2-Alkoxycarbonylcycloimmonium ylides, efficient 1,4-dipole equivalents in the synthesis of new conjugated betaines.
作者:Ana M. Cuadro、Jesús Valenciano、Juan J. Vaquero、José L. García Navío、Julio Alvarez-Builla
DOI:10.1016/s0040-4020(01)89900-2
日期:1993.4
Several heterocyclic mesomeric betaines containing the bicyclic systems pyridol[1,2-a]pyrazine and pyrido [2,1-f][1,2,4]triazine have been prepared by reaction of 2-alkoxycarbonyl pyridinium N-ylides with phenyl isocyanate and isothiocyanate.