Benzoyl chloride → 6-bromo-2-phenyl-4H-benzo[d][1,3]oxazin-4-one
反応式
[NH2:1][C:2]1[CH:10]=[CH:9][C:8]([Br:11])=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].[C:12](Cl)(=O)[C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>>[Br:11][C:8]1[CH:9]=[CH:10][C:2]2[N:1]=[C:12]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[O:5][C:4](=[O:6])[C:3]=2[CH:7]=1参加物
3
実験手順
The 2-amino-5-bromobenzoic acid (5 g, 23.1 mmol) was treated with benzoyl chloride (237 mL, 2.04 mol) at 140° C. for 3 h. After the reaction mixture was cooled to rt, the crystals that formed were collected by filtration and were washed with hexanes to provide 64 as light brown needles (6.8 g, 97%): 1H NMR (CDCl3) δ 7.51-7.2 (m, 4H), 7.9 (dd, 1H, J=2.3, 8.6 Hz), 8.30-8.33 (m, 2H), 8.8 (d, 1H, J=2.2 Hz); 13C NMR (CDCl3) δ 158.19, 157.35, 145.75, 139.58, 132.82, 130.97, 129.77, 128.82, 128.73, 128.29, 121.37, 118.27; MS (EI) m/e (relative intensity) 303 (M+, 36), 301 (M+, 36), 259 (14), 257 (14), 226 (6), 224 (6), 178 (9), 170 (9), 168 (9), 151 (4), 105 (100).
後処理
- customthe crystals that formed
- filtrationwere collected by filtration