Process for the preparation of aminomethylene compounds

US5401869A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Helmut Kraus · Cologne, DE
• Nikolaus Muller · Monheim, DE
• Gerhard Marzolph · Cologne, DE
• Bernhard Beitzke · Bensberg, DE

Key dates

• Filing date: Jan 21, 1994
• Grant date: Mar 28, 1995
• Expiry date: Jan 21, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C253/30
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aminomethylene compounds of the formula ##STR1## may advantageously be prepared by reacting C--H-acidic compounds of the formula ##STR2## with formamide acetals of the formula ##STR3## in which the radicals R.sup.1 to R.sup.6 have the meaning given in the description, if the process is carried out in the presence of a secondary amine of the formula ##STR4## in which R.sup.7 and R.sup.8 have the meaning given in the description.