gem-Difluoroolefination of Diazo Compounds with TMSCF3 or TMSCF2Br: Transition-Metal-Free Cross-Coupling of Two Carbene Precursors
Mingyou Hu, Chuanfa Ni, Lingchun Li, Yongxin Han and Jinbo Hu*
*Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai, 200032, China, Email: jinbohusioc.ac.cn
M. Hu, C. Ni, L. Li, Y. Han, J. Hu, J. Am. Chem. Soc., 2015, 137, 14496-14501.
DOI: 10.1021/jacs.5b09888 (free Supporting Information)
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A transition-metal-free cross-coupling of two carbene fragments proceeds through the direct nucleophilic addition of diazo compounds to difluorocarbene derived from Ruppert-Prakash reagent (TMSCF3) or TMSCF2Br followed by elimination of N2. This transition-metal-free protocol efficiently affords various disubstituted 1,1-difluoroalkenes, including difluoroacrylates, diaryldifluoroolefins, as well as arylalkyldifluoroolefins.
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M. Hu, Z. He, B. Gao, L. Li, C. Ni, J. Hu, J. Am. Chem. Soc., 2013, 135, 17302-17305.