Method for producing 3-amino-4,4,4-trifluorocrotonic acid esters

US7002038B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Thomas Güthner · Trostberg, DE
• Doris Krammer · Truchtlaching, DE

Key dates

• Filing date: Aug 13, 2003
• Grant date: Feb 21, 2006
• Expiry date: Aug 23, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C227/08
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process is described for preparing 3-amino-4,4,4-trifluorocrotonic esters of the formula (I) or the E/Z isomers or tautomeric forms thereof where R1 and R2 are each independently hydrogen, an optionally substituted linear C1–C4-alkyl radical or an optionally substituted benzyl radical and R3 is methyl or ethyl, which comprises With the aid of this two-stage process, the 3-amino-4,4,4-trifluorocrotonic esters can be prepared in high yields without significant by-products.