反应详情

To a suspension of the product obtained in Step 1 (4.9 g) in acetone (40 ml) was added diphenyldiazomethane (8.2 g), and the mixture was stirred overnight at room temperature. After filtering off the insoluble matters, the filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography, giving 2.94 g of the objective compound as yellow crystals.

1. filtrationAfter filtering off the insoluble matters
2. concentrationthe filtrate was concentrated under reduced pressure
3. customthe residue was purified by silica gel column chromatography