Selective Muscarinic Antagonists. I. Synthesis and Antimuscarinic Properties of 4-Piperidyl Benzhydrylcarbamate Derivatives.
作者:Ryo NAITO、Makoto TAKEUCHI、Koichiro MORIHIRA、Masahiko HAYAKAWA、Ken IKEDA、Tadao SHIBANUMA、Yasuo ISOMURA
DOI:10.1248/cpb.46.1274
日期:——
A series of 1-substituetd-4-piperidyl benzhydrylcarbamate derivatives were synthesized and evaluated for binding affinity to M1, M2 and M3 receptors, and for antimuscarinic activities. Receptor binding assays indicated that 1-benzyl-4-piperidyl benzhydrylcarbamate derivatives showed higher affinities for M1 and M3 receptors, and good selectivities for M3 over M2 receptor, than the corresponding ester analog. These results indicate that the urethane bond is a novel linker for muscarinic antagonists, and serves to lock the molecular conformation and allows the hydrophobic portion and cationic site of the molecule to bind to M1 and M3 muscarinic receptors. Among the prepared compounds, 1-(4-methylaminobenzyl)-4-piperidyl benzhydrylcarbamate monohydrochloride (18b, YM-58790) exhibited potent inhibitory activity on bladder pressure in reflexly-evoked rhythmic contraction, comparable to oxybutynin and was approximately ten times less inhibitory on oxotremorine-induced salivary secretion than oxybutynin in rats. Further evaluation of antimuscarinic effects on bradycardia and pressor in pithed rats, and on tremor in mice, demonstrate that YM-58790 can be useful for treatment of urinary urge incontinence as a bladder-selective M3 antagonist with fewer side effects.
合成了一系列1-取代-4-哌啶基苯二氢基氨基甲酸酯衍生物,并评估了其对M1、M2和M3受体的结合亲和力及抗毒蕈碱活性。受体结合实验表明,1-苄基-4-哌啶基苯二氢基氨基甲酸酯衍生物对M1和M3受体表现出更高的亲和力,且在选择性上对M3优于M2受体,相较于相应的酯类类似物更为显著。这些结果表明,氨基甲酸酯键是毒蕈碱拮抗剂的一种新型连接基团,能够锁定分子构象,使分子的疏水部分和阳离子位点与M1和M3毒蕈碱受体结合。在所制备的化合物中,1-(4-甲基氨基苄基)-4-哌啶基苯二氢基氨基甲酸酯单盐酸盐(18b, YM-58790)在反射引发的节律性收缩中对膀胱压力表现出强抑制活性,与氧布氟对应,并且在大鼠对氧酸震颤素引起的唾液分泌抑制作用上大约比氧布氟低十倍。进一步对大鼠的心动过缓和升压反应以及小鼠震颤的抗毒蕈碱效应评估表明,YM-58790作为膀胱选择性M3拮抗剂,可以用于尿迫性失禁的治疗,且副作用较少。