申请人:ISHIHARA SANGYO KAISHA, LTD.
公开号:EP0548855A1
公开(公告)日:1993-06-30
A method for producing a dichloromethylpyridine of the formula (II):
wherein each of R¹, R², R³ and R⁴ 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 R¹, R², R³ and R⁴ are not simultaneously hydrogen atoms, which comprises reacting a trichloromethylpyridine of the formula (I):
wherein R¹, R², R³ and R⁴ 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.
一种生产式 (II) 的二氯甲基吡啶的方法:
其中相互独立的 R¹、R²、R³ 和 R⁴ 各为氢原子、卤素原子、烷氧基或可被取代的苯氧基,但 R¹、R²、R³ 和 R⁴ 不能同时为氢原子,该方法包括使式 (I) 的三氯甲基吡啶反应:
其中 R¹、R²、R³ 和 R⁴ 如上定义,与还原剂反应,其中
(1) 使用亚磷酸二烷基酯或亚磷酸三烷基酯作为还原剂,反应在碱性物质和醇类溶剂存在下进行,或
(2) 使用三烷基膦或三苯基膦作为还原剂,并在醇溶剂存在下进行反应。