反应详情

Artemisinin (compound 3) (0.5 g, 1.8 mmole) in 40 mL of MeOH was cooled in an ice-bath to 0°-5° C. To the solution was added in small portions 0.25 g (6.6 mmole) of NaBH4 over a period of 30 minutes. The solution was stirred at 0°-5° C. for 2 hours after the addition of NaBH4 was complete. The solution was neutralized with 30% AcOH/MeOH and evaporated to dryness under reduced pressure. The white residue was extracted 3 times with 50 mL of EtOAc. The EtOAc extracts were combined, filtered, and evaporated to dryness to give 0.38 g (75%) of white needles mp 152°-154° C. (dec). Recrystallization from EtOAc-hexane raised the melting point to 153°-155° C. (lit. mp 153°-154° C.).

1. customevaporated to dryness under reduced pressure
2. extractionThe white residue was extracted 3 times with 50 mL of EtOAc
3. filtrationfiltered
4. customevaporated to dryness