X=Y-ZH systems as potential 1,3-dipoles. Part 26. 1,5-electrocyclisation and tandem 1,5-electrocyclisationAldol type condensation processes in imines.
作者:Ronald Grigg、H.Q. Nimal Gunaratne、Deirdre Henderson、Visuvanathar Sridharan
DOI:10.1016/s0040-4020(01)81969-4
日期:1990.1
A 1,2- prototropy route and an iminium ion route to vinyl azomethine ylides are described. In both cases the vinyl azomethine ylides undergo 1,5-electrocyclisation to dihydropyrroles. In the former case the 1,5-electrocyclisation is solvent sensitive and competes with a prototropic process giving the imine of an α, β-unsaturated α-amino ester. The mechanism and solvent sensitivity are discussed. In
描述了到乙烯基偶氮甲亚胺基的1,2-原生质途径和亚胺离子途径。在两种情况下,乙烯基偶氮甲亚胺基化物都经过1,5-电环化成二氢吡咯。在前一种情况下,1,5-电环化是溶剂敏感的,并且与质子化过程竞争,从而产生亚胺类的α,β-不饱和α-氨基酯。讨论了机理和溶剂敏感性。在后一种情况下,二氢吡咯经醛醇缩合进一步与醛反应。