Spiro-Substituted Piperidines as Neurokinin Receptor Antagonists. III. Synthesis of (.+-.)-N-12-(3,4-Dichlorophenyl)-4-(spiro-substituted piperidin-1-yl)butyll-N-methylbenzamides and Evaluation of NK1-NK2 Dual Antagonistic Activities.
作者:Hirokazu KUBOTA、Akio KAKEFUDA、Yoshinori OKAMOTO、Masahiro FUJII、Osamu YAMAMOTO、Yoko YAMAGIWA、Masaya ORITA、Ken IKEDA、Makoto TAKEUCHI、Tadao SHIBANUMA、Yasuo ISOMURA
DOI:10.1248/cpb.46.1538
日期:——
To discover a novel NK1-NK2 dual antagonist, we have synthesized a series of spiro-substituted piperidines utilizing YM-35375 as a lead compound, and evaluated affinities for NK1 and NK2 receptors. In the N-methylbenzamide moiety, introduction of methoxy groups increased affinity for the NK1 receptor without a significant loss of affinity for the NK2 receptor. We also found that a conformation in which the phenyl groups of the N-methylbenzamide and 3, 4-dichlorophenyl moieties are close to each other through a cis-amide bond, may be favorable for showing high affinity for the NK1 receptor and that a hydrogen bond-accepting group in the spiro-substituted piperidine moiety may be crucial for exhibiting high affinity for the NK2 receptor. Among the compounds prepared, YM-44778 (31) showed high and well-balanced affinity for NK1 and NK2 receptors (IC50 values of 18 and 16 nM, respectively). This compound also exhibited potent antagonistic activities against both NK1 and NK2 receptors (IC50 values of 82 and 62 nM, respectively) in isolated tissues.
为了发现一种新型的NK1-NK2双重拮抗剂,我们以YM-35375为先导化合物,合成了一系列螺取代的哌啶类化合物,并评估了它们对NK1和NK2受体的结合亲和力。在N-甲基苯甲酰胺部分引入甲氧基团增加了对NK1受体的亲和力,而对NK2受体的亲和力没有显著损失。我们还发现,通过顺酰胺键使得N-甲基苯甲酰胺和3,4-二氯苯部分的苯环接近的构象,可能有利于表现对NK1受体的高亲和力,而螺取代哌啶部分中的氢键接受基团对于展现对NK2受体的高亲和力可能是至关重要的。在合成的化合物中,YM-44778(31)显示出对NK1和NK2受体的高且均衡的亲和力(IC50值分别为18和16 nM)。该化合物在分离的组织中也对NK1和NK2受体表现出强有力的拮抗活性(IC50值分别为82和62 nM)。