Preparation of 4-substituted pyridines using quaternary pyridine salts
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United States of America Patent
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Jun 9, 1987
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app pub date -
Jan 16, 1985
filing date -
Jan 16, 1985
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Abstract
A process for preparing a 4-substituted pyridine product from a starting pyridine substituted in the 4-position by a leaving group susceptible to nucleophilic displacement when the starting pyridine is in quaternized form, comprises, quaternizing the starting pyridine under effective acidic conditions with acrylamide, N-monoalkylacrylamide or N-dialkylacrylamide, subjecting the resultant, corresponding quaternized starting pyridine, to a nucleophilic displacement reaction with a reagent which reacts with it to produce the corresponding quaternary salt of the 4-substituted pyridine product, and dequaternizing the latter under effective basic conditions to liberate the 4-substituted pyridine product.
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