Preparation of (11.beta.,16.beta.)-21-(3-carboxy-1-oxopropoxy)-11-hydroxy-2'-methyl-5'H-pregna-1,4-dieno [17,16-D]oxazole-3,20-dione
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United States of America Patent
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Jul 9, 2002
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N/A
app pub date -
Jan 20, 2000
filing date -
Dec 13, 1995
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Abstract
A process for preparing the compound (11.beta.,16.beta.)-21-(3-CARBOXY-1-OXOPROPOXY)-11-HYDROXY-2'-METHYL-5'H-PREGNA-1,4-DIENO(17,16-D) OXAZOLE-3,20-DIONE which comprises reacting the compound (11.beta.,16.beta.)-11,21-DIHYDROXY-2'-METHYL-5'H-PREGNA-1, 4-DIENO(17,16-D)OXAZOLE-3,20-DIONE with succinic anhydride in a (C.sub.1 -C.sub.4) alkyl ester of a (C.sub.1-C.sub.4) carboxylic acid as solvent, in the presence of a basic catalyst.
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