Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2006-04-25
2006-04-25
Solola, Taofiq (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
57
Reexamination Certificate
active
07034162
ABSTRACT:
The present invention relates to an amorphous form of Sumatriptan succinate of Formula (1). The present invention also relates to process for the preparation of an amorphous form of Sumatriptan succinate. The process for the preparation of an amorphous form of Sumatriptan succinate comprises refluxing an aqueous mixture of Sumatriptan or its succinate salt in alcoholic solvents such as methanol or nitrile solvents such as acetonitrile followed by evaporation of the solvent from the filtrate. The resulting residue is triturated with water immiscible aromatic or aliphatic hydrocarbon solvents such as cyclohexane to afford an amorphous form of Sumatriptan succinate.
REFERENCES:
patent: 4820833 (1989-04-01), Crisp et al.
Nicholas Cheronis , “Semimicro Experimental Organic Chemistry”, 1958, Chapter 5.
Winterbornet al., 1992, “composition”, EP 0496307 A1.
Murthy Mokkarala Suryanarayana
Prasad Achampeta Kodanda Ram
Rajan Srinivasan Thirumalai
Reddy Manne Satyanarayana
Cepeda Milagros A.
Dr. Reddy's Laboratories Inc.
Dr. Reddy's Laboratories Limited
Franks Robert A.
Pergament Edward D.
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