Nonprostanoid prostacyclin mimetics. 2. 4,5-diphenyloxazole derivatives.
作者:Nicholas A. Meanwell、Michael J. Rosenfeld、Ashok K. Trehan、J. J. Kim Wright、Catherine L. Brassard、John O. Buchanan、Marianne E. Federici、J. Stuart Fleming、Marianne Gamberdella
DOI:10.1021/jm00097a006
日期:1992.9
fashion, consistent with 18b inhibiting platelet function by acting as a prostacyclin mimetic. By inserting a phenoxy ring into the side-chain moiety of 18b and systematically varying the pattern of substitution and length of the tethers, more potent inhibitors of platelet aggregation were identified. A phenoxy ring inserted centrally in the side chain proved to be the optimal arrangement but significant
合成了4,5-二苯基-2-恶唑壬酸(18b),发现其抑制ADP诱导的人血小板聚集,IC50为2.5 microM。酸18b以浓度依赖的方式从人血小板膜置换了[3H]伊洛前列素,与18b通过充当前列环素模拟物抑制血小板功能相一致。通过将苯氧基环插入18b的侧链部分并系统地改变取代方式和系链长度,可以鉴定出更有效的血小板聚集抑制剂。证明在侧链中心插入的苯氧基是最佳排列,但是当芳环直接键合到杂环的2位时,观察到显着的活性。作为本研究的一部分,间位取代的顺式(乙烯基苯氧基)乙酸37是最有效的血小板凝集抑制剂,IC50为0.18 microM。酸37从人的血小板膜上置换了[3H]伊洛前列素,IC50为6 nM。作为ADP诱导的血小板凝集抑制剂,37(25p)的反式烯烃异构体弱72倍,但饱和衍生物25w(BMY 42393)的效力中等。以25w为模板进行结构活性研究的重点是侧链苯环与恶唑和羧酸根末端之