Method for producing dichloromethylpyridines
    3.
    发明授权
    Method for producing dichloromethylpyridines 失效
    二氯甲基吡啶的制备方法

    公开(公告)号:US5290944A

    公开(公告)日:1994-03-01

    申请号:US990276

    申请日:1992-12-14

    CPC分类号: C07D213/26 C07D213/61

    摘要: A method for producing a dichloromethylpyridine of the formula (II): ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 which are independent of one another, is a hydrogen atom, a halogen atom, an alkoxy group or a phenoxy group which may be substituted, provided that R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are not simultaneously hydrogen atoms, which comprises reacting a trichloromethylpyridine of the formula (I): ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined above, with a reducing agent, wherein:(1) a dialkyl phosphite or a trialkyl phosphite is used as the reducing agent, and the reaction is conducted in the presence of a basic substance and an alcohol solvent, or(2) a trialkyl phosphine or triphenyl phosphine is used as the reducing agent, and the reaction is conducted in the presence of an alcohol solvent.

    摘要翻译: 制备式(II)的二氯甲基吡啶的方法:(*化学结构*)(II)其中R 1,R 2,R 3和R 4彼此独立地为氢原子,卤素原子,烷氧基 基团或可被取代的苯氧基,条件是R 1,R 2,R 3和R 4不同时为氢原子,其包括使式(I)的三氯甲基吡啶:(*化学结构*)(I) ,R3和R4如上定义,与还原剂反应,其中:(1)亚磷酸二烷基酯或亚磷酸三烷基酯用作还原剂,反应在碱性物质和醇溶剂的存在下进行, 或(2)使用三烷基膦或三苯基膦作为还原剂,反应在醇溶剂的存在下进行。