Crude coumarin constituents of Peucedanum praeruptorum Duun. including praeruptorin A (=Pd-Ia)(2) and B (=Pd-II)(11) had an antagonistic effect on a specific platelet activating factor (PAF) in the platelet aggregation induced by several aggregating agents. This provides a new class of PAF antagonists. Studies of the structure-activity relationship with khellactone (1) derivatives and PAF antagonistic activity indicate that the cis isomers of 1 at the C-3' and C-4' positions are more favorable than trans isomers, and the acyl moiety at the C-3' position of 1 requires an appropriate molecular size.
Peucedanum praeruptorum Duun. 的粗类
香豆素成分,包括 praeruptorin A (=Pd-Ia)(2) 和 B (=Pd-II)(11),对由多个聚集剂诱导的血小板聚集中一种特定的血小板激活因子 (PAF) 产生了拮抗作用。这提供了一类新的 PAF 拮抗剂。对 khellactone (1) 衍
生物与 PAF 拮抗活性之间的结构-活性关系研究表明,1 在 C-3' 和 C-4' 位点的顺式异构体比反式异构体更为有利,并且 1 在 C-3' 位点的酰基部分需要适当的分子大小。