Journal of Medicinal Chemistry p. 3011 - 3022 (1991)
Update date:2022-08-05
Topics:
Shanklin, James R.
Johnson, Christopher P.
Proakis, Anthony G.
Barrett, Richard J.
A series of 4-(diarylmethyl)-1-<3-(aryloxy)propyl>piperidines and structurally related compounds were synthesized as calcium-channel blockers and antihypertensive agents.Compounds were evaluated for calcium-channel-blocking activity by determineng their ability to antagonize calcium-induced contractions of isolated rabbit aortic strips.The most potent compounds were those with fluoro substituents in the 3- and/or 4-positions of both rings of the diphenylmethyl group.Bis(4-fluorophenyl)acetonitrile analogue 79 was similar in potency to bis(4-fluorophenyl)methyl compound 1.The methylene analogue of 1 (78) and derivatives of 1 that contained a hydroxyl (76), carbamoyl (80), amino (81), or acetamido (82) substituent on the methyl group were less potent.In most cases substituents on the phenoxy ring, changes in the distance between the aryloxy group and the piperidine nitrogen, and the substitution of S, N(CH3), or CH2 for the oxygen atom of the aryloxy group had only a small to moderate effect on the potency.The best compounds in this series were more potent than verapamil, diltiazem, flunarizine, and lidoflazine, but were less potent than nifedipine.Compounds were evaluated for antihypertensive activity in spontaneusly hypertensive rats (SHR) at an oral dose of 30 mg/kg.Of the 55 compounds tested, only nine produced a statistically significant (p<0.05) reduction in blood pressure greater than 20percent; all of these compounds had fluoro substituents in both rings of the diphenylmethyl group.One of the most active compounds in the SHR at 30 mg/kg was 1-<4-<3-<4-
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