Synthesis and Pharmacological Evaluation of 2-(1-Alkylpiperidin-4-yl)-N-[(1R)-1-(4-fluorophenyl)-2-methylpropyl]acetamide Derivatives as Novel Antihypertensive Agents
作者:Susumu Watanuki、Keisuke Matsuura、Yuichi Tomura、Minoru Okada、Toshio Okazaki、Mitsuaki Ohta、Shin-ichi Tsukamoto
DOI:10.1248/cpb.60.223
日期:——
We synthesized and evaluated the inhibitory activity of a series of 2-(1-alkylpiperidin-4-yl)-N-[(1R)-1-(4-fluorophenyl)-2-methylpropyl]acetamide derivatives against T-type Ca2+ channels. Structure–activity relationship studies revealed that the position of the amide structure was important for the potent inhibitory activity toward T-type Ca2+ channels. In addition, the introduction of an appropriate substituent on the pendant benzene ring played a crucial role for the selectivity towards T-type Ca2+ channels over L-type Ca2+ channels and the potent bradycardic activity of these derivatives. Oral administration of N-[(1R)-1-(4-fluorophenyl)-2-methylpropyl]-2-(1-2-[2-(2-methoxyethoxy)phenyl]ethyl}piperidin-4-yl)acetamide (4f), which had superior selectivity for T-type Ca2+ channels over L-type Ca2+ channels, lowered blood pressure in spontaneously hypertensive rats without inducing reflex tachycardia, which is often caused by traditional L-type Ca2+ channel blockers.
我们合成了并评估了一系列2-(1-烷基哌啶-4-基)-N-[(1R)-1-(4-氟苯基)-2-甲基丙基]乙酰胺衍生物对T型钙通道的抑制活性。结构-活性关系研究表明,酰胺结构的位置对强效抑制T型钙通道至关重要。此外,在悬挂的苯环上引入适当的取代基对这些衍生物对T型钙通道的选择性优于L型钙通道以及其强效的减缓心率作用起到了关键作用。口服给予N-[(1R)-1-(4-氟苯基)-2-甲基丙基]-2-(1-2-[2-(2-甲氧基乙氧基)苯基]乙基}哌啶-4-基)乙酰胺(4f),该化合物对T型钙通道的选择性优于L型钙通道,能降低自发性高血压大鼠的血压,且不会引起反射性心动过速,而这种心动过速通常是由传统的L型钙通道阻滞剂引起的。