Models of folate cofactors - 22. Lewis acid catalyzed cyclization of carbon-fragment transfer products of folate cofactor models. Synthesis of enantiomerically pure tetracyclic (ABCE) ring system of aspidosperma alkaloids.
作者:R.H Huizenga、U.K Pandit
DOI:10.1016/s0040-4020(01)86452-8
日期:1991.1
Michael adducts of tryptamine, N(1)-methyltryptamine and tryptophane with acrylic esters react with substituted imidazolidines (N(5), N(10)-methylenetetrahydrofolate models) to give enaminones which cyclize under influence of Lewis acid, to give mixtures of tetrahydro-1H-pyrido[3,4-b]indoles and pyrrolo[2,3-d]carbazoles. The influence of the nature of Lewis acid on product formation is discussed. The synthesis of an enantiomerically pure pyrrolo[2,3-d]carbazole system is reported.