反应详情

Intermediate 88 (375 mg) was dissolved in concentrated sulfuric acid (2 ml), then added with potassium nitrate (260 mg) with ice cooling and stirred for 2 hours. The reaction mixture was added with 28% aqueous ammonia (10 ml) and extracted twice with ethyl acetate (15 ml for each time). The organic layer was dried over anhydrous sodium sulfate, and then the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=1:1) to obtain the title compound (332 mg).

1. extractionextracted twice with ethyl acetate (15 ml for each time)
2. dry with materialThe organic layer was dried over anhydrous sodium sulfate
3. customthe solvent was evaporated under reduced pressure
4. customThe residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=1:1)