A highly efficient and catalyst-free protocol is reported for the synthesis of quinoxalines
via the classical cyclocondensation reaction between aryldiamines and dicarbonyl compounds.
Remarkably simple and green reaction conditions employing methanol as solvent afforded
medium to excellent yield of quinoxalines after only one-minute reaction time at ambient
temperature. The conditions allow at least 10 gram scale synthesis of quinoxalines
and should be a preferred starting point for optimization and method of choice for
applications in the synthetic community.
Key words
quinoxaline - diamine - condensation - diketone - green