Carbon tetrabromide → 5'-Azido-2',5'-dideoxy-5-n-propyluridine

Beteiligte Stoffe

Reaktionsschritte

0.57 g of 2'-deoxy-5-n-propyluridine, 0.6 g of triphenylphosphine and 0.69 g of sodium azide were stirred in 20 ml of dry dimethylformamide. 0.77 g of carbon tetrabromide was added over a period of 5 minutes. The mixture was stirred at room temperature for 72 hours, 20 ml of methanol were added and the mixture was stirred for a further 0.5 hour. The mixture was evaporated and the residue was stirred with a mixture of 25 ml of dichloromethane/ methanol (8:2). An insoluble solid was removed by filtration and the filtrate was chromatographed on 200 g of silica gel in the same solvent mixture to give 0.41 g of 5'-azido-2',5'-dideoxy-5-n-propyluridine of melting point 177°-179° C. (decomposition).

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