Base-induced conversion of 5-aminothiazolium salts into substituted pyrroles and pyrrolines via 1,3-dipolar cycloadditions with electron-deficient alkynes and alkenes
作者:Fabienne Berrée、Georges Morel
DOI:10.1016/0040-4020(95)00359-g
日期:1995.6
base-catalyzed rearrangements of the primary 1 : 1 cycloadducts, with retention of the elements of isothiocyanate. A similar initial cycloadduct 17 was isolated from N-phenylmaleimide which generally led to the condensed imino thiopyrans 20. Some of the 1,3-dipolar reactional stereoselectivities were deduced from the stereochemistry or distribution of the final products and found to be markedly dependent