Preparation of...

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C - Chemistry, Metallurgy

07

J

C07J 71/00 (2006.01)

Patent

CA 2238691

A process for preparing the compound (11.beta., 16.beta.)-21-(acetyloxy)-11- hydroxy-2'-methyl-5'H-pregna-1,4-dieno[17,16-d]oxazole-3,20- dione (deflazacort) which comprises reacting (11.beta.,16.beta.)-11,21- dihydroxy-2'-methyl-5'H-pregna-1,4-dieno[17,16-d]oxazole-3,20-dione with acetic anhydride in a suitable organic solvent in the presence of a basic catalyst and water.

On décrit un procédé de préparation du composé (11 beta ,16 beta )-21-(acétyloxy)-11-hydroxy-2'-méthyl-5'H-pregna-1,4-diéno[17,16-d]oxazole-3,20-dione ("déflazacort"), lequel consiste à faire réagir une (11 beta ,16 beta )-11,21-dihydroxy-2'-méthyl-5'H-prégna-1,4-diéno[17,16-d]oxazole-3,20-dione avec de l'anhydride acétique, dans un solvant organique approprié et en présence d'un catalyseur basique et d'eau.

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