Synthesis of 3-[4-acyl-2-(1-methoxy-1-methylethyl)morpholin-3-yl]- benzonitriles as novel potassium channel openers
Journal
Journal of the Chinese Chemical Society
Journal Volume
51
Journal Issue
1
Pages
157-165
Date Issued
2004
Author(s)
Abstract
Abstract Potassium channel openers (KCO's) have been demonstrated to possess potent relaxant‐activity on smooth muscle. Tissue‐selective KCO's may find use in the treatment of a variety of diseases, such as hypertension, asthma, and urinary incontinence. We have previously reported a series of 1,9‐dioxa‐4‐aza‐phenanthrene‐6‐carbonitriles, including compounds 2 & 3 , as bladder‐selective KCO's. As a continuation of our efforts, we have designed 3‐[4‐acyl‐2‐(1‐methoxy‐1‐methylethyl)morpholin‐3‐yl]‐benzonitriles as ring‐opened analogs of compounds 2 & 3 . In this report, we describe the efficient construction of the novel 2,3‐disubstituted morpholine structure, as represented by the synthesis of compounds 4‐7 . Compounds 4‐7 showed potent and selective relaxant‐activity on rat bladder detrusor strip preparation. In this series, the most potent derivatives are Boc‐substituted analogs 4 & 6 (IC 50 = 3.9 and 2.9 μM, respectively).
Type
journal article