反应详情

温度

40 °C

To a solution of 1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehyde oxime (8 mg, 0.039 mmol) in DMF (1.0 mL) at rt was added NCS (6.2 mg, 0.047 mmol). The reaction mixture was stirred for 2 h, warmed to 40° C. and stirred for 3 h. The mixture was cooled to rt, poured into ice-water (10 mL) and extracted with EA (20 mL). The organic layer was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure to give N,1-dihydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbimidoyl chloride (8 mg; yield 86%) as a white solid. 1H NMR (400 MHz, CDCl3): δ 12.50 (s, 1 H), 7.90 (s, 1 H), 7.70-7.79 (m, 2 H), 1.61 (s, 6 H) ppm.

1. stirringstirred for 3 h
2. temperatureThe mixture was cooled to rt
3. extractionextracted with EA (20 mL)
4. washThe organic layer was washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure