Diels-Alder Reactions of N-Alkenyl-Iminium Salts: A Novel Route to Indolizidine Derivatives
作者:Jennline Sheu、Michael B. Smith、Kiyoshi Matsumoto
DOI:10.1080/00397919308009776
日期:1993.1
Abstract The Diels-Alder reaction of N-alkenyl-2-ethoxyiminium salts and simple alkenes gave Diels-Alder cycloadducts upon heating in nitromethane. Reduction of the intractable cycloadducts with hydride resulted in poor to moderate yields of indolizidine alkaloids.
A process for producing an azacycloalkane derivative represented by general formula (II), wherein m represents an integer of 1 to 3, n₂ represents an integer of 2 to 10, and R represents C₃ to C₁₂ alkyl, which comprises reacting 1-(n-alkenyl)azacycloalkan-2-one represented by general formula (I) wherein, m is as defined above and n₁ represents an integer of 0 to 8, with an alkyl mercaptan in the presence of a radical initiator in an organic solvent, treating the reaction product with a reducing agent in a watery organic solvent, followed by purification through distillation.