Studies on angiotensin converting enzyme inhibitors. II. Syntheses and angiotensin converting enzyme inhibitory activities of 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.31.3553
日期:——
(3S)-2-[N-Substituted N-(2-carboxyethyl)carbamoyl]-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylic acid derivatives (V) were synthesized by condensation of (3S)-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylates (III), 3-alkylaminopropionates (II), and phosgene, followed by cleavage of ester groups. The in vitro angiotensin converting enzyme (ACE) inhibitory activities of these dicarboxylic acid derivatives (V) were evaluated. Among them, N-ethyl (13) and N-isopropyl (14) derivatives showed high inhibitory activities with IC50 values of 1.1×10-8 and 7.7×10-8M, respectively. These compounds showed only weak inhibition of the pressor response to angiotensin I after oral administration in normotensive rats. Thus, in order to derive orally active inhibitors, the ester derivatives (IV, VI, and VII) were prepared as prodrugs of the dicarboxylic acids (V). Of these esters, the monoester compounds (VI) having the ester function at the side chain were found to be orally active. In particular, (3S)-2-[N-ethyl-N-(2-butoxycarbonylethyl)carbamoyl]-1, 2, 3, 4-tetrahydroisoquinoline-3-carboxylic acid (20) inhibited the pressor response to angiotensin I by up to 82% at an oral dose of 1.0 mg/kg.
(3S)-2-[N-取代的N-(2-羧乙基)氨基甲酰基]-1,2,3,4-四氢异喹啉-3-羧酸衍生物(V)由(3S)-1,2缩合合成, 3, 4-四氢异喹啉-3-羧酸酯(III)、3-烷基氨基丙酸酯(II)和光气,然后裂解酯基。评价了这些二羧酸衍生物(V)的体外血管紧张素转换酶(ACE)抑制活性。其中,N-乙基(13)和N-异丙基(14)衍生物表现出较高的抑制活性,IC50值分别为1.1×10-8和7.7×10-8M。在血压正常的大鼠中口服给药后,这些化合物仅表现出对血管紧张素 I 的升压反应的弱抑制作用。因此,为了衍生口服活性抑制剂,将酯衍生物(IV、VI和VII)制备为二羧酸(V)的前药。在这些酯中,发现在侧链具有酯官能团的单酯化合物(VI)具有口服活性。特别是,(3S)-2-[N-乙基-N-(2-丁氧基羰基乙基)氨基甲酰基]-1,2,3,4-四氢异喹啉-3-羧酸(20)抑制血管紧张素I的升压反应高达口服剂量 1.0 mg/kg 时可达到 82%。