Nonprostanoid prostacyclin mimetics. 5. Structure-activity relationships associated with [3-[4-(4,5-diphenyl-2-oxazolyl)-5-oxazolyl]phenoxy]acetic acid
作者:Nicholas A. Meanwell、Jeffrey L. Romine、Michael J. Rosenfeld、Scott W. Martin、Ashok K. Trehan、J. J. Kim Wright、Mary F. Malley、Jack Z. Gougoutas、Catherine L. Brassard
DOI:10.1021/jm00076a018
日期:1993.11
cis-olefin moiety of 3 into various ring systems was examined. Incorporation of the cis-olefin of 3 into either an oxazole (26) or an unsubstituted pyrazole (35) heterocycle provided compounds that are equipotent with progenitor 3. However, the oxazole 11f, which is isomeric with 26, inhibits ADP-induced human platelet aggregation in vitro with an IC50 of 0.027 microM, 6-fold more potent than 3, 26, or
顺式[[3- [2-(4,5-二苯基-2-恶唑基)乙烯基]苯氧基]乙酸(3)先前被鉴定为非前列腺素类前列环素(PGI2)模拟物,可有效抑制ADP诱导的人血小板聚集IC50为0.18 microM。作为进一步探索此类血小板抑制剂的结构活性关系并提供对非前列腺素类PGI2模拟药效团的进一步了解的努力的一部分,我们研究了将3的顺式-烯烃部分限制在各种环系统中的作用。将3的顺式烯烃引入到恶唑(26)或未取代的吡唑(35)杂环中,可提供与祖细胞3等效的化合物。但是,与26异构的恶唑11f抑制ADP诱导的人血小板。体外聚集,IC50为0.027 microM,效力是3的6倍,26或35。这些结果表明,11f的中心恶唑环的作用不只是提供与PGI2受体相互作用的最佳立体定义的简单支架。假定11f的中心杂环的氮原子与PGI2受体蛋白中的供体部分参与氢键形成,由于拓扑结构明显不同,这种相互作用对于26是不可用