Processes for preparing clarithromycin polymorphs

Details Processes for preparing clarithromycin polymorphs Processes for preparing clarithromycin polymorphs

2006-01-17

2006-01-17

Peselev, Elli (Department: 1623)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C536S018500

Reexamination Certificate

active

06987175

ABSTRACT:
The present invention relates to processes for converting clarithromycin Form I to clarithromycin Form II, which include slurrying clarithromycin the Form I in water. The present invention also relates to processes for the preparation of clarithromycin Form II by converting erythromycin A to clarithromycin and thereafter converting clarithromycin Form I to clarithromycin Form II by slurrying.

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Chemical Modification of Erythromycins. IX' Selective Methylation at the C-6 Hydroxyl Group of Erythromycin A Oxime Derivatives and Preparation of Clarithromycin: Yoshiaki Watanabe, Shigeo Morimoto, Takashi Adachi, Masato Kashimura and Toshifumi Asaka, Research Center, Taisho Pharmaceutical Co., Ltd. 1-403 Yoshino-cho, Ohmiya-shi, Saitama 330, Japan; vol. 46 No. 4, The Journal of Antibotics, pp. 647-860.

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