1-Trifluoromethylvinylsilane as a CF<sub>2</sub>C<sup>-</sup>−CH<sub>2</sub><sup>+</sup> Synthon: Synthesis of Functionalized 1,1-Difluoro-1-alkenes via Isolable 2,2-Difluorovinylsilanes
作者:Junji Ichikawa、Hiroki Fukui、Yuichiro Ishibashi
DOI:10.1021/jo034718j
日期:2003.10.1
Various 1,1-difluoro-1-alkenes such as monosubstituted 1,1-difluoro-1-alkenes, 2-bromo-1,1-difluoro-1-alkenes, and 3,3-difluoroallylic alcohols are synthesized in two simple steps from 1-trifluoromethylvinylsilane: (i) its S(N)2' reaction with nucleophiles to construct 2,2-difluorovinylsilanes and (ii) the subsequent substitution of electrophiles for the vinylic silyl group. The combination of these two processes allows a one-pot synthesis of the functionalized 1,1-difluoro-1-alkenes starting from 1-trifluoromethylvinylsilane, which functions as a CF2=C--CH2+ synthon.