Diethyl Ether → 2-(3-(3-(Benzyloxy)phenyl)propyl)isoindoline-1,3-dione

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Instead of a Mitsunobu reaction, the ether was formed by alkylation as described. A suspension of phenol 58 (1 g, 3.5 mmol), benzyl bromide (0.3 mL, 3.5 mmol), cesium carbonate (1.158 g, 3.5 mmol) in NMP (3.5 mL) was heated at 70° C. for 24 h. The reaction mixture was quenched by the addition of water, extracted with DCM, washed with water, and dried over anhy. Na2SO4. Filtration and concentration under reduced pressure gave the crude product, which was purified by flash chromatography (hexane-ethyl acetate (0-30%) gradients) to give 2-(3-(3-(benzyloxy)phenyl)propyl)isoindoline-1,3-dione as a white solid. Yield (0.708 g, 55%): 1H NMR (400 MHz, DMSO-d6) δ 7.81-7.84 (m, 2H), 7.69-7.72 (m, 2H), 7.30-7.44 (m, 5H), 7.13-7.18 (m, 1H), 6.83-6.85 (m, 1H), 6.80 (d, J=7.6 Hz, 1H), 6.74 (dd, J=7.8, 2.0, 1H), 5.03 (s, 2H), 3.74 (t, J=7.2 Hz, 2H), 2.67 (t, J=7.6 Hz, 2H), 2.0-2.08 (m, 2H).

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