反应详情

A solution of 6-bromo-8-methoxy-4,4-dimethyl-3,4-dihydro-2H-naphthalen-1-one (Intermediate 64, 1.08 g, 3.81 mmol) in dichloromethane (8 mL) and acetonitrile (4 mL) was treated with cyclopropyl amine (5 mL, 72.3 mmol). After 5 minutes, acetic acid (5 mL) was added followed by sodium cyanoborohydride (0.96 g, 15.26 mmol). The reaction mixture was stirred for 2 days at ambient temperature. It was then diluted with water and saturated aqueous sodium carbonate solution and extracted with ethyl acetate. The combined organic extract was dried over anhydrous sodium sulfate, filtered and evaporated in vacuo to an oil. The oil was dissolved in acetone (20 mL) and treated with potassium carbonate (1.58 g, 11.43 mmol) followed by methyl iodide (2.1 mL, 33 mmol) and the resulting reaction mixture was stirred overnight at ambient temperature. Diethyl ether was added and the precipitated solids were filtered off, the filtrate was evaporated in vacuo to a residue. Flash column chromatography over silica gel (230–400 mesh) using 2.5–10% ethyl acetate in hexane as the eluent afforded the title compound (1.08 g, 84%).

1. extractionextracted with ethyl acetate
2. extractionThe combined organic extract
3. dry with materialwas dried over anhydrous sodium sulfate
4. filtrationfiltered
5. customevaporated in vacuo to an oil
6. dissolutionThe oil was dissolved in acetone (20 mL)
7. customthe resulting reaction mixture
8. stirringwas stirred overnight at ambient temperature
9. filtrationthe precipitated solids were filtered off
10. customthe filtrate was evaporated in vacuo to a residue