Novel process for the preparation of 2-halo-3-nitro-6-alkoxy-pyridines
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United States of America Patent
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Jul 16, 1985
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N/A
app pub date -
Jul 11, 1983
filing date -
Aug 19, 1982
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Expired
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Abstract
A novel simple process for the preparation of 2-halo-3-nitro-6-alkoxy-pyridines having 1 to 6 alkoxy carbon atoms of high purity comprising adding 2-halo-6-alkoxy-pyridine in portions at 0.degree. to 40.degree. C. to a mixture of concentrated sulfuric acid and concentrated nitric acid to obtain impure 2-halo-3-nitro-6-alkoxy-pyridine, treating the latter with a solution of an alkaline reacting compound in a protic solvent and recovering the said pyridine in substantially pure form which are important intermediates for analgesics.
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