申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:US20200385361A1
公开(公告)日:2020-12-10
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): R
3
P (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,以及一种新的制备2-取代-3-乙基磺酰基吡啶化合物的方法。本发明还提供了一种制备由公式(2)表示的化合物的方法,其中包括步骤(a):将3-乙基磺酰基吡啶N-氧化物与由公式(1)表示的化合物(其中X表示氯原子等,Q表示可选地取代有一个或多个氟原子的C1-3烷氧基等)在溶剂中,与来自P组中选择的一个或多个化合物,包括羧酸或羧酸盐,碱,钯化合物或镍化合物反应,以得到由公式(2)表示的化合物。P组:由以下化合物组成的一组化合物:由公式(4)表示的化合物:R3P(其中R表示具有1至6个碳原子的烷基等)。本发明还提供了一种制备由公式(3)表示的化合物的方法,其中包括步骤(a)和步骤(b):将由公式(2)表示的化合物进行还原反应,以得到由公式(3)表示的化合物。