Hydrochloric Acid → N-(1,1-Dimethyl-2-methylthioethyl)-N'-[2-methyl-4-[1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl]phenyl]phthalamide

関与物質

反応手順

A mixture of 2-methyl-1-methylthio-2-propanamine (11.61 g) and triethylamine (1.97 g) was added dropwise to a mixture of phthalic anhydride (14.42 g) and 1,2-dichloroethane (58 mL) at 50° C. The resulting mixture was stirred at the same temperature for 30 minutes to prepare N-[1,1-dimethyl-2-(methylthio)ethyl]phthalamic acid. Aqueous sodium hydrogencarbonate solution (9.81 g/101 mL) was added dropwise to this mixture at 40° C. and then methyl chloroformate (11.04 g) was added dropwise thereto at the same temperature. After completion of the dropwise addition, the reaction mixture was stirred at 50° C. for 1 hour and the organic layer was separated to prepare a solution of N-[1,1-dimethyl-2-(methylthio)ethyl]isophthalimide in 1,2-dichloroethane. This solution was added dropwise to a mixture of 2-methyl-4-[1,2,2,2-tetrafluoro-1-(trifluoro-methyl)ethyl]aniline (25.45 g), concentrated hydrochloric acid (0.49 g) and 1,2-dichloroethane (14.4 mL) at 60° C., and then stirred at 65° C. for 30 minutes. The reaction mixture was cooled and then neutralized with an aqueous sodium hydrogencarbonate solution, after which the organic layer was separated. The organic layer obtained was concentrated under reduced pressure, and the crystals precipitated were filtered, washed with water and then dried to obtain 47.06 g (yield 92%) of the title compound.

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