title: Antiallergy agents. 1. 1,6-Dihydro-6-oxo-2-phenylpyrimidine-5-carboxylic acids and esters.
abstract: The synthesis of some 1,6-dihydro-6-oxo-2-phenylpyrimidine-5-carboxylic acids and esters with potent oral and intravenous antiallergic activity against passive cutaneous anaphylaxis in the rat is described. Requirements for high activity include a free NH group in the pyrimidinone nucleus and a small to medium size ortho alkoxy or alkenyloxy group on the phenyl ring. It is suggested that in the case of the highly active compounds hydrogen bonding occurs between a nitrogen of the pyrimidine ring and the ethereal oxygen. The nature of this bonding and its possible contribution to an optimum configuration for the molecules is discussed.
mesh_terms: D000818:Animals; D001550:Benzamidines / Q000494:pharmacology; D002264:Carboxylic Acids / Q000138:chemical synthesis / Q000494:pharmacology*; D055598:Chemical Phenomena; D002621:Chemistry; D008297:Male; D010323:Passive Cutaneous Anaphylaxis / Q000187:drug effects*; D011743:Pyrimidines / Q000138:chemical synthesis / Q000494:pharmacology*; D051381:Rats; D013329:Structure-Activity Relationship
chemical_list: D001550:Benzamidines; D002264:Carboxylic Acids; D011743:Pyrimidines