Oxidation of 3-amino-2-isobutylquinazoline-4-one (2) with lead tetraac
etate at -20-degrees-C gave N-acetoxyamino-2-isobutylquinazolin-4-one
(3), which selectively aziridinated olefinic esters to yield substitut
ed lquinazolin-4'-one-3'-yl)-aziridine-2-carboxylates 5a-q.