The present invention provides an intermediate compound for preparing a 2-substituted-3-ethylsulfonylpyridine compound, and a novel process for preparing the 2-substituted-3-ethylsulfonylpyridine compound. The present invention provides also a process for preparing a compound represented by formula (2), which comprises a step (a): a step of reacting of 3-ethylsulfonylpyridine N-oxide with a compound represented by formula (1) (wherein X represents a chlorine atom etc., Q represents a C1-3 alkoxy group optionally substituted with one or more fluorine atoms, etc.) in the presence of one or more compounds selected from Group P, a carboxylic acid or a carboxylate salt, a base, and a palladium compound or a nickel compound in a solvent to obtain a compound represented by formula (2), Group P: a group consisting of the following compounds: a compound represented by formula (4): R3P (wherein R represents an alkyl group having 1 to 6 carbon atoms, etc.), etc.; as well as a process for preparing a compound represented by formula (3), which comprises the step (a) and a step (b) : a step of subjecting the compound represented by formula (2) to a reduction reaction to obtain the compound represented by formula (3).
本发明提供了一种制备 2-取代-3-乙基磺酰基
吡啶化合物的中间体化合物,以及一种制备 2-取代-3-乙基磺酰基
吡啶化合物的新工艺。本发明还提供了一种制备由式(2)代表的化合物的工艺,该工艺包括步骤(a):3-乙基磺酰基
吡啶 N-氧化物与由式(1)代表的化合物反应的步骤(其中 X 代表
氯原子等、Q 代表任选被一个或多个
氟原子取代的 C1-3 烷氧基等)在一种或多种选自 P 组的化合物、
羧酸或
羧酸盐、碱和
钯化合物或
镍化合物存在下,在溶剂中反应,得到式(2)代表的化合物,P 组:由下列化合物组成的一组:式(4)代表的化合物:R3P(其中 R 代表具有 1 至 6 个碳原子的烷基等)等;以及制备式(3)所代表的化合物的工艺,其包括步骤(a)和步骤(b):将式(2)所代表的化合物进行还原反应以得到式(3)所代表的化合物的步骤。