To a mixture of (R)-1-(2-chloro-7-fluoroquinolin-3-yl)ethanol (3.03 g, 13.4 mmol), phthalimide (2.37 g, 1.20 eq) and PPh3 (4.23 g, 1.20 eq) in THF (70 mL) was added DIAD (3.13 mL, 1.20 eq) dropwise at 0° C. The mixture was then stirred at rt overnight before partitioning between EtOAc (200 mL) and water (200 mL). The organic layer was separated, washed with water, brine, dried over Na2SO4 and concentrated. The residue was purified by column chromatography on silica gel (DCM) to give a white foam of (S)-2-(1-(2-chloro-7-fluoroquinolin-3-yl)ethyl)isoindoline-1,3-dione (3.8 g, 80%). Mass Spectrum (ESI) m/e=355 (M+1).
