1,8-Diazabicyclo(5.4.0)undec-7-ene → 2-Fluoro-5-(3-(oxazol-5-yl)pyridin-2-yloxy)benzoic acid

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Reaction Conditions

Reaction Steps

To 2-fluoro-5-(3-formylpyridin-2-yloxy)benzoic acid (230 mg, 0.881 mmol) and TosMIC (172 mg, 0.881 mmol) in DME (8.0 mL) was added DBU (0.29 mL, 1.9 mmol). The mixture was heated to 85° C. for 2.5 hours in a sealed tube. After concentrated, the residue was diluted with saturated sodium carbonate and extracted with EtOAc. The aqueous layer was acidified with TFA (pH˜3) and the resulting solid was filtered and dried to yield 2-fluoro-5-(3-(oxazol-5-yl)pyridin-2-yloxy)benzoic acid as a beige solid. MS m/z=301 [M+1]+. Calc'd for C15H9FN2O4: 300.25.

Provenance & Evidence