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US 11,390,587 B2Granted
Preparation of sulfonamide herbicide process intermediates
AssigneeCorteva Agriscience LLC
InventorsJossian Oppenheimer, Matthias S. Ober, Mark E. Ondari, Michael Gullo, Jayachandran Devaraj, Amaruka Hazari, Will Kruper
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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.
Claims27
A method comprising
- combining a compound of Formula IV, a first base, and a compound of Formula V or Formula VI, and mixtures thereof,
- to form the compound of Formula VII, the compound of Formula VIII, or a mixture thereof,
- wherein R is a C1-C6 alkyl, R1 is a C1-C6 alkyl, and X is Cl or OH.
A compound comprising:
- wherein R is a C1-C6 alkyl, R1 is a C1-C6 alkyl, and X is Cl or OH.
A compound comprising:
- wherein R is a C1-C6 alkyl and X is Cl or OH.
A compound comprising:
- wherein X is Cl or OH.
Dependencies are inferred from the claim text.