Oxidative Generation of 2-(Trifluoromethyl)- and 2-(Chlorodifluoromethyl)allylic Cations and Its Synthetic Application
作者:Toshio Fuchigami、Kayoko Yamamoto
DOI:10.1246/cl.1996.937
日期:1996.11
Oxidative generation of allylic cations having strong electron-withdrawing CF3 and CF2Cl groups from 2-(trifluoromethyl)- and 2-(chlorodifluoromethyl)allylsilanes was successfully carried out for the first time. The generated cation was trapped with nucleophiles such as arenes and acetonitrile.
Zinc-copper(I) chloride or -silver acetate promoted coupling reaction of 2-[(Trimethylsilyl)methyl]-3-chloro-3,3-difluoropropene with carbonyl compounds. Highly efficient access to 2,2-difluoro homoallyl alcohols
2-[(Trimethylsilyl)methyl]-3-chloro-3,3-difluoropropene, readily prepared in two steps from methyl chlorodifluoroacetate and (trimethylsilyl)methylmagnesium chloride, is reduced to couple regioselectivity with a variety of carbonylcompounds in the presence of zinc-copper(I) chloride or -silver acetate to give 2,2-difluoro-3-[(trimethylsilyl)methyl]-3-buten-1-ol derivatives in good to excellent yields