Silver-promoted synthesis of vinyl sulfones from vinyl bromides and sulfonyl hydrazides in water
作者:Ge Zhang、Jian-Guo Fu、Qian Zhao、Gui-Shan Zhang、Meng-Yao Li、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1039/d0cc00784f
日期:——
The synthesis of vinylsulfones via silver-promoted cross-coupling of vinyl bromides with sulfonyl hydrazides was realized. Water was used as the sole solvent. Multisubstituted vinylsulfones were easily prepared with excellent alkyl group tolerance. A mechanism involving nucleophilic attack of a sulfinate anion was proposed.
Synthesis of Trifluoromethylated Tetrasubstituted Allenes via Palladium-Catalyzed Carbene Transfer Reaction
作者:Chao Pei、Zhen Yang、Rene M. Koenigs
DOI:10.1021/acs.orglett.0c02638
日期:2020.9.18
Herein, we report on the palladium-catalyzedsynthesis of trifluoromethylated, tetrasubstituted allenes from vinyl bromides and trifluoromethylated diazoalkanes in good to excellent yield. This reaction proceeds via oxidative addition of a Pd(0) complex with vinyl bromide. Subsequent base-promoted reductive elimination generates the allene. This methodology provides an efficient strategy even on gram