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2,6-Dichlorobenzyltriphenylphosphonium bromide was coupled with phthalimide 29. Purification by flash chromatography (10 to 50% EtOAc-hexanes gradient) gave (E)-2-(3-(3-(2,6-dichlorostyryl)phenyl)propyl)isoindoline-1,3-dione as a white solid. Yield (0.7041 g, 96%): 1H NMR (400 MHz, DMSO-d6) δ 7.78-7.86 (m, 4H), 7.51 (d, J=8.4 Hz, 2H), 7.44 (s, 1H), 7.37 (d, J=7.6 Hz, 1H), 7.31 (d, J=8.4 Hz, 1H), 7.27 (t, J=7.2 Hz, 1H), 7.18 (d, J=7.6 Hz, 1H), 7.11 (d, J=16.4 Hz, 1H), 7.01 (d, J=16.8 Hz, 1H), 3.62 (t, J=6.8 Hz, 2H), 2.65 (t, J=7.4 Hz, 2H), 1.88-1.98 (m, 2H).

1. customPurification by flash chromatography (10 to 50% EtOAc-hexanes gradient)