反应详情

温度

50 °C

A mixture of 4 (17.88 g, 43 mmol) and 10% aqueous sodium hydroxide solution (860 mL) in tetrahydrofuran (500 mL) was stirred at 50° C. for 5 days. The mixture was cooled to 0° C. and neutralized with concentrated hydrochloric acid. The mixture was concentrated under reduced pressure, and the product was extracted with ethyl acetate. The organic layer was dried over sodium sulfate, filtered and concentrated to give tert-butyl 4-bromo-7-hydroxynaphthalen-1-ylcarbamate (5). (14.32 g, 98% yield)

1. concentrationThe mixture was concentrated under reduced pressure
2. extractionthe product was extracted with ethyl acetate
3. dry with materialThe organic layer was dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated