Difluoroenol silyl ethers 5 and 6, difluoroketene silyl (O,O-, O,S-, and O,N-) acetals 9 and 21, and 2,2-difluoro-2-trimethylsilylacetates 10 were prepared by electroreductive defluorination of trifluoromethyl ketones and trifluoroaceticacidderivatives in an MeCN-TBAB-chlorotrialkylsilane system using a carbon rod as an anode and a lead plate as a cathode. TBAF- or KF-CuI-promoted alpha-alkylation
2,2-Difluoroenol silyl ethers (5) were prepared by electroreductive defluorimation of trifluoromethyl ketones (4) in the presence of chlorotrialkylsilanes (TMSCl, TESCl, TBDMSCl).
remarkable fluorine effect on “on water” reactions is reported. The CF⋅⋅⋅HO interactions between suitably fluorinated nucleophiles and the hydrogen‐bond network at the phase boundary of oil droplets enable the formation of a unique microstructure to facilitate on water catalyst‐free reactions, which are difficult to realize using nonfluorinated substrates. Accordingly, a highlyefficient on water, catalyst‐free
A convenient synthesis of 2,2-difluoro enol silyl ethers from chlorodifluoromethyl ketones
作者:Masayuki Yamana、Takashi Ishihara、Teiichi Ando
DOI:10.1016/s0040-4039(00)81449-5
日期:——
Various chlorodifluoromethyl ketones can be converted to the corresponding 2,2-difluoro enol silylethers in good yields, by the action of zinc dust and chlorotrimethylsilane in dry acetonitrile at 60°C.