Phthalimide → 2-(Quinolin-6-ylmethyl)isoindoline-1,3-dione

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To a solution of isoindoline-1,3-dione (6.47 g, 44.0 mmol) and triphenylphosphine (11.53 g, 44.0 mmol) in THF (70 mL) at 0° C. was added a solution of quinolin-6-ylmethanol (7 g, 44.0 mmol) in THF (30 mL) and (E)-diisopropyl diazene-1,2-dicarboxylate (8.89 g, 44.0 mmol) dropwise over a period of 30 min. The mixture was heated at 30° C. and kept stirring for 20 h. After cooling and concentration, the resulting residue was purified by Analogix silica gel with gradient hexanes/EtOAc to provide 2-(quinolin-6-ylmethyl)isoindoline-1,3-dione (12.04 g, 95%). LCMS (method A): [MH]+=289, tR=4.89 min.

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