A series of 1-indazol-3-(1-phenylpyrazol-5-yl)methyl ureas were investigated as hTRPV1 antagonists. The structure-activity relationship study was conducted systematically for both the indazole A-region and the 3-trifluoromethyl/t-butyl pyrazole C-region to optimize the antagonism toward the activation by capsaicin. Among them, the antagonists 26, 50 and 51 displayed highly potent antagonism with K_i(CAP) = 0.4-0.5 nM. Further, in vivo studies in mice indicated that these derivatives both antagonized capsaicin induced hypothermia, consistent with their in vitro activity, and themselves did not induce hyperthermia. In the formalin model, 51 showed anti-nociceptive activity in a dose-dependent manner.

研究了一系列1-吲唑-3-（1-苯基吡唑-5-基）甲基脲作为h TRPV1拮抗剂。系统地研究了吲唑A区和3-三氟甲基/叔丁基吡唑C区的结构-活性关系，以优化对辣椒素活化的拮抗作用。其中，拮抗剂26，50和51显示具有高度有效的拮抗作用ķ_我（CAP） = 0.4-0.5纳米。此外，在小鼠体内的研究表明，这些衍生物均拮抗辣椒素诱导的体温过低，与它们的体外相符活动，并且他们自己没有诱发热疗。在福尔马林模型中，51以剂量依赖性方式显示出抗伤害感受活性。