Ethanol → 6-methyl-N1-(3-(trifluoromethyl)phenyl)isoquinoline-1,5-diamine

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6-Methyl-5-nitro-N-(3-(trifluoromethyl)phenyl)isoquinoline-1-amine (1.49 g, 4.29 mmol) obtained in Step (1) above was stirred in a solvent of ethanol (10 mL). The reaction solution was added with tin chloride (II) dihydrate (4.06 g, 21.46 mmol), and stirred for about 5 hours at 90° C. The reaction mixture was diluted with ethyl acetate, and washed with a saturated aqueous sodium bicarbonate solution and saline. The organic layer thus obtained was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure to obtain the title compound (0.42 g, 31%).

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