[CH2:1]([O:4][C:5]1[CH:10]=[CH:9][C:8]([N:11]2[C:15](=[O:16])[CH2:14][CH:13](Cl)[C:12]2=[O:18])=[CH:7][CH:6]=1)[CH:2]=[CH2:3].C(N(CC)CC)C>ClCCl>[CH2:1]([O:4][C:5]1[CH:6]=[CH:7][C:8]([N:11]2[C:15](=[O:16])[CH:14]=[CH:13][C:12]2=[O:18])=[CH:9][CH:10]=1)[CH:2]=[CH2:3]N-(4-Allyloxyphenyl)chlorosuccinimide (265.5 g, 1 mole) was dissolved in dichloromethane (1300 ml) and cooled to 10° C. Triethylamine (101 g, 1 mole) was added in 10 min and the reaction was stirred for 10 min. The reaction mixture was washed with 1M hydrochloric acid and dried over sodium sulfate. The organic solvent was removed under reduced pressure and the solid was recrystallized from methanol.
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