A novel series of platelet receptor glycoprotein (Gp) IIb/IIIa antagonists with condensed heterocycles as their basic core was synthesized. In an in vitro assay, trans-4-(5-amidinobanzofuran-2-carboxamido)cyclohexyloxyacetic acid 17e and trans-3-[4-(5-amidinobanzofuran-2-carboxamido)cyclohexyl]propionic acid 17f produced marked inhibitions with IC50 values of 0.018 and 0.006 μM, respectively in a human platelet adenosin-5'-diphospate (ADP)-induced aggregation assay; they also exhibited a wide spectrum of inhibition toward major aggregation agonists (ADP, collagen, thrombin, PMA (tumor promoter) and arachidonic acid). These compounds were >2-3 orders of magnitude more effective in inhibiting platelet aggregation than human umbilical vein endothelial cell (HUVEC) binding. The oral administration of 10 mg/kg of either 17e and 17f to guinea pig, resulted in a 60% inhibition of ex vivo platelet aggregation after 5 h. Oral administration of ethyl trans-4-(5-amidinobenzofuran-2-carboxamido)cyclohexyloxyacetate 18e (10 mg/kg) resulted in 80% inhibition of platelet aggregation in dogs for 6 h after oral administration with a return to baseline by 24 h. Ethyl trans-3-[4-(5-amidinobenzofuran-2-carboxamido)cyclohexyl]propionate 18f (AR0598) produced 80% inhibition for 5 h after oral administration. Prodrug 18e showed a good profile in dogs with a long duration of action. 18e (AR0510) was selected as suitable clinical candidate for development as an orally active antithrombotic agent.
合成了一系列新型的以稠合杂环为基本核心的血小板受体糖蛋白 (Gp) IIb/IIIa 拮抗剂。在体外试验中,反式-4-(5-
氨甲酰
苯并呋喃 -2- 羧酰胺基) 环己氧
乙酸 17e 和反式-3-[4-(5-
氨甲酰
苯并呋喃 -2- 羧酰胺基)环己基]
丙酸 17f 在人血小板
腺苷 -5'- 二
磷酸 (
ADP) 诱导的聚集试验中分别产生了显著的抑制作用,其 IC50 值分别为 0.018 和 0.006 μM;它们对主要的聚集激动剂 (
ADP、
胶原蛋白、凝血酶、
PMA (肿瘤
促进剂) 和
花生四烯酸) 也表现出广泛的抑制作用。这些化合物在抑制血小板聚集方面比人脐静脉内皮细胞 (HU
VEC) 结合的有效性高出 2-3 个数量级。将 17e 和 17f 以 10 mg/kg 的剂量口服给予豚鼠,5 小时后体外血小板聚集抑制率达到 60%。将反式-4-(5-
氨甲酰
苯并呋喃 -2- 羧酰胺基) 环己氧
乙酸乙酯 18e (10 mg/kg)口服给予狗,6 小时后血小板聚集抑制率达到 80%,24 小时后恢复到基线
水平。反式-3-[4-(5-
氨甲酰
苯并呋喃 -2- 羧酰胺基)环己基]
丙酸乙酯 18f (AR0598) 在口服给药后产生了 80% 的抑制作用,持续 5 小时。前药 18e 在狗体内显示出良好的特性,具有较长的作用持续时间。因此,18e (AR0510) 被选为适合开发的口服活性抗血栓药物的候选物。