2-Chlorophenol → Fluoxastrobin

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of (E)-(2-((6-chloro-5-fluoropyrimidin-4-yl)oxy)phenyl)(5,6-dihydro-1,4,2-dioxazin-3-yl)methanone O-methyl oxime (14)(100 g, 0.564 mol) in toluene was added 2-chlorophenol (54 g, 0.846 mol), K2CO3 (50 g, 0.733 mol), and DMF (50 mL) at ambient temperature. The reaction mixture was stirred at 50-60° C. for 3-4 h. The progress of the reaction was monitored by the HPLC analysis. Upon completion of the reaction, aqueous NaOH (10%) (200 mL) was charged followed by water (300 mL). The mixture was stirred and the toluene layer was separated. The toluene layer was washed with a solution of brine (600 mL). The final toluene layer was recovered completely to get the crude product. To the above crude product, methanol was charged and heated to 60° C. until the clear solution is formed. The solution was stirred at room temperature to get the pure product precipitated. The pure fluoxastrobin product was filtered and washed with methanol. The product was further dried to obtain the pure fluoxastrobin product meeting the desired specifications. Yield—75-88%.

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