反应详情

To a solution of crude methyl 4-(2-benzenecarbonylamino-ethoxy)benzoate (0.5 mmol) in a 1:1 mixture of THF/methanol (20 ml) was added 50 wt. % aqueous hydroxylamine (3 ml) followed by 1M aqueous NaOH (1 ml) adjusting the pH between 10-11. The reaction mixture was stirred for 14 h, neutralized to pH=7-8 with 6 M aqueous HCl and concentrated in vacuo. The precipitate was collected and purified by HPLC providing the title compound as a white solid. 1H NMR (DMSO-d6): δ 8.69 (t, J=5.8 Hz, 1H), 7.83 (d, J=7.5 Hz, 2H), 7.69 (d, J=9.1 Hz, 2H), 7.46 (m, 3H), 6.99 (d, J=9.1 Hz, 2H), 4.16 (t, J=5.8 Hz, 2H), 3.63 (q, 5.8 Hz, 2H). EM (calc.): 300.1; MS (ESI) m/e: 301.1 (M−1)+, 299.0 (M+1)−.

1. concentrationconcentrated in vacuo
2. customThe precipitate was collected
3. custompurified by HPLC