Imidazo[1, 2-α]pyridines. III. Synthesis and Bradycardic Activity of New 5-Imidazo[1, 2-a]pyridin-6-ylpyridine Derivatives

Structural modification of the cardiotonic agent, loprinone (E-1020, 1), suggested by data that it has a less positive chronotropic effect than milrinone (15), led us to find novel bradycardic agents that were structurally different from homoveratry amine derivatives. Alkyl-oxy, -thio, and -amino derivatives at the 2-position of the pyridine ring of 1 produced bradycardic activity without a significant effect on blood pressure and myocardial contractility. Aryloxy analogues also decreased heart rate, and members with an electron-withdrawing group at the ortho position of the phenyl ring showed higher activity. Replacement of the imidazo[1, 2-a]pyridine with pyridine resulted in diminished activity. The mechanism of bradycardic activity of these compounds seems to be direct action on the sinus node.