Studies on calcium(2+) channel antagonists. 5-[(3,4-Dimethoxyphenethyl)methylamino]-2-(3,4-dimethoxyphenyl)-2-isopropylpentyl isothiocyanate, a chemoaffinity ligand derived from verapamil

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Abstract
Reduction of 1 (verapamil) afforded amine 2, which was converted with thiophosgene to isothiocyanate 3, a chemoaffinity ligand for Ca2+ channels. Compound 3 showed concentration-dependent negative inotropic effects in rat right myocardial ventricular strips, EC50 = (4.56 .+-. 3.40) .times. 10-6 M (mean .+-. SD), being slightly less potent than 4 (gallopamil), EC50 = (1.95 .+-. 1.22) .times. 10-6 M. It displaced [3H]gallopamil in rat myocardial membranes, IC50 = (3.42 .+-. 2.51) .times. 10-7 M, approximately equipotent with 1. It showed irreversible antagonism of [3H]gallopamil binding when preincubated at 10-5 M; only 25% of [3H]gallopamil binding vs. control was observed. This agent may be a useful chemoaffinity ligand to aid in characterization of Ca2+ channels.

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