[C:1](=[O:14])([O:5][CH2:6][C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[O:2][CH2:3]Cl.[I-:15].[Na+]>C(#N)C>[C:1](=[O:14])([O:5][CH2:6][C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[O:2][CH2:3][I:15]Chloromethyl tert-butoxycarbonylmethyl carbonate (6.45 g) was added to a solution of sodium iodide (16.5 g) in acetonitril (65 ml). After stirring at 40° C. for 4 hours the reaction mixture was cooled in ice, filtered and evaporated in vacuo. The residue was taken up in dichloromethane, washed with aqueous sodium bicarbonate and sodium thiosulfate, dried over magnesium sulfate, filtered and evaporated in vacuo. Purification on silica gel with hexane/ethyl acetate (3:1) as eluent gave the title compound as a colourless oil.
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