One Spot Synthesis of Citalopram from 5-Cyanophthalide
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United States of America Patent
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Issued Date -
May 22, 2008
app pub date -
Feb 16, 2004
filing date -
Feb 16, 2004
priority date (Note) -
Abandoned
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Abstract
A process for one pot synthesis of citalopram is disclosed. The process comprises subjecting 5-cyano phthalide to Grignard reduction followed cyclization and followed by C-alkylation reaction to obtain citalopram without isolation and purification of any intermediates. In another embodiment, 5-cyano phthalide is subjected to sequential Grignard reactions followed by cyclization to obtain citalopram without isolation and purification of any intermediate stages.
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