Spiro-Substituted Piperidines as Neurokinin Receptor Antagonists. II. Syntheses and NK2 Receptor-Antagonistic Activities of N-(2-Aryl-4-(spiro-substituted piperidin-1'-yl)butyl)carboxamides.
作者:Hirokazu KUBOTA、Akio KAKEFUDA、Hitoshi NAGAOKA、Osamu YAMAMOTO、Ken IKEDA、Makoto TAKEUCHI、Tadao SHIBANUMA、Yasuo ISOMURA
DOI:10.1248/cpb.46.242
日期:——
In the course of our research on spiro-compounds as neurokinin receptor antagonists, N-[2-aryl-4-(spiro-substituted piperidin-1'-yl)butyl]carboxamides were designed, based on YM-35375 (3) as a lead compound, and evaluated for NK2 receptor-antagonistic activities. Some derivatives inhibited the binding of radio-labeled neurokinin A to the NK2 receptor with IC50 values at the level of 10-9M. Among these compounds, (±)-1'-[4-(N-benzoyl-N-methylamino)-3-(3, 4-dichlorophenyl)butyl]spiro[benzo[c]thiophene-1(3H), 4'-piperidine] 2-oxide (58, YM-38336) showed 10 times more potent NK2 receptor binding affinity than compound 3 (IC50 values of 8.9 and 84nM, respectively). It showed more potent inhibitory activity (ID50 20μg/kg (i.v.)) against [β-Ala8]-NKA(4-10)-induced bronchoconstriction in guinea pigs than compound 3 (ID50 41μg/kg (i.v.)). This compound was also effective intraduodenally in the same model, exhibiting an ID50 value of 0.41μg/kg.
在我们对作为神经激肽受体拮抗剂的螺旋化合物的研究中,基于YM-35375 (3)作为先导化合物,设计了N-[2-芳基-4-(螺旋取代吡啶-1'-基)丁基]羧酰胺,并评估了其对NK2受体的拮抗活性。一些衍生物以IC50值在10^-9M水平上抑制了放射性标记的神经激肽A与NK2受体结合。在这些化合物中,(±)-1'-[4-(N-苯甲酰-N-甲基氨基)-3-(3, 4-二氯苯基)丁基]螺[苯并[c]噻吩-1(3H), 4'-吡啶] 2-氧化物 (58,YM-38336) 的NK2受体结合亲和力比化合物3强10倍 (IC50值分别为8.9和84nM)。该化合物对由[β-Ala8]-NKA(4-10)诱导的豚鼠支气管收缩表现出更强的抑制活性 (ID50 20μg/kg (静脉注射)),相比之下化合物3的ID50为41μg/kg (静脉注射)。在同一模型中,该化合物在十二指肠给药时也显示出有效性,ID50值为0.41μg/kg。