反应详情

To a solution of 3α-hydroxy-21-bromo-5β-pregnan-20-one (300 mg, 0.76 mmol) in DMF (5 mL) was added 3-hydroxypyridine (215 mg, 2.27 mmol) and K2CO3 (313 mg, 2.27 mmol) and the mixture obtained was sired at 25° C. for 0.5 h. The reaction mixture was then poured into a separatory funnel containing water (30 mL) and the mixture was extracted with EtOAc (3×35 mL). The combined extracts were washed with water (2×25 mL) and then dried over Na2SO4. Removal of the solvent in vacuo resulted in the crude product which was purified by flash chromatography over silica gel to yield the pure 3α-hydroxy-21-(pyrid-3-yl)oxy-5β-pregnan-20-one (50 mg); mp 63-66° C.; TLC Rf (MeOH:CH2Cl2 5:95)=0.15.

1. customthe mixture obtained
2. additionThe reaction mixture was then poured into a separatory funnel
3. extractionthe mixture was extracted with EtOAc (3×35 mL)
4. washThe combined extracts were washed with water (2×25 mL)
5. dry with materialdried over Na2SO4
6. customRemoval of the solvent in vacuo
7. customresulted in the crude product which
8. customwas purified by flash chromatography over silica gel