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Process for the preparation of 1-hydroxy-6-substituted pyridones
专利权人:
发明人:
Rahim Hani,David A. Steele,John Joseph Jardas
申请号:
US13763328
公开号:
US09884822B2
申请日:
2013.02.08
申请国别(地区):
US
年份:
2018
代理人:
摘要:
Disclosed herein is a cost effective and environmentally friendly process to prepare 1-hydroxy-6-substituted pyridones from 2,6-dichloropyridine. The process includes the steps of (a) reacting 2,6-dichloropyridine with hydrogen peroxide in the presence of trifluoroacetic acid at a first temperature to produce a first intermediate containing (1) trifluoroacetic acid and (2) 2,6-dichloropyridine N-oxide and/or salts thereof (b) adding sulfuric acid to the first intermediate to provide a second intermediate (c) removing trifluoroacetic acid from the second intermediate to provide a composition containing 2,6-dichloropyridine N-oxide and/or salts thereof which is essentially free of trifluoroacetic acid (d) reacting 2,6-dichloropyridine N-oxide and/or salts thereof from step (c) with RXH and a base wherein each R is independently a substituted or unsubstituted hydrocarbyl group having between 1 and 20 carbon atoms, X is oxygen or sulfur, to produce a corresponding 2,6-disubstituted-pyridine N-oxide and (e) heating the disubstituted compound thereby producing the 1-hydroxy-6-substituted pyridone.
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