Réaction #42655

Équation de réaction

(11β,16β)-21-(acetyloxy)-9-fluoro-11-hydroxy-16-methyl-3,20-dioxopregna-1,4-dien-17-yl (1R)-1-phenylethylcarbamate

→

(11β,16β)-9-fluoro-11,21-dihydroxy-16-methyl-3,20-dioxopregna-1,4-dien-17-yl (1R)-1-phenylethylcarbamate

Rendement 57.9%

Solvants

—

pre-mixed solution

methanol chloroform

Conditions de réaction

Traitement

1. 1
   AutreThe solution was then partitioned between ethyl acetate and water
2. 2
   Lavagethe organic phase was washed with water (twice) and brine
3. 3
   Séchagedried over Na2SO4
4. 4
   FiltrationFiltration and evaporation under vacuum
5. 5
   Autregave a white film which
6. 6
   Autrewas purified by preparative thin layer chromatography on silica gel
7. 7
   Lavageeluting with ethyl acetate/hexane/dichloromethane/methanol (95:95:95:15)

Mode opératoire

(11β,16β)-21-(acetyloxy)-9-fluoro-11-hydroxy-16-methyl-3,20-dioxopregna-1,4-dien-17-yl (1R)-1-phenylethylcarbamate (42 mg, 0.064 mmol) was dissolved in 1.25 mL of a pre-mixed solution of methanol/chloroform/6N HCl (10:2:1) and stirred at room temperature for 24.5 hours. The solution was then partitioned between ethyl acetate and water and the organic phase was washed with water (twice) and brine and dried over Na2SO4. Filtration and evaporation under vacuum gave a white film which was purified by preparative thin layer chromatography on silica gel, eluting with ethyl acetate/hexane/dichloromethane/methanol (95:95:95:15), to yield 20 mg of (11β,16β)-9-fluoro-11,21-dihydroxy-16-methyl-3,20-dioxopregna-1,4-dien-17-yl (1R)-1-phenylethylcarbamate as a white solid.

Source