IMPROVED PROCESS FOR THE MANUFACTURE OF CITALOPRAM HYDROBROMIDE

IMPROVED PROCESS FOR THE MANUFACTURE OF CITALOPRAM HYDROBROMIDE

The present invention describes an improved process for the preparation of pure 1-(4'-Fluorophenyl)-1-(3-dimethylaminopropyl)-5-phthalanecarbonitrile and its bromide salt (citalopram hydrobromide), which is a well known antidepressant. Another aspect of the invention is isolation of crystalline...

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Bibliographische Detailangaben
Hauptverfasser: BHARGAV, KRISHNAJI UPADHYE, JAWEED MUKARRAM, SIDDIQUI MOHAMMED, FAROOQUI, MOHAMMED ISMAIL, MISHRA, KRISHNA GOPALJI
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:The present invention describes an improved process for the preparation of pure 1-(4'-Fluorophenyl)-1-(3-dimethylaminopropyl)-5-phthalanecarbonitrile and its bromide salt (citalopram hydrobromide), which is a well known antidepressant. Another aspect of the invention is isolation of crystalline (4-Bromo-2-hydroxymethyl)phenyl-(4-fluorophenyl)-3-(dimethylaminopropyl)methanol (Bromodiol) and conversion of desmethylcitalopram which is formed during the cyanide exchange reaction, to citalopram by heating with a mixture of formaldehyde and formic acid in chloroform. The resulting citalopram is purified using conventionally extraction methodology.