Preparation of sulfonamide herbicide process intermediates

US11390587B2 · kind B2 · utility

Assignee

• CORTEVA AGRISCIENCE LLC · US

Inventors

• Jossian Oppenheimer · Midland, US
• Matthias S. Ober · Midland, US
• Mark E. Ondari · Freeland, US
• Michael Gullo · Midland, US
• Jayachandran Devaraj · Zionsville, US
• Amaruka Hazari · Carmel, US
• Will Kruper · Midland, US

Key dates

• Filing date: Dec 20, 2019
• Grant date: Jul 19, 2022
• Expiry date: Dec 20, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C323/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Improved methods for preparing chemical precursors to sulfonyl chloride III, which are important intermediates in the preparation of pyroxsulam herbicide are provided. Specifically, these precursors are compounds of Formulas VII and/or VIII, and IX, wherein R is a C1-C6 alkyl, R1 is a C1-C6 alkyl, X is Cl or OH, Y is halogen, OH, or OR2, and R2 is a C1-C6 alkyl.