Indole-phenol-bioisosterism. Synthesis and antihypertensive activity of a pyrrolo analog of labetalol
作者:Andre A. Asselin、Leslie G. Humber、Danilo Crosilla、George Oshiro、Alexandra Wojdan、David Grimes、Richard J. Heaslip、Thomas J. Rimele、Chia Cheng Shaw
DOI:10.1021/jm00156a019
日期:1986.6
The synthesis of 5-[hydroxy-2-[(1-methyl-3-phenylpropyl)amino]ethyl]-1H-indole-7- carboxamide, 5, a pyrrolo analogue of labetalol, is described. Compound 5 was found to reduce blood pressure in spontaneously hypertensive rats with an ED50 of 5 mg/kg po, without causing any decrease in heart rate. Isolated tissue studies with 5 shows that it is a nonselective beta-adrenoceptor antagonist and that it is a weaker alpha-adrenoceptor antagonist with a relative selectivity for alpha 1-receptors. Additionally, the compound displayed significant beta-adrenoceptor intrinsic sympathomimetic activity. Evidence is presented that the beta-adrenoceptor antagonist and agonist properties of 5 are mediated via hydrogen-bond formation with the receptor.