反应详情

温度

110 °C

N-Boc-2-bromobenzylamine (7.15 g, 25 mmol) was dissolved into tributylamine (12 mL) and degassed under vacuum. Palladium acetate (224 mg, 1 mmol) and tri-o-tolylphosphine (608 mg, 2 mmol) was then added and the mixture degassed under vacuum. Trans-ethylcrotonate (6.25 mL, 50 mmol) was then added and the mixture was degassed with nitrogen. The tube was sealed and the mixture was heated to 110° C. for 48 h. The solution was cooled to room temperature, diluted with diethyl ether (200 mL) and filtered through celite. The solution was washed with 1N HCl (2×50 mL) and brine (50 mL) dried over magnesium sulfate and concentrated to dryness. Flash chromatography (9:1 hexanes/ethyl acetate) gave the title compound as a yellow oil (1.6 g, 20%). 1H NMR 7.22-7.37 (m, 3H), 7.08 (dd, J=7.4, 1.6 Hz, 1H), 5.75 (d, J=1.3 Hz, 1H), 4.29-4.31 (m, 2H), 4.20 (q, J=7.1 Hz, 2H), 2.45 (d, J=1.3 Hz, 3H), 1.44 (s, 9H), 1.30 (t, J=7.1 Hz, 3H).

1. customdegassed under vacuum
2. customthe mixture degassed under vacuum
3. customthe mixture was degassed with nitrogen
4. customThe tube was sealed
5. temperatureThe solution was cooled to room temperature
6. additiondiluted with diethyl ether (200 mL)
7. filtrationfiltered through celite
8. washThe solution was washed with 1N HCl (2×50 mL) and brine (50 mL)
9. dry with materialdried over magnesium sulfate
10. concentrationconcentrated to dryness