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US 2022/0177406 A1Published application
Novel process for preparation of key intermediate of pinoxaden
AssigneeBhagiradha Chemicals & Industries Limited
InventorsS. CHANDRASEKHAR, B. PUNITH, B. SIVARAMI REDDY
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Abstract
A novel process for preparation of compounds of formula (I) used in the synthesis of Pinoxaden. The intermediate is a substituted phenyl malonic esters of formula (I), where R is C1-C4 alkyl, straight or branched chain.
Claims9
A process for preparation of compound of formula-I, through novel route comprising the steps of:
- A. Reacting Grignard salts of formula Il with oxomalanoic acid esters of formula Ill, where R is C1-C4 alkyl, straight or branched chain, to form compound of formula IV.
- B. Halogenation of compound of formula IV in a solvent along with halogenating agent to obtain compound of formula V
- C. Hydrodehalogenation of compound of formula V to obtain compound of formula I.
- wherein Formula-1, R is C1-C4 alkyl, straight or branched chain.
1 more element
Dependencies are inferred from the claim text.