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    • 63. 发明专利
    • Preparation of 2-methyl-3-pyrazolidone
    • 2-甲基-3-吡咯烷酮的制备
    • JPS6156161A
    • 1986-03-20
    • JP17784484
    • 1984-08-27
    • Nissan Chem Ind Ltd
    • SUZUKI HIDEOBABA MASANORITANAKA NORIOSUZUKI FUMIO
    • C07D231/08C07C67/00C07C253/00C07C255/66C07D257/08
    • PURPOSE: To obtain the titled compound useful as a synthetic intermediate of penicillin, antiobesity agent, anti-enzymatic agent, etc., easily, in high yield, from an inexpensive raw material, by the hydrolytic cyclization of N-methyl, N'-β-cyanoethyl-hydrazine.
      CONSTITUTION: The objective compound of formula II can be prepared by the hydrolytic cyclization of novel N-methyl, N'-β-cyanoethyl-hydrazine of formula I in the presence of water, using a mineral acid, preferably hydrochloric acid, sulfuric acid, nitric acid, etc., at the refluxing temperature of water. The starting compound of formula I can be produced by the hydrogenation of formaldehyde β-cyanoethylhydrazone, 1,4-di(β-cyanoethyl)hexahydro-1,2,4,5-tetrazine or their mixture.
      COPYRIGHT: (C)1986,JPO&Japio
    • 目的:为了从廉价的原料中轻松地以高产率获得用作青霉素,抗肥胖剂,抗酶剂等的合成中间体的标题化合物,通过N-甲基-N'- β-氰基乙基肼。 构成:式II的目标化合物可以通过在水存在下,使用无机酸,优选盐酸,硫酸,水解环化的式I的新型N-甲基,N'-半胱氨酸 - 肼, 硝酸等,在水的回流温度下。 式I的起始化合物可以通过甲醛β-氰乙基腙,1,4-二(β-氰基乙基)六氢-1,2,4,5-四嗪或其混合物的氢化来制备。