Synthesis of α-CF<sub>3</sub> and α-CF<sub>2</sub>H amines <i>via</i> the aminofluorination of fluorinated alkenes
作者:Ling Yang、Wen-Xin Fan、E. Lin、Dong-Hang Tan、Qingjiang Li、Honggen Wang
DOI:10.1039/c8cc03364a
日期:——
A novel synthesis of α-CF3 and α-CF2H amines via the aminofluorination of gem-difluoroalkenes and mono-fluoroalkenes, respectively, is reported. The method employsSelectfluor as an electrophilic fluorine source and acetonitrile as a nitrogen source. Mechanistic studies revealed a single-electron oxidation/fluorine-abstraction/Ritter-type amination pathway. The protocol allowed the synthesis of a broad
Dehalogenative Cross-Coupling of <i>gem</i>-Difluoroalkenes with Alkyl Halides <i>via</i> a Silyl Radical–Mediated Process
作者:Hao Tian、Shaoxiang Yang、Xiaochen Wang、Wentao Xu、Yuxiu Liu、Yongqiang Li、Qingmin Wang
DOI:10.1021/acs.joc.1c01363
日期:2021.9.17
Mechanistic experiments showed that the products were generated by selective cross-coupling of aliphatic radicals with fluoroalkenyl radicals. Silyl radical-mediated halogen abstraction enabled the protocol to be used for the monofluoroalkenylation of a broad range of alkyl and heteroaryl halides. The protocol could be carried out on a gram scale and was applied to cholesterol, indicating its utility
Highly efficient enantioselective nickel-catalyzed hydrosilylation of gem-difluoroalkenes has been realized. This system integrates direct generation of difluoromethylated stereocenters and enantioselective carbon(sp3)−silicon bond formation.
Advanced Strategies in Synthesis with Nickel Abstract 2-Fluoro-1,3-dienes were synthesized through nickel-catalyzed coupling reactions between β,β-difluorostyrenes and alkynes in the presence of ZrF4 as co-catalyst and a hydride source derived from triethylborane and lithium isopropoxide. Mechanistic studies revealed that the carbon–fluorine bond was cleaved by β-fluorine elimination from intermediary nickelacyclopentenes