Novel, Potent, and Selective Phosphodiesterase 5 Inhibitors: Synthesis and Biological Activities of a Series of 4-Aryl-1-isoquinolinone Derivatives
作者:Tatsuzo Ukita、Yoshinori Nakamura、Akira Kubo、Yasuo Yamamoto、Yasunori Moritani、Kunio Saruta、Takanori Higashijima、Jun Kotera、Michino Takagi、Kohei Kikkawa、Kenji Omori
DOI:10.1021/jm000558h
日期:2001.6.1
A novel class of potent and selective phosphodiesterase 5 (PDE5) inhibitors, 4-aryl-1-iso-quinolinone derivatives, which have been designed by the comparison of the structure of cGMP and a previously reported 1-arylnaphthalene lignan, was disclosed. Among these compounds, methyl 2-(4-aminophenyl)-1,2-dihydro-1-oxo-7-(2-pyridinylmethoxy)-4-(3,4,5-trimethoxyphenyl)- 3-isoquinoline carboxylate dihydrochloride (36a) exhibited potent PDE5 inhibitory activity (IC50 = 1.0 nM) with high isozyme selectivities (IC50 ratio: PDE1/PDE5 = 1300, PDE2/PDE5 > 10 000, PDE3/PDE5 > 10 000, PDE4/PDE5 = 4700, PDE6/PDE5 = 28). Compound 36a also showed the most potent relaxant effect on isolated rabbit corpus cavernosum (EC30 = 7.9 nM). Compound 63 (T-1032), the sulfate form of 36a, was selected for further biological and pharmacological evaluation of erectile dysfunction.