Mixed organofluorine-organosilicon chemistry. 3. A highly efficient and convenient synthesis of aryl perfluoroalk-1-enyl ketones from perfluoroalkyl iodides and aroylsilanes
摘要:
A one-pot procedure is described to synthesize aryl perfluoroalkenyl ketones with high yields from perfluoroalkyl iodides and aroylsilanes. It consists of conversion of the iodide to the perfluoroorganomagnesium bromide followed by reaction with the aroylsilane, in ether, at low temperatures (-45-degrees-C). Warming to room temperature and addition of triethylamine accelerate the process leading quantitatively to the enones, which can be isolated in the pure E-configuration. The mechanism of this synthesis, involving a Brook rearrangement, is discussed. An alternative procedure is proposed to synthesize the same enones, with equivalent efficiency, from 1-aryl-1-(trimethylsilyl)perfluoroalkan-1-ols.
Selectivity in the synthesis of fluorinated heterocycles from αβ-unsaturated perfluoroacyl derivatives (or their synthetic equivalents) and 1,2-bis-nucleophiles
Reactions of vicinal diamines, aminoalcohols, aminothiols with synthetic equivalents of perfluoroenones 3 or alpha,beta-unsaturated perfluoroesters 6 gave regiospecifically new five member (imidazo or oxazolidines) or seven member fluorinated heterocycles (dia or thiazepines).
Efficient Synthesis of 4-Fluoro-5-(perfluoroalkyl)pyrazoles from Organofluorosilicon Building Blocks