Syntheses of 3-substituted pyrrole derivatives with antiinflammatory activity.
作者:KAZUO SAKAI、MAMORU SUZUKI、KENICHI NUNAMI、NAOTO YONEDA、YUICHI ONODA、YOSHIO IWASAWA
DOI:10.1248/cpb.28.2384
日期:——
Various dimethyl 3-substituted pyrrole-2, 4-dicarboxylates (3) were synthesized by the reaction of methyl isocyanoacetate (2) with methyl α-isocyanoacrylates (5) in the presence of base. This type of reaction was also applicable to the preparation of 3-substituted pyrrole-2, 4-dicarboxamides (10) by employing appropriate amide compounds (8) or (9) and (12) as reactants. Hydrolysis followed by decarboxylation of the pyrrole diester compounds (3) gave 3-substituted pyrroles (14) in good yields. A series of these compounds (14) showed antiinflammatory activities against carrageenan-induced rat paw edema. Among the compounds tested, 3-(2-chlorophenyl) pyrrole (14d) was found to be more potent than mefenamic acid.
通过异氰基乙酸甲酯(2)与α-异氰基丙烯酸甲酯(5)在碱存在下的反应,合成了各种 3-取代的吡咯-2,4-二羧酸二甲酯(3)。这种反应也适用于以适当的酰胺化合物(8)或(9)和(12)为反应物,制备 3-取代的吡咯-2,4-二甲酰胺(10)。吡咯二酯化合物(3)水解后再进行脱羧反应,可以得到产率很高的 3-取代吡咯(14)。一系列这些化合物(14)对角叉菜胶诱导的大鼠爪水肿具有抗炎活性。在测试的化合物中,发现 3-(2-氯苯基)吡咯(14d)比甲芬那酸更有效。