Discovery of 2-(1H-indazol-1-yl)-thiazole derivatives as selective EP1 receptor antagonists for treatment of overactive bladder by core structure replacement
We have designed a series of potent EP1 receptor antagonists. These antagonists are a series of 2-(1H-indazol-1-yl)-thiazoles in which the corestructure was replaced with pyrazole-phenyl groups. In preliminary conscious rat cystometry experiments, two representative candidates, 2 and 22, increased bladder capacity. In particular, the increase using 22 was approximately 2-fold that of the baseline