Diflunisal → HCID 69619823, compound

Participants

Reaction Conditions

Reaction Steps

CDI (1.29 g, 7.99 mmol) was added to a solution of diflunisal (2.02 g, 8.07 mmol) in DMF (20 mL). The reaction mixture was stirred at 50° C. for 30 min and tert-butyl alcohol (1.50 mL, 14.97 mmol) and DBU (2.40 mL, 16.064 mmol) were dropwise added. The reaction mixture was stirred at 50° C. for 20 h and allowed to reach r.t. It was poured into NaHCO3 (100 mL, saturated aqueous solution) and extracted with EtOAc (100 mL). The organic layer was dried over Na2SO4 (anhydrous), filtered and concentrated. The crude residue was flash chromatographed on SiO2 (5% EtOAc/hexanes) to furnish 1.677 g of ten-butyl 2′,4′-difluoro-4-hydroxybiphenyl-3-carboxylate (colourless oil, yield: 68%).

Provenance & Evidence