[CH3:1][C:2]1([CH3:10])[O:7][C:6](=[O:8])[CH2:5][C:4](=[O:9])[O:3]1.ClCl.[N:13]([CH2:16][CH2:17][CH2:18][CH2:19][C:20](Cl)=[O:21])=[N+:14]=[N-:15]>CN(C)C1C=CN=CC=1.C(Cl)Cl>[N:13]([CH2:16][CH2:17][CH2:18][CH2:19][C:20]([CH:5]1[C:6](=[O:8])[O:7][C:2]([CH3:10])([CH3:1])[O:3][C:4]1=[O:9])=[O:21])=[N+:14]=[N-:15]To the solution of 2,2-dimethyl-1,3-dioxane-4,6-dione (4.45 g, 30.9 mmol) and 4-dimethylaminopyridine (7.55 g, 61.8 mmol) in 100 ml of CH2 Cl2 was added the solution of crude 5-azidovaleric chloride in 10 ml of CH2Cl2 at 0° C. The mixture was stirred at 0° C. for 1 hr and at room temperature for 1 hr. The solution was washed with 1N aqueous HCl (100 ml), brine (250 ml) and dried over Na2SO4. After evaporation of solvent, 5-(5-azidopentanoyl)-2,2-dimethyl-1,3-dioxane-4,6-dione was obtained as a light pink oil (8.17 g, 98%).
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