[OH:1][N:2]1[C:6](=[O:7])[C:5]2=[CH:8][CH:9]=[CH:10][CH:11]=[C:4]2[C:3]1=[O:12].[Br:13][CH2:14][CH2:15][CH2:16]Br.C(N(C(C)C)CC)(C)C>CC#N>[Br:13][CH2:14][CH2:15][CH2:16][O:1][N:2]1[C:3](=[O:12])[C:4]2=[CH:11][CH:10]=[CH:9][CH:8]=[C:5]2[C:6]1=[O:7]To a solution of N-hydroxyphthalimide (2.0 g) and 1,3-dibromopropane (2.49 ml) in 50 ml of dry CH3CN was added diisopropylethylamine (4.27 ml). The mixture was stirred at room temperature. After 4 hours the volatiles were removed in vacuo. The residue was triturated with Et2O to provide 2.53 g of while solid, homogeneous by TLC.
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