Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2011-04-05
2011-04-05
Shameem, Golam M (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C548S373100
Reexamination Certificate
active
07919633
ABSTRACT:
There is provided a process for preparation of celecoxib by reacting 4,4,4-trifluoro-1-[4-(methyl)phenyl]butane-1,3-dione with 4-sulphonamidophenylhydrazine or its salt in a solvent medium that contains an alkyl ester. There is also provided a process for the purification of celecoxib using aromatic hydrocarbon solvents.
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Letendre et al (2003): STN International HCAPLUS database, (Columbus, Ohio), Accession No. 2003:951004.
Akki Thirupathi Reddy
Alla Sampath
Anumula Raghupathi Reddy
Bojja Yakambram
Gilla Goverdhan
Dr. Reddy's Laboratories Inc.
Dr. Reddy's Laboratories Limited
Franks Robert A.
Gupta Balaram
McKenzie Thomas C.
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