Preparation of...

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C - Chemistry, Metallurgy

07

J

C07J 71/00 (2006.01)

Patent

CA 2238692

A process for preparing the compound (11.beta.,16.beta.)-21-(3-carboxy-3- 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 (C1-C4)alkyl ester of a (C1-C4) carboxylic acid as solvent, in the presence of a basic catalyst.

On décrit un procédé de préparation du composé (11 beta ,16 beta )-21-(3-carboxy-3-oxopropoxy)-11-hydroxy-2'-méthyl-5'H-pregna-1,4-diéno[17,16-d]oxazole-3,20-dione, lequel consiste à faire réagir le composé (11 beta ,16 beta )-11,21-dihydroxy-2'-méthyl-5'H-pregna-1,4-diéno[17,16-d]oxazole-3,20-dione avec de l'anhydride succinique, dans un alkyle C1-4 ester d'un acide carboxylique C1-C4 en tant que solvant et en présence d'un catalyseur basique.

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