Mixed organofluorine-organosilicon chemistry. 4. Perfluoroenoxysilanes: synthesis and reactivity
摘要:
1-Alkyl (or aryl)-1-[(trialkylsilyl)oxy]perfluoroalk-1-enes were synthesized from acylsilanes and perfluoroalkyl iodides. Perfluoroorganolithium and magnesium were used for aliphatic and aromatic derivatives, respectively. These enoxysilanes have nucleophilic as well as electrophilic properties. They are enolate equivalents, leading to 2-hydroperfluoroalkyl ketones on hydrolysis, or aldol products. With good nucleophiles like amines, they react as electron poor alkenes to give beta-enamino ketones.
Mixed organofluorine-organosilicon chemistry. 4. Perfluoroenoxysilanes: synthesis and reactivity
摘要:
1-Alkyl (or aryl)-1-[(trialkylsilyl)oxy]perfluoroalk-1-enes were synthesized from acylsilanes and perfluoroalkyl iodides. Perfluoroorganolithium and magnesium were used for aliphatic and aromatic derivatives, respectively. These enoxysilanes have nucleophilic as well as electrophilic properties. They are enolate equivalents, leading to 2-hydroperfluoroalkyl ketones on hydrolysis, or aldol products. With good nucleophiles like amines, they react as electron poor alkenes to give beta-enamino ketones.
Mixed organofluorine - organosilicon chemistry: reaction of perfluoroorganometallic reagents with benzoylsilane
作者:Charles Portella、Boniface Dondy
DOI:10.1016/s0040-4039(00)71224-x
日期:1991.1
Reaction of a perfluoroorganometallic (Mg or Li) reagent with benzoylsilanes gives, depending on the metal, the substituents and the reaction conditions, the F-alkyl phenyl trialkylsilyl carbinol , the F-alk-1-enyl phenyl ketone or the 1-phenyl-1-trialkylsilyloxy-F-alk-1-ene .
Mixed organofluorine-organosilicon chemistry. 3. A highly efficient and convenient synthesis of aryl perfluoroalk-1-enyl ketones from perfluoroalkyl iodides and aroylsilanes
作者:Boniface Dondy、Charles Portella
DOI:10.1021/jo00076a028
日期:1993.11
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.