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With sodium tetrahydroborate; iodine; In tetrahydrofuran; at 20 - 66℃; for 6h;
500 mg (1.9 mmol) of <strong>[2875-79-8]N,N-diphenyl-1-imidazolecarboxamide</strong> was added to a 50 mL round bottom flask, and dissolved in 20 mL of THF.359 mg (9.5 mmol) of sodium borohydride and 482 mg (1.9 mmol) of iodine were added thereto under stirring at room temperature, and the mixture was transferred to an oil bath at 66 C to reflux.The reaction progress was detected by TLC, and the reaction liquid was completely obtained after the reaction for 6 hours.Then, the obtained reaction liquid was washed with 5% hydrochloric acid, water, 5% sodium hydroxide and water in an ice bath, and after washing, it was extracted twice with 50 mL of dichloromethane, and the organic layer was washed with saturated brine. Dry with anhydrous sodium sulfate. The dried solution is then steamed to remove the solution.And the crude product is separated and purified by column chromatography.The target product N-methyldiphenylamine 271 mg was obtained in a yield of 78%.