[C:1]([C:3]1[CH:10]=[CH:9][CH:8]=[CH:7][C:4]=1[CH2:5]O)#[CH:2].[C:11]1(=[O:21])[NH:15][C:14](=[O:16])[C:13]2=[CH:17][CH:18]=[CH:19][CH:20]=[C:12]12.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OC(C)C)=O)=NC(OC(C)C)=O>O1CCCC1.C1(C)C=CC=CC=1>[C:1]([C:3]1[CH:10]=[CH:9][CH:8]=[CH:7][C:4]=1[CH2:5][N:15]1[C:11](=[O:21])[C:12]2[C:13](=[CH:17][CH:18]=[CH:19][CH:20]=2)[C:14]1=[O:16])#[CH:2]To a solution of 2-ethynylbenzyl alcohol (1.00 g), phthalimide (2.20 g) and triphenylphosphine (3.96 g) in tetrahydrofuran (30 mL), a solution of diisopropyl azodicarboxylate (1.9 mol/L) in toluene (7.9 mL) was added under ice cooling, and the mixture was stirred at room temperature for 5 hours. The solvent was evaporated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (eluent, 96 to 66% hexane in ethyl acetate) to obtain 2-(2-ethynylbenzyl)isoindoline-1,3-dione (F8, 1.44 g) as pale orange solid.
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