反应详情

N-Benzylmaleimide (5.0 g, 26.7 mmol), and N-(methoxymethyl)-N-(trimethylsilylmethyl) benzylamine (7.0 g, 29.4 mmol) were dissolved in toluene (150 mL). Trifluoroacetic acid (500 μL, 6.5 mmol) was added at room temperature. The reaction was allowed to stir for two hours at room temperature, and the precipitate was filtered off (˜440 mg). The filtrate was concentrated and purified by silica gel column chromatography (20-50% ethyl acetate in hexanes) to afford a white solid (6.2 g, 72%). 1H NMR (400 MHz, CDCl3): δ 7.22-7.05 (m, 8H), 7.01-6.96 (m, 2H), 4.45 (s, 2H), 3.95 (s, 2H), 3.50 (d, J=11.0 Hz), 3.37 (d, J=8.8 Hz), 3.10 (app t, J=9.1 Hz); 13C NMR (400 MHz, CDCl3): δ 175.8 (C═O), 134.8 (Ph), 130.6 (Ph), 129.6 (Ph), 129.3 (Ph), 128.8 (Ph), 128.6 (Ph), 128.3 (Ph), 127.7 (Ph), 57.3 (CH2), 54.0 (CH2), 42.9 (CH), 42.6 (CH2).

1. filtrationthe precipitate was filtered off (˜440 mg)
2. concentrationThe filtrate was concentrated
3. custompurified by silica gel column chromatography (20-50% ethyl acetate in hexanes)