Dual CCK-A and CCK-B Receptor Antagonists (II). Preparation and Structure Activity Relationships of 5-Alkyl-9-methyl-1,4-benzodiazepines and Discovery of FR208419.
作者:Seiichiro TABUCHI、Harunobu ITO、Hajime SOGABE、Masako KUNO、Takayoshi KINOSHITA、Ikuyo TATUMI、Naoko YAMAMOTO、Hitoshi MITSUI、Yoshinari SATOH
DOI:10.1248/cpb.48.1
日期:——
In our continuing research for dual CCK-A and -B antagonists, according to our hypothesis that dual CCK-A and -B antagonists should be more efficacious than selective CCK-A antagonists for the treatment of panreatitis, we have prepared various 5-alkyl-9-methyl-1, 4-benzodiazepines. From the compounds prepared, 1-cyclo-hexyl-carbonylmethyl-5-ethyl-9-methyl-3-(m-tolylureido)-2-oxo--1, 4-benzodiazepine, (40) was selected as a candidate for development due to its well-balanced high affinity for both receptors. The R-enantiomer of 40, (R)-40 (FR 208419), had 27-fold higher affinity for the CCK-A receprot and 8-fold more potent CCK-B receptor binding activity than (S)-40.The biological activity after p.o.administration of (R)-40, estimated from the ID50 value (0.23 mg/kg p.o.) obtained by preliminary evaluation by gastric emptying effects, is considered to be high enough for further development. This compound is now undergoing further biological evaluations with a view to clinical development.
在我们的持续研究中,为了寻找双CCK-A和-B拮抗剂,根据我们的假设,即双CCK-A和-B拮抗剂在治疗胰腺炎方面应比选择性CCK-A拮抗剂更有效,我们已合成了多种5-烷基-9-甲基-1,4-苯并二氮杂䓬类化合物。从所合成的化合物中,我们选定了1-环己基-羰基甲基-5-乙基-9-甲基-3-(间甲苯脲基)-2-氧代-1,4-苯并二氮杂䓬(40)作为开发候选物,因为它对两种受体均具有良好平衡的高亲和力。40的R-对映体(R)-40(FR 208419)对CCK-A受体的亲和力比(S)-40高27倍,对CCK-B受体的结合活性高8倍。通过胃排空效应的初步评估获得的ID50值(0.23 mg/kg口服)估计,(R)-40的口服生物活性足以支持进一步开发。目前,该化合物正在进行进一步的生物评估,以期进入临床开发阶段。