Process for the preparation of 2-amino-s-triazines

US4587337A · kind A · utility

Assignee

• SKW Trostberg Aktiengesellschaft · DE

Inventors

• Stefan Weiss · Trostberg, DE
• Helmut Krommer · Trostberg, DE

Key dates

• Filing date: Mar 25, 1985
• Grant date: May 6, 1986
• Expiry date: Mar 25, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D251/18
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of 2-amino-s-triazines in three stages. In the first stage nitriles, alcohols and hydrogen chloride are reacted to form the corresponding imido-ester hydrochlorides. In the second stage, the imido-ester hydrochlorides are reacted with cyanamide in the aqueous phase to form the N-cyanimido-esters, which comprises carrying out the first stage in the presence of acetic acid esters and the second stage in an aqueous solution which has been brought to a pH value of 5-8 by addition of bases, and reacting the N-cyanimido-esters with O-alkylisourea, S-alkylisothiourea, guanidine or amidine salts in the presence of a base in the third stage. The 2-amino-s-triazines can be prepared in a high purity and with good yields in this manner.