Microwave Irradiation as an Efficient Tool for the Generation of N-Heterocyclic o-Quinodimethanes: Synthesis of Polyheterocyclic Compounds by Diels-Alder Reactions

Microwave irradiation provides a general methodology for the generation of o-quinodimethanes derived from 1,2,4-tri­azine, pyrazole and 1,2,3-triazole. The cycloaddition reactions of such compounds with electron-deficient dienophiles allow the ­corresponding heteropolycyclic adducts to be obtained within 15 minutes in 51-87% yield.