Process for obtaining pure oseltamivir

Details Process for obtaining pure oseltamivir Process for obtaining pure oseltamivir

2006-01-02

2010-06-08

Zucker, Paul A (Department: 1621)

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

Organic compounds

Carboxylic acid esters

Reexamination Certificate

active

07732632

ABSTRACT:
The present invention provides a process for obtaining highly pure crystalline form of oseltamivir free base, thus, for example, suspending or dissolving impure or non-crystalline oseltamivir free base in a hydrocarbon solvent and then isolating crystals to obtain oseltamivir free base in well defined crystalline form. The present invention also provides a process for preparation of oseltamivir phosphate in high purity.

REFERENCES:
patent: 2004/0180933 (2004-09-01), Brown et al.
patent: WO9807685 (1998-02-01), None
John C. Rohloff, et al. Practical Total Snythesis of the Anti-Influenza Drug GS-4104, J. Org. Chem. 1998, 63, 4545-4559, Glead Sciences Inc. Process Chemistry, 353 Lakeside Drive, Foster city, California 94404, Received Feb. 23, 1998.
PCT Notification of Transmittal of The International Search Report and The Written Opinion of the International Searching Authority, or the Declaration.

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