β3-Adrenoceptor agonists for the treatment of frequent urination and urinary incontinence: 2-[4-(2-{[(1S,2R)-2-hydroxy-2-(4-hydroxyphenyl)-1-methylethyl]amino}ethyl)phenoxy]-2-methylpropionic acid
作者:Nobuyuki Tanaka、Tetsuro Tamai、Harunobu Mukaiyama、Akihito Hirabayashi、Hideyuki Muranaka、Takehiro Ishikawa、Satoshi Akahane、Masuo Akahane
DOI:10.1016/s0968-0896(01)00240-1
日期:2001.12
In a search for novel analogues of beta (3)-adrenoceptor (AR) agonists relaxing the bladder for treatment of urinary dysfunction, 2-[4-(2-[(1S,2R)-2-hydroxy-2-(4-hydroxyphenyl)-1-methylethyl]amino}ethyl)phenoxy]-2-methylpropionic acids (1a-e), into which a fibrate-like structure ha been incorporated, were synthesised. Compound la was found to be a selective beta (3)-AR agonist in functional assays using the ferret detrusor (VAR), rat uterus (beta (2)-AR), and rat atrium (beta (1)-AR): beta (3): EC50 = 7.8 nM, beta (2): IC50 = 7,300 nM, beta (1): EC20 = 23,000 nM. The introduction of a chlorine atom or methyl substituent at the ortho-position on the phenyl ring of la further improved VAR selectivity. In an in vivo study, la lowered intrabladder pressure (ED50 = 31 mug/kg) in rats, without increasing heart rate, in keeping with the in vitro results. Consequently, it is proposed that la and its analogues (1b e), possess beta (3)-AR agonistic activity in the absence of undesirable beta (1)- or beta (2)-AR mediated actions. and may be useful for clinical treatment and pharmacological studies. (C) 2001 Elsevier Science Ltd. All rights reserved.