反应详情

To a solution of tert-butyl (1-(4-(methoxy(methyl)carbamoyl)phenyl)cyclobutyl)carbamate (0.5 g, 1 eq.) in tetrahydrofuran (THF) (5 mL) cooled to 0° C. was slowly added a 1 M solution of methylmagnesium bromide in ether (4.5 mL, 3 eq.). The reaction mixture was stirred at room temperature overnight then quenched by the addition of saturated aqueous ammonium chloride (15 mL). The mixture was extracted with dichloromethane (2×25 mL). The combined extracts were dried over sodium sulfate, filtered and concentrated under reduced pressure. The product was purified by column chromatography (15% ethyl acetate in dichloromethane), giving tert-butyl (1-(4-acetylphenyl)cyclobutyl)carbamate as a colorless oil which solidified upon standing (261 mg, 60%). 1H NMR (DMSO-d6) 400 MHz δ 7.91 (d, J=8.0 Hz, 2H), 7.74 (br. s, 1 H), 7.50 (d, J=8.4 Hz, 2H), 2.56 (s, 3H), 2.45-2.32 (m, 4H), 2.06-1.94 (m, 1H), 1.86-1.75 (m, 1H), 1.33 (s, 9H).

1. customthen quenched by the addition of saturated aqueous ammonium chloride (15 mL)
2. extractionThe mixture was extracted with dichloromethane (2×25 mL)
3. dry with materialThe combined extracts were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe product was purified by column chromatography (15% ethyl acetate in dichloromethane)