Synthesis of pyrazolone derivatives. XXXIX. Synthesis and analgesic activity of pyrano(2,3-c)pyrazoles.
作者:TAISEI UEDA、HIDESHI MASE、NORIICHI ODA、ISOO ITO
DOI:10.1248/cpb.29.3522
日期:——
Syntheses of pyrano [2, 3-c] pyrazoles by means of the reaction of 3-ethoxycarbonyl-5-hydroxy-1-methyl (or phenyl) pyrazole (Ia, b) and acetylenecarboxylates or ethyl acetoacetate were examined. The reactions of Ia, b with acetylenecarboxylates gave 3-ethoxycarbonyl-4-substituted-1-methyl (or phenyl) pyrano [2, 3-c] pyrazol-6 (1H)-ones (IIa-c) in 5.9-23.9% yields. The Pechmann-Duisberg reaction of Ia-c with ethyl acetoacetate gave 3-ethoxycarbonyl-4-methyl-1-substitutedpyrano [2, 3-c] pyrazol-6 (1H)-ones (VIIa-c) in 33.1-46.2% yields. Similar reactions of 5-hydroxy-3-methylcarbamoyl-1-phenyl (or m-chlorophenyl) pyrazoles (IXa, b) with ethyl acetoacetate gave 4-methyl-3-methylcarbamoyl-1-phenyl (or m-chlorophenyl) pyrano [2, 3-c] pyrazol-6 (1H)-ones (Xa, b) in 17.4-30% yields. The newly synthesized pyrano [2, 3-c] pyrazoles (Xa, Xb, XII) showed analgesic activity in mice when tested by two methods.
研究了通过 3-乙氧羰基-5-羟基-1-甲基(或苯基)吡唑(Ia, b)与乙炔羧酸酯或乙酰乙酸乙酯反应合成吡喃并[2, 3-c]吡唑的方法。Ia, b 与乙炔羧酸酯反应生成 3-乙氧羰基-4-取代-1-甲基(或苯基)吡喃并[2, 3-c] 吡唑-6 (1H)-酮(IIa-c),产率为 5.9-23.9%。Ia-c 与乙酰乙酸乙酯的 Pechmann-Duisberg 反应生成 3-乙氧羰基-4-甲基-1-取代的吡喃并[2,3-c] 吡唑-6 (1H)-酮(VIIa-c),收率为 33.1-46.2%。5-hydroxy-3-methylcarbamoyl-1-phenyl (or m-chlorophenyl) pyrazoles (IXa, b) 与乙酰乙酸乙酯发生类似反应,得到 4-methyl-3-methylcarbamoyl-1-phenyl (or m-chlorophenyl) pyrano [2, 3-c] pyrazol-6 (1H)-ones (Xa, b),收率为 17.4-30%。新合成的吡喃并[2,3-c]吡唑(Xa、Xb、XII)通过两种方法对小鼠进行了镇痛活性测试。