Studies on angiotensin converting enzyme inhibitors. III. 2-Carboxyethylcarbamoyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid derivatives.
作者:KIMIAKI HAYASHI、KENICHI NUNAMI、KAZUO SAKAI、YASUHIKO OZAKI、JYOJI KATO、KEIZO KINASHI、NAOTO YONEDA
DOI:10.1248/cpb.33.2011
日期:——
(3S)-2-[N-Substituted N-(2-carboxyethyl) carbamoyl]-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylic acid derivaties (8a-d and 12a-t) and their monoester compounds (13a-k) were synthesized by condensation of (3S)-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylates (6a, b), 3-aminopropionates (5a, b or 10a-m) and phosgene, followed by deprotection of ester groups. Their in vitro angiotensin converting enzyme (ACE) inhibitory activities and antihypertensive effects were evaluated, and the structure-activity relationship is discussed. Some of the N-ethylcarbamoyl analogs (12h, 12j, 12k, 12l and 12o), which had hydrophobic substituents (C8H17-C12H25, CH2CH2Ph) at the α-position to the carboxyl group in the side chain, showed potent in vitro ACE inhibitory activities with IC50 values of 4.0-8.8×10-9M. The monoesters 13e, 13h, and 13i reduced the systolic blood pressure by more than 30 mmHg in spontaneously hypertensive rats (SHR) at an oral dose of 50mg/kg.
(3S)-2-[N-取代的N-(2-羧乙基)氨基甲酸]-1, 2, 3, 4-四氢异喹啉-3-羧酸衍生物 (8a-d 和 12a-t) 及其单酯化合物 (13a-k) 通过 (3S)-1, 2, 3, 4-四氢异喹啉-3-羧酸酯 (6a, b)、3-氨基丙酸酯 (5a, b 或 10a-m) 和氯仿的缩合反应合成,随后去保护酯基。评估了它们在体外的血管紧张素转化酶 (ACE) 抑制活性及抗高血压效果,并讨论了结构-活性关系。一些具有疏水取代基(C8H17-C12H25,CH2CH2Ph)在侧链α位与羧基相邻的N-乙基氨基甲酸类似物 (12h, 12j, 12k, 12l 和 12o) 显示出强大的体外ACE抑制活性,IC50值为4.0-8.8×10^-9M。单酯化合物13e、13h和13i在口服剂量为50mg/kg时,能使自发性高血压大鼠 (SHR) 的收缩压下降超过30 mmHg。