Z. G. Aliev, N. G. Vyaznikova, V. V. Zalesov
Dec 1, 1997
Citations
0
Influential Citations
7
Citations
Journal
Russian Chemical Bulletin
Abstract
EthylZ-5-aryl-2-diazo-5-hydroxy-3-oxopent-4-enoates interact with triphenylphosphine to give 6-aryl-3-ethoxycarbonyl-4-hydroxypyridazines (Ar=Ph, 4-MeC6H4, 4-ClC6H4). Quantum-chemical calculations (MNDO) were performed to estimate the tautomeric equilibrium in the latter using a 6-phenyl-substituted derivative as an example. Acetylation of the 4-hydroxypyridazines led to 4-acetoxy-6-aryl-3-ethoxycarbonylpyridazines. The structure of the latter was confirmed by an X-ray diffraction analysis of 4-acetoxy-3-ethoxycarbonyl-6-(p-tolyl)pyridazine.