Process for the preparation of heterocyclic compounds

US3981869A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventor

• Peter Ziemek · Cologne, DE

Key dates

• Filing date: Aug 5, 1974
• Grant date: Sep 21, 1976
• Expiry date: Aug 5, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B26/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Process for the preparation of heterocyclic compounds of the general formula ##SPC1## By condensation of an o-substituted amine of the general formula ##SPC2## With a carbonyl compound of the general formula ##EQU1## in the presence of a hydrazine of the general formula ##EQU2## followed by quaternization if appropriate. In the formulae the radicals have the meaning as indicated below.