- Patent Title: Process for the preparation of 1-hydroxy-6-substituted pyridones
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Application No.: US13763328Application Date: 2013-02-08
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Publication No.: US09884822B2Publication Date: 2018-02-06
- Inventor: Rahim Hani , David A. Steele , John Joseph Jardas
- Applicant: Arch Chemicals, Inc.
- Applicant Address: US GA Atlanta
- Assignee: Arch Chemicals, Inc.
- Current Assignee: Arch Chemicals, Inc.
- Current Assignee Address: US GA Atlanta
- Agency: Dority & Manning, P.A.
- Main IPC: C07D211/72
- IPC: C07D211/72 ; C07D211/84 ; C07D213/69 ; C07D213/70 ; C07D213/61 ; A61K31/50 ; A61K31/495 ; C07D211/94 ; C07D213/89

Abstract:
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.
Public/Granted literature
- US20130211093A1 Process for the Preparation of 1-Hydroxy-6-Substituted Pyridones Public/Granted day:2013-08-15
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