[Br:1][CH2:2][CH2:3][CH2:4][C:5](Cl)=[O:6].C([OH:11])C=C.N1C=C[CH:15]=[CH:14][CH:13]=1.Cl>ClCCl>[Br:1][CH2:2][CH2:3][CH2:4][C:5]([O:6][CH2:13][CH:14]=[CH2:15])=[O:11]4-Bromobutryl chloride (18.6 g) was treated with allyl alcohol (5.8 g) in the presence of pyridine (8 g) in dry dichloromethane at 0° C. for 0.5 hours. The solution was treated with aqueous HCl and warmed to room temperature. The organic layer was separated, washed with saturated aqueous brine, dried (MgSO4) and evaporated to give the title compound as a colourless oil, 19.7 g, 95% yield
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