Abstract
In a previous paper, we described the reaction of some aromatic carboxylates with 2, 4-diamino-5-hydroxy-6-methylpyrimidine. In continuation with this work, this paper deals with the synthesis of oxazolo [4, 5-d] pyrimidines, pyrimido [5, 4-b] [1, 4] oxazines and pyrimido-[5, 4-b] [1, 4] oxazepines by the reaction of 2, 4-diamino-5-hydroxy-6-methylpyrimidine with aliphatic carboxylates.