反应详情

温度

25 °C

Commercially available 2-amino-9-fluorenone 1 (10 mmol) was dissolved in 100 mL of methanol and 0.38 g (10 mmol) of sodium borohydride was added. The mixture was stirred at 25° C. for 1 h and concentrated to dryness under vacuum. The residue was suspended in 100 mL of saturated aqueous NaHCO3− and extracted with ethylacetate (100 mL). The ethylacetate layer was concentrated under vacuum and the residue was crystallized from ethylacetate/hexane (2:1) to afford 1.4 g of pure 2-amino-9-hydroxyfluorene 2.

1. concentrationconcentrated to dryness under vacuum
2. extractionextracted with ethylacetate (100 mL)
3. concentrationThe ethylacetate layer was concentrated under vacuum
4. customthe residue was crystallized from ethylacetate/hexane (2:1)