| abstract |
The present invention provides an intermediate and a method for producing the same in the production of an isothiazole derivative useful as a cancer therapeutic agent. A process for producing a compound of formula II and a pharmaceutically acceptable salt thereof from a corresponding specific amino group-containing raw material compound. [Wherein R 1 represents a hydrogen atom or the like, R 2 represents an alkoxy group or the like, and R 3 and R 8 represent a hydrogen atom, an alkyl group or the like. ] [Selection figure] None |