Organic Nitrates II[1]. Synthesis and Biological Activities of 4‐Nitrooxymethylphenyl‐1,4‐dihydropyridines

Abstract
Both 2‐nitrooxymethyl‐4‐phenyl‐ (2) and 4‐nitrooxymethylphenyl‐1,4‐dihydropyridines (3) represent new combinations of two different vasodilating structures. 2 could not be isolated due to its spontaneous lactonization. Derivatives of 3 were obtained via Hantzsch synthesis using nitrooxymethylated benzaldehydes. The inotropic potency in isolated porcine trabecular muscles and the vasodilator activity in isolated porcine coronary arteries of four nitrooxyphenyl‐dihydropyridines were determined. Nitrendipine (NTD) and glyceryl trinitrate (GTN) were used for reference. 3 were negative inotropic, however, less than NTD and ‐ except for the dicyano derivative 3d ‐ more than GTN. Vasodilator properties were less pronounced than that of both nitrendipine and GTN. Vascular selectivity was low.