Synthesis of cisapride
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Apr 14, 1999
filing date -
Oct 15, 1996
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Expired
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Abstract
A new Process of preparing cisapride, and the pharmaceutically acceptable acid addition salts thereof, by reductively aminating 1-[3-(4-fluorophenoxy)-propyl]-3-methoxy-4-piperidinone in the presence of benzylamine under hydrogen in a reaction-inert solvent, yielding 1-[3-(4-fluorophenoxy)-propyl]-3-methoxy-4-piperidinamine having a cis/trans ratio of about 93/7, which is enriched in the amount of cis-stereoisomer by converting it into its acid addition salt, by treatment with a suitable inorganic acid, in an appropriate solvent, subsequent crystallisation and conversion to its free base form by treatment with an appropriate base, yielding 1-[3-(4-fluorophenoxy)-propyl]-3-methoxy-4-piperidinamine having a cis/trans ratio of equal to or higher than 98/2.
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