Preparation of 2-haloacyl-3-aminoacrylic acid derivatives

US6706911B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Norbert Lui · Odenthal, DE
• Thomas Brackemeyer · Recklinghausen, DE
• Peter Muller · Leverkusen, DE
• Marielouise Schneider · Leverkusen, DE

Key dates

• Filing date: Dec 13, 2002
• Grant date: Mar 16, 2004
• Expiry date: Dec 28, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to an improved process for preparing 2-haloacyl-3-aminoacrylic acid derivatives and pyrazole-4-carboxylic acids and derivates thereof obtainable from it.