Synthesis of 3-substituted pyrazolo(1,5-a)pyridine derivatives with inhibitory activity on platelet aggregation. I.
作者:KATSUYA AWANO、SEIGO SUZUE、MITSURU SEGAWA
DOI:10.1248/cpb.34.2828
日期:——
3-Nicotinoylpyrazolo[1, 5-a]pyridines were synthesized by the raation of 3-unsubstituted pyrazolo[1, 5-a]pyridines with nicotinoyl chloride hydrochloride. Tetrahydronicotinoyl derivatives were obtained by hydrogenation of the nicotinoyl derivatives. Furthermore, N-substituted derivatives were synthesized by the reaction of the tetrahydronicotinoyl derivatives with alkylating regents or isocyanates. These pyrazolo[1, 5-a]pyridines were tested for inhibitory activity on arachidonic acid induced platelet aggregation in vitro and ex vivo. Some of these compounds showed higher inhibitory activity than aspirin. Among them, 2-methyl-3-(1, 4, 5, 6-tetrahydronicotinoyl)pyrazolo[1, 5-a]pyridine was found to be the most active compound.
3- 未取代的吡唑并[1, 5-a]吡啶与烟酰氯盐酸盐反应合成了 3-烟酰基吡唑并[1, 5-a]吡啶。通过对烟碱酰氯衍生物进行氢化,得到了四氢烟碱酰氯衍生物。此外,通过四氢烟酰衍生物与烷基化调节剂或异氰酸酯的反应,还合成了 N-取代衍生物。这些吡唑并[1, 5-a]吡啶在体外和体内测试了对花生四烯酸诱导的血小板聚集的抑制活性。其中一些化合物的抑制活性高于阿司匹林。其中,2-甲基-3-(1,4,5,6-四氢烟酰)吡唑并[1,5-a]吡啶被认为是活性最强的化合物。