Synthesis and Platelet-Activating Factor (PAF)-Antagonistic Activities of Trisubstituted Piperazine Derivatives.
作者:Hideto FUKUSHI、Hiroshi MABUCHI、Zen-ichi TERASHITA、Kohei NISHIKAWA、Hirosada SUGIHARA
DOI:10.1248/cpb.42.551
日期:——
2- or 3-Substituted 1-(2, 3-dimethoxy-6, 7-dihydro-5H-benzocyclohepten-8-ylcarbonyl)-4-(3, 4, 5-trimethoxybenzoyl)- and 4-(3, 4, 5-trimethoxybenzyl)piperazines (2a-s, 3a, b) were prepared and evaluated for antagonistic activities against platelet-activating factor (PAF)-induced platelet aggregation and blood pressure reduction. The 2-methoxymethyl derivative (2f) showed the most potent activities in this series. The enantiomers (R)-(+)-2f and (S)-(-)-2f were synthesized from carbobenzoxy-O-benzyl-L- and D-serine in several steps. In the binding experiment, (S)-(-)-2f showed thirty times greater affinity than the R isomer for the PAF receptor.
2-或3-取代的1-(2,3-二甲氧基-6,7-二氢-5H-苯并环庚烯-8-基羰基)-4-(3,4,5-三甲氧基苯甲酰基)和4-(3,4,5-三甲氧基苄基)哌嗪(2a-s,3a,b)被制备并评估了它们对血小板活化因子(PAF)诱导的血小板聚集和血压降低的拮抗活性。其中,2-甲氧甲基衍生物(2f)显示出系列中最强的活性。从苄氧羰基-O-苄基-L-和D-丝氨酸经过几个步骤合成了其对映体(R)-(+)-2f和(S)-(-)-2f。在结合实验中,(S)-(-)-2f对PAF受体的亲和力是R异构体的三十倍。