The invention discloses an improved process for producing an intermediate to produce large quantity of 2-(Phenyl methyl thio)-3-pyridine carboxylic acid. The process comprises reacting 2-chloro-3-cyanopyridine with benzyl mercaptan in presence of a base and an aprotic solvent. The resulting intermediate 2-(phenyl methyl thio)-3-cyanopyridine is hydrolyzed in presence of a base in an autoclave and isolated under acidic condition to get the desired product.
该发明揭示了一种改进的生产过程,用于生产大量2-(苯甲
硫基)-
3-吡啶羧酸的中间体。该过程包括在碱和无极性溶剂存在下,将2-
氯-3-
氰基吡啶与
苄硫醇反应。得到的中间体2-(苯甲
硫基)-3-
氰基吡啶在高压釜中在碱的存在下
水解,并在酸性条件下分离,从而得到所需的产物。