Synthesis of β-chloro(trifluoromethyl)acroleins and a specific reaction towards β-aminothiols
作者:Gérard Alvernhe、Bernard Langlois、André Laurent、Isabelle Le Drean、Abdelaziz Selmi、Menfred Weissenfels
DOI:10.1016/s0040-4039(00)74849-0
日期:1991.1
beta-chloro-beta-(trifluoromethyl)acroleins and beta-chloro-alpha-(trifluoromethyl)-acrolein have been synthesized through Vilsmeier's reaction. A specific 1,4-addition of the nitrogen atom from beta-aminothiols is observed.
Trifluoromethyl substitution affects the regiochemistry of cyclising condensation in 1,4 substitution processes
作者:Gérard M. Alvernhe、André J. Laurent、Isabelle M. Le Dréan、Abdelaziz Selmi
DOI:10.1016/s0040-4039(00)60447-1
日期:1993.4
Beta-Trifluoromethyl beta-chloroacrolein 2 reacts with 2-mercaptoethylamine 3 to produce thiazolidine 5 instead of the expected thiazepine 8. The reason of this behaviour is the formation of the tetrahedral intermediate 6 because of stabilisation by the trifluoromethyl group ; an intramolecular substitution takes place faster than a 1,4 addition-elimination process.