1,2-Diaza-1,3-butadienes: Just a nice class of compounds, or powerfultoolsin organic chemistry? Reviewing an experience

Abstract

This paper reviews our nearly twenty-five years' activity on 1,2-diaza-1,3-butadienes and shows that these compounds are powerful tools in organic chemistry. In fact, α-substituted-, α-oxo-, and α,β-unsaturated-hydrazones, have been obtained from 1,2-diaza-1,3-butadienes, as have pyrroles, pyrazoles, imidazoles, thiazoles, selenazoles, 1,2,3-thiadiazoles, 1,2,3-selenadiazoles, pyridazines, pyrazines, 1,2,4-triazines, and mixed heterocyclic systems.