‘Higher-order’ azomethine ylides in the synthesis of functionalized pyrroles and 5-oxo-5H-pyrrolizines
作者:Teresa M.V.D. Pinho e Melo、Maria I.L. Soares、Cláudio M. Nunes
DOI:10.1016/j.tet.2006.12.025
日期:2007.2
Azafulvenium methides generated by the thermal extrusion of SO2 from 1-methyl- and 1,1-dimethyl-1H,3H-pyrrolo[1,2-c]thiazole-2,2-dioxides undergo [1,8]H sigmatropic shifts to give vinylpyrroles. Flash vacuum pyrolysis of the C-vinylpyrroles affords 5-oxo-5H-pyrrolizines or C-allyl-1H-pyrroles. (c) 2006 Elsevier Ltd. All rights reserved.