Process for the preparation of 1-hydroxy-pyridones

US3972888A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gerhard Lohaus · Kelkheim, DE
• Walter Dittmar · Hofheim, DE

Key dates

• Filing date: Aug 23, 1974
• Grant date: Aug 3, 1976
• Expiry date: Aug 23, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D213/50
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Method for making 6-substituted-1-hydroxy-2-pyridones, which may also be substituted in one or more of the 3-, 4-, and 5-positions, by reaction of the corresponding 2-pyrone with hydroxylamine or its salts in the presence of imidazole or a 2-aminopyridine which may be mono- or di-methyl substituted.