Morpholine (0.02 ml, 0.23 mmol) and tetrakis(triphenylphosphine)palladium (0) (6 mg, 0.005 mmol) were successively added to a solution of tert-butyl 2-(allyloxy)-6-{[(4′-{1-[(allyloxy)carbonyl]-2-(dimethylamino)vinyl}-3′-fluoro-1,1′-biphenyl-4-yl)oxy]methyl}-3-(trifluoromethyl)benzoate (67 mg, 0.10 mmol) obtained in Example (93-1) in tetrahydrofuran (1 ml), and the mixture was stirred at room temperature for 1 hour. After the reaction mixture was poured into water and the mixture was extracted with ethyl acetate, the organic layer was successively washed with water and a saturated aqueous NaCl solution and dried with anhydrous sodium sulfate. The residue obtained by removing the solvent under reduced pressure was subjected to silica gel column chromatography (eluting solvent: n-hexane/ethyl acetate=10/1-1/>99) to give crude tert-butyl 2-hydroxy-6-{[(4′-{1-[(allyloxy)carbonyl]-2-(dimethylamino)vinyl}-3′-fluoro-1,1′-biphenyl-4-yl)oxy]methyl}-3-(trifluoromethyl)benzoate (42 mg).
