Method for preparing 4-alkoxyalkyl-4-phenylaminopiperdines and derivatives thereof
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United States of America Patent
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Sep 8, 1992
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N/A
app pub date -
Nov 2, 1990
filing date -
Apr 20, 1989
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Abstract
The present invention is directed to a method for preparing a 4-alkoxyalkyl-4-phenylaminopiperidine compound which comprises the steps of (a) reacting an N-substituted-4-piperidone compound with an aniline compound to form a Schiff base compound, (b) reacting the Schiff base compound with an anionic reagent having an anion stabilizing group to form an amine compound, and (c) reducing the amine compound in step (b) with a reducing agent to displace the anion stabilizing group. The anionic reagent in step (b) above has the general formula: X--CYM--Z wherein X is an anion stabilizing group, Y is hydrogen or lower-alkyl, Z is lower-alkoxy or phenylmethoxy, M is an alkali or alkaline earth metal, and C is a carbon atom.
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