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.
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).