Microwave-assisted addition of azomethines to isatoic anhydride

Diels–Alder addition of azomethines to isatoic anhydride in a solvent-free and eco-friendly condition is investigated using a microwave oven. The product is exclusively 2,3-diaryl-2,3-dihydroquinazolin- 4(1H)-ones 4a–d. HOMO–LUMO energy of the iminoketene and the dienophiles were calculated using semi-empirical AM1 calculations.