Trifluoromethyl substitution affects the regiochemistry of cyclising condensation in 1,4 substitution processes
摘要:
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.
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.
Alvernhe, Gerard; Greif, Dieter; Langlois, Bernard, Bulletin de la Societe Chimique de France, 1994, vol. 131, p. 167 - 172