of China
,
Suhua Li
b   School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. of China
c   Key Lab of Functional Molecular Engineering of Guangdong Province, South China University of Technology, Guangzhou 510641, P. R. of China
,
Qiankun Li
a   Department of Applied Chemistry, Anhui Agricultural University, Hefei 230036, P. R. of China
› Author Affiliations
We would like to thank the National Natural Science Foundation of China (Grant No. 22001008 to Q.L. and No. 21971260 to S.L.), Anhui Provincial Natural Science Foundation (Grant No. 2008085QB61), Anhui Agricultural University (Nos. RC381902 and 2019zd13) to Q.L., Natural Science Foundation of Guangdong Province for Distinguished Young Scholars (No. 2018B030306018), the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (No. 2017ZT07C069), the Pearl River Talent Recruitment Program ofGuangdong Province (No. 2019QN01L111), and the Open Fund of the Key Laboratory of Functional Molecular Engineering of Guangdong Province, South China University of Technology (No. 2018kf04) to S.L.


Abstract

An efficient cobalt-tertiary amine mediated peroxy-trifluoromethylation and -halodifluoromethylation of alkenes with simple and inexpensive CF2XBr (X = F, Cl, Br) has been described. This method demonstrated broad substrate scope and good to high yields with the tolerance of mono-, di-, and trisubstituted alkenes with both electron-donating and electron-withdrawing groups. The protocol provides an efficient access to various β-peroxyl trifluoromethyl/halodifluoromethyl derivatives. Further transformation of these type of compounds into other useful molecules, such as a ketene aminal, an α-trifluoromethyl ketone, and a gem-difluoroalkene, demonstrated the utility of this methodology.

Supporting Information



Publication History

Received: 22 October 2021

Accepted after revision: 22 November 2021

Accepted Manuscript online:
22 November 2021

Article published online:
20 January 2022

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