Methanol → Methyl 4-(4-(3-(4-chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenoxy)picolinate

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Reaction Steps

4-(4-(3-(4-chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenoxy)picolinic acid (1 g, 2.13 mmol) was suspended in methanol (20 mL). Concentrated sulfuric acid (5 mL) was added at room temperature. The resulted mixture was refluxed for 3 h. The solvent was removed under reduced pressure, and the residue was purified by column chromatography (dichloromethane: methanol=10:1) to give methyl 4-(4-(3-(4-chloro-3-(trifluoromethyl)phenyl)ureido)-3-fluorophenoxy)picolinate B8 (0.83 g, purity 97%, yield 80%) as a white solid.

Provenance & Evidence