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.
Synthesis of Polyfluorinated Nitrogen-Containing Heterocycles from Hemifluorinated Enones or Organofluorosilicon Building Blocks as Synthetic Equivalents
equivalents with different bis(nucleophiles). These polyfluorinated building blocks were obtained by treatment of acylsilanes with perfluoro organometallic reagents. The method is general and has been applied to aliphatic, aromatic and carbohydrate derivatives, to give oxazolidines, imidazolidines, benzodia- and -thiazepines, quinolines and pyrimidines bearing both a fluorine atom and a perfluoroalkyl