9-fluoro-11beta,17-dihydroxy-16alpha-methylpregna-1,4-diene-3,20-dione 21-(9Z,12Z)-octadeca-9,12-dienoate

9-fluoro-11beta,17-dihydroxy-16alpha-methylpregna-1,4-diene-3,20-dione 21-(9Z,12Z)-octadeca-9,12-dienoate 화학적 특성, 용도, 생산

• Originator

  Topolyn ,I.S.F.,Italy,1979

• Manufacturing Process

  To a stirred solution of 9α-fluoro-11β,17,21-trihydroxy-16α-methyl-pregna1,4-diene-3,20-dione (10g, 25.5 mmol) in 20 ml pyridine and 12 ml acetone at -10°C, a cold solution of methanesulfonyl chloride (3 ml, 38.5 mmol) in 8 ml acetone was added dropwise. The addition was completed within about 3 hours and the mixture was then left standing in the cold for a further 1? hours after which 200 ml cold water were added. The resulting precipitate was separated by filtration and washed with water to give 11.5 g (96% of theoretical yield) of dexamethasone 21-mesylate, melting point 208°C to 210°C (decomposition).
  The dexamethasone 21-mesylate (11.5 g, 24.5 mmol) prepared as described was added in a nitrogen atmosphere to a stirred slurry of potassium octadecacis-9, cis-12-dienoate (7.81 g, 24.5 mmol) in 70 ml DMF. After stirring for 1? hours at 50°C and evaporating the solvent in vacuo at the same temperature, the residue was washed by slurrying it into water and was then redissolved in methylene chloride, dried and the solvent evaporated. The residue was purified by chromatography on an inactivated (10% water) silica gel column (470 g) by using an ethyl acetate/hexane mixture (7:3) to give a very good yield of an oily product.

• Therapeutic Function

  Topical antiinflammatory

9-fluoro-11beta,17-dihydroxy-16alpha-methylpregna-1,4-diene-3,20-dione 21-(9Z,12Z)-octadeca-9,12-dienoate 공급 업체

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