反应详情

A total of 2.23 grams of commercially available undecanoyl chloride were added to a stirred solution of 1.58 grams of (7α,17β)-17-hydroxy-7-methylestr-4-en-3-one at 0-5° C. The reaction mixture was allowed to reach room temperature and stirred overnight. Thereafter, ice was added and after stirring for another 2 hours the reaction mixture was poured into ice-water, containing 4 ml of conc. H2SO4, followed by ethyl acetate extraction. The organic layers were washed with water, cold 1 N NaOH solution and brine, dried on sodium sulfate, filtered and evaporated in vacuo. The residue was chromatographed over silica Elution with heptane-ethylacetate (4:1) and evaporation gave a greasy solid that was collected. Yield 1.42 g, [α]D20=+36° (c=1; dioxane), MS (ESI): 456.

1. customto reach room temperature
2. additionThereafter, ice was added
3. stirringafter stirring for another 2 hours the reaction mixture
4. extractionfollowed by ethyl acetate extraction
5. washThe organic layers were washed with water, cold 1 N NaOH solution and brine
6. customdried on sodium sulfate
7. filtrationfiltered
8. customevaporated in vacuo
9. customThe residue was chromatographed over silica Elution with heptane-ethylacetate (4:1) and evaporation
10. customgave a greasy solid
11. customthat was collected