Nonprostanoid prostacyclin mimetics. 4. Derivatives of 2-[3-[2-(4,5-diphenyl-2-oxazolyl)ethyl]phenoxy]acetic acid substituted .alpha. to the oxazole ring
作者:Nicholas A. Meanwell、Michael J. Rosenfeld、J. J. Kim Wright、Catherine L. Brassard、John O. Buchanan、Marianne E. Federici、J. Stuart Fleming、Marianne Gamberdella、Karen S. Hartl
DOI:10.1021/jm00076a017
日期:1993.11
inhibited platelet aggregation with an IC50 of 0.08 microM, 15-fold more potent than the unsubstituted prototype 2. The potency of 12a was found to be sensitive to variation of the methoxy moiety. The ethyl (12b) and isopropyl (12d) esters were less effective as were the acid 12e and a series of amides (12f-h). Other substituents introduced at this site of the pharmacophore included P(O)(OEt)2 (25), SCH3
4,5-二苯基恶唑衍生物2-4先前被确定为非前列腺素前列环素(PGI2)模拟物。合成了一系列在恶唑环的碳原子α处带有2-4个取代基的衍生物,并将其作为体外ADP诱导的人血小板聚集的抑制剂。在不饱和系列中,以几何异构体的均等混合物形式评估的α-甲乙氧基衍生物10a抑制了血小板凝集,IC50为0.36 microM。对各个甲酯衍生物(E)-9a和(Z)-9a的评估表明,(E)-9a的效力比(Z)-9a高10倍。在饱和系列中,α-甲氧基甲氧基取代的化合物12a抑制血小板凝集,IC50为0.08 microM,效力比未取代的原型2高15倍。发现12a的效力对甲氧基部分的变化敏感。乙基(12b)和异丙基(12d)酯的效果不如酸12e和一系列酰胺(12f-h)。在药效团此位点引入的其他取代基包括P(O)(OEt)2(25),SCH3(31a),S(O)CH3(31b),SO2CH3(31c),异丙基(