Benzyl chloroformate → (+/-)-1-(5-Fluoro-2-hydroxy-phenyl)-1,3-dihydro-isoindole-2-carboxylic acid benzyl ester

To an-ice cooled solution of (±)-2-(2,3-dihydro-1H-isoindol-1-yl)-4-fluoro-phenol (13 mg, 0.055 mmol, 1.00 eq.) and DIPEA (37 μL, 0.218 mmol, 4.00 eq.) in DCM (2 mL), benzyl chloroformate (8 μL, 0.057 mmol, 1.05 eq.) was added dropwise. Upon completion of the addition, the cooling bath was removed and the solution was stirred at r.t. for 3 hours. The reaction was quenched with 1M aq. citric acid soln. (5 mL). The layers were separated. The aq. phase was extracted with DCM (3×2 mL). The comb. org. phases were dried over MgSO4 and concentrated in vacuo. The residue was purified by prep. HPLC (column: Atlantis, 30×75 mm, 10 um, UV/MS, acidic conditions) and concentrated in vacuo to give (±)-1-(5-fluoro-2-hydroxy-phenyl)-1,3-dihydro-isoindole-2-carboxylic acid benzyl ester.