Clarithromycin formate → Clarithromycin

Beteiligte Stoffe

Reaktionsschritte

Specifically, clarithromycin formate is dissolved in a mixture of water and a water-miscible organic solvent at a temperature in the range of room temperature to the boiling point of the solvent for a period sufficient to make a solution. Then, the solution is filtered and a base is added to the filtrate to neutralize and make pH of the solution 7 to 12. The solution may then be optionally kept at a temperature ranging from room temperature to the boiling point of the solvent for 10 minutes to 1 hour. The resulting solution is cooled to a temperature in the range of −20° C. to room temperature with or without stirring for a period sufficient to precipitate Form II crystals of clarithromycin. Finally, the precipitated crystals are filtered and dried in a conventional manner to give Form II crystals of clarithromycin.

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