Abstract
The reaction of 2-ethoxycarbonyl-3-aminoquinazolin-4-one (1) with aliphatic amines, ammonia and hydrazine hydrate gave 2-alkylamino/amino/hydrazinocarbonyl-3-aminoquinazolin-4-ones (2) which on reaction with ortho-esters resulted in 3, 4 and 5 respectively.