反应详情

A solution of the fluorobenzoate (46, 27 mg, 0.051 mmol) in THF (2 mL) and MeOH (2 mL) was treated with 1M NaOH (0.2 mL, 0.2 mmol) and allowed to stand at ambient temperature for 7 h. After the solvent was evaporated, the residue was treated with CHCl3 (40 mL) and 10% Na2CO3 solution (30 mL); we then separated the layers, dried the organic layer over MgSO4, and filtered and evaporated it under reduced pressure. Purified on 2 g of Merck grade 60 flash silica gel using MeOH/CHCl3 (5:95) afforded 13 mg (60%) of 25-fluoro-3β-ol (47), mp 196°-198° C. EIMS (m/z): 428 (M+H), 413 (M-M3). 1H NMR: δ3.70 (m, 1H), 1.49 (s, 3H), 1.27 (s, 3H), 1.09 (s, 3H), 1.02 (d, 3H, J=6.4 Hz), 0.81 (s, 3H).

1. customAfter the solvent was evaporated
2. additionthe residue was treated with CHCl3 (40 mL) and 10% Na2CO3 solution (30 mL)
3. customwe then separated the layers
4. dry with materialdried the organic layer over MgSO4
5. filtrationfiltered
6. customevaporated it under reduced pressure
7. customPurified on 2 g of Merck grade 60 flash silica gel