Process for production of sulfoxide derivatives or salts thereof in the amorphous state

摘要

A process for producing sulfoxide derivatives or salts thereof in the amorphous state, characterized by heat-drying solvated crystals of a sulfoxide derivative or a salt thereof represented by the general formula (I): wherein R₁ represents a hydrogen atom, a methoxy group, or a difluoromethoxy group; R₂ represents a methyl group or a methoxy group; R₃ represents a 3-methoxypropoxy group, a methoxy group, or a 2,2,2-trifluoroethoxy group; R₄ represents a hydrogen atom or a methoxy group; and B represents a hydrogen atom, an alkali metal or ½ alkaline earth metal.