X = Y-ZH systems as potential 1,3-dipoles. part 27 Intramolecular cycloaddition reactions of imines of cyclic secondary α-amino esters. dipole and cycloaddition stereochemistry
作者:Ronald Grigg、Linda M. Duffy、Michael J. Dorrity、John F. Malone、Shuleewan Rajviroongit、Mark Thornton-Pett
DOI:10.1016/s0040-4020(01)89786-6
日期:1990.1
Condensation of cyclic secondary α- amino esters with aryl aldehydes containing an ω-alkenyl group leads to intramolecular 1,3-dipolar cycloaddition, via an intermediate azomethine ylide, in good yield. The stereochemistry of the azomethine ylides is controlled by steric interactions developing during conversion of the intermediate carbinolamines to the iminium ion species and generally results in