反应详情

n-Butyl lithium(1.6 M in hexane solution, 8.0 ml, 12.88 mmol) was added slowly to a solution of N1-benzyl-4-bromo-2-methoxybenzamide (1.65 g, 5.15 mmol) in tetrahydrofuran (40 mL) at −78° C. After 30 minutes, triisopropyl borate (1.8 mL, 7.73 mmol) was added rapidly. The reaction mixture was allowed to warm up to room temperature after 13 minutes and stirred for 16 hours. Hydrochloric acid (2.5N, 36 mL) was added and the mixture was stirred overnight. Organic solvent was removed and the aqueous layer was extracted with ethyl acetate. The combined organic layer was washed with brine, dried over MgSO4, filtered and concentrated. The residue was purified by flash column chromatography using dichloromethane/methanol (95:5) as mobile phase to give 4-[(benzylamino)carbonyl]-3-methoxyphenylboronic acid (0.675 g, 46%). 1H NMR (DMSO-d6) δ 3.90 (s, 3H), 4.51 (d, J=6.18 Hz, 2H), 7.24 (m, 1H), 7.34 (m, 4H), 7.43 (d, J=7.55 Hz, 1H), 7.59 (s, 1H), 7.69 (d, J=7.55 Hz, 1H), 8.23 (s, 2H), 8.69 (m, 1H).

1. stirringthe mixture was stirred overnight
2. customOrganic solvent was removed
3. extractionthe aqueous layer was extracted with ethyl acetate
4. washThe combined organic layer was washed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue was purified by flash column chromatography