Process for preparing pyrazoles

US10414733B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Birgit Gockel · Ludwigshafen, DE
• Daniel Saelinger · Ludwigshafen, DE
• Sebastian Soergel · Ludwigshafen, DE
• Michael Rack · Eppelheim, DE

Key dates

• Filing date: Jul 30, 2015
• Grant date: Sep 17, 2019
• Expiry date: Jul 30, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D405/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing a pyrazole compound of formula V, the process including cyclizing a hydrazone substituted α,β-unsaturated carbonyl compound of formula IV by reacting it with a suitable reagent, e.g. a reducing agent, an organometallic reagent or a nucleophilic reagent. The compounds of formula V are versatile reaction tools for the preparation of pyrazole derived fine chemicals. The present invention also relates to pyrazole compounds of formulae Va, Vb, Vc, and VI.