反应详情

To DIPEA (7.48 mL, 42.8 mmol) and (1S)-1-[2-bromo-5-(trifluoromethyl)phenyl]pent-4-en-1-amine (4.4 g, 14.3 mmol) in DCM (20 mL) was added benzyl chloroformate at 0° C. The reaction was stirred at room temperature for 2 hours and was quenched with water. The organic was washed with 10% aqueous KOH and the aqueous was back-extracted with ethyl acetate. The combined organics were dried over sodium sulfate, filtered, concentrated and then purified by column chromatography to yield benzyl {(1S)-1-[2-bromo-5-(trifluoromethyl)phenyl]pent-4-en-1-yl}carbamate (5.8 g, 13.1 mmol). 1H NMR (500 MHz, CDCl3) δ 7.72 (m, 1H), 7.58 (s, 1H), 7.39 (b, 5H), 7.1 (m, 1H), 5.83 (m, 1H), 5.3 (b, 1H), 5.15 (m, 3H), 2.22 (m, 1H), 2.18 (m, 1H), 1.95 (m, 1H), 1.78 (m, 1H).

1. customwas quenched with water
2. washThe organic was washed with 10% aqueous KOH
3. extractionthe aqueous was back-extracted with ethyl acetate
4. dry with materialThe combined organics were dried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by column chromatography