P. Bitha, J. Hlavka, Yang-i Lin
May 1, 1988
Citations
0
Influential Citations
3
Citations
Journal
Journal of Heterocyclic Chemistry
Abstract
[(1-Amino-6-hydroxy-2(1H)-pyrimidinylidene)hydrazone]butanedioic acid dimethyl esters 3, formed from 3-amino-2-hydrazino-4(3H)-pyrimidinones and dimethyl acetylenedicarboxylate in acetic acid at room temperature, underwent a facile, thermal rearrangement to 1-amino-2,6-dihydro-2,6-dioxo-1H-pyrimido-[1,2-b]-[1,2,4]triazine-3-acetic acid methyl esters 6 in hot acetic acid.