反应详情

Iodomethane (125 uL, 2.0 mmol) was added to a mixture of the methyl 4-amino-2-methyl-3-nitrobenzoate (400 mg, 1.9 mmol) and sodium hydride (60% oil dispersion, 84 mg, 2.1 mmol) in tetrahydrofuran (10 mL) at 0° C. The reaction mixture was slowly warmed to room temperature and stirred for 18 hours. The reaction mixture was quenched with saturated aqueous ammonium chloride solution and extracted with ethyl acetate. The combined extract was washed with water (2×30 mL), brine (30 mL), dried over sodium sulfate, filtered and concentrated, then purified by flash chromatography (25% ethyl acetate in hexanes) to give methyl 2-methyl-4-(methylamino)-3-nitrobenzoate (308 mg, 72% yield). 1H NMR (400 MHz, CDCl3): 7.94 (d, 1H), 6.63 (d, 1H), 5.68 (br, 1H), 3.86 (d, 2H), 2.58 (s, 3H); MS (EI) for C10H12N2O4: 225 (MH+).

1. customThe reaction mixture was quenched with saturated aqueous ammonium chloride solution
2. extractionextracted with ethyl acetate
3. extractionThe combined extract
4. washwas washed with water (2×30 mL), brine (30 mL)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated
8. custompurified by flash chromatography (25% ethyl acetate in hexanes)