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).
Effect of fluorine on palladium-catalyzed cross-coupling reactions of aryl bromides with trifluoromethyl aryl ketones via difluoroenol silyl or monofluoroenol silyl ethers
作者:Yong Guo、Jean'ne M. Shreeve
DOI:10.1039/b705137a
日期:——
Palladium-catalyzed cross-coupling reactions of alpha-aryl-beta,beta-difluoroenol silyl and alpha-aryl-beta-fluoroenol silyl ethers with aryl bromides proceed smoothly with good functional compatibility.
2,2-Difluoro enol silyl ethers were readily prepared by Mg0 promoted selective defluorination of trifluoromethyl ketones in the presence of TMSCl, which involves CâF bond cleavage.