GRIGG, RONALD;THIANPATANAGUL, SUNIT;KEMP, JAMES, TETRAHEDRON, 44,(1988) N 23, C. 7283-7292
作者:GRIGG, RONALD、THIANPATANAGUL, SUNIT、KEMP, JAMES
DOI:——
日期:——
X=y-zh systems as potential 1,3-dipoles
作者:Ronald Grigg、Sunit Thianpatanagul、James Kemp
DOI:10.1016/s0040-4020(01)86100-7
日期:1988.1
Pyridoxal imines of ∞-amino acid esters and related amines undergo cycloaddition to N-phenylmaleimide on heating in acetonitrile, toluene or xylene. The cyclo-additions proceed in good yield, are stereospecific, and involve an endo-transition state. The reactive intermediates are postulated to be NH azomethine ylides produced stereospecifically from the imines by prototropy.