A series of new 4-amino-5,7-dimethyl-2- (substituted)aminopyrido(2,3-d)pyrimidines (5) have been synthesized and tested for selective alpha 1-adrenoreceptor antagonistic activity. Some of the compounds were found to antagonize alpha 1-adrenoreceptor in a competitive and reversible manner. When screened on rat anococcygeus muscle some of the compounds exhibited significant alpha 1-adrenoreceptor antagonistic activity (pA2 values in the range of 5.2-7.8). The most potent compound (5j) was evaluated by an in vivo method and was found to reduce the systolic and diastolic blood pressure of spontaneously hypertensive rats. The percentage reduction in blood pressure by test compound 5j was found to be higher than that of the standard drug prazosin (CAS 19216-56-9) at the same dose level (1 mg/kg p.o.). Chemically, prazosin is a 4-aminoquinazolin derivative. Pyridopyrimidine is a known bioisostere of quinazoline. The study revealed that isosteric replacement of the benzene ring of prazosin by a pyridine ring increases the potency.
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