反应详情

To a solution of 3,3,6-trimethylbenzo[c][1,2]oxaborol-1(3H)-ol (6.87 g, 39 mmol) in CCl4 (100 mL) at rt was added benzoyl peroxide (0.944 g, 3.9 mmol) followed by NBS (13.9 g, 78 mmol). The reaction mixture was refluxed for 16 h, cooled to rt and treated with Na2CO3. The aqueous layer was acidified with 3 N HCl to pH of 3 and extracted with EA. The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography over silica gel eluted with DCM-MeOH (20:1) to give 1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-6-carbaldehyde (4.85 g; yield 65.4%) as a pale yellow solid. 1H NMR (500 MHz, CDCl3) δ 10.06 (s, 1H), 8.15 (s, 1H), 8.01 (d, J=8.0 Hz, 1 H), 7.42 (d, J=8.0 Hz, 1 H), 1.58 (s, 6H) ppm. MS: m/z=191.1 (M+1, ESI+).

1. temperatureThe reaction mixture was refluxed for 16 h
2. extractionextracted with EA
3. washThe organic layer was washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by column chromatography over silica gel
8. washeluted with DCM-MeOH (20:1)