Trimethylsilyl triflate → 5-Aza-2'-deoxycytidine

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Reaction Steps

34 mL of BSTFA are added to a suspension of 6.4 g of azacytosine in 300 mL of acetonitrile. The mixture is brought to 50° C. and it is stirred for 90 minutes. It is cooled to ambient temperature, 6.3 mL of trimethylsilyltriflate and 11.1 g of 1-chloro-3,5-di-p-toluoyl-2-deoxy-D-ribofuranose are added to the solution, in about ten minutes. It is stirred for 140 minutes, 400 mL of methanol are added controlling the temperature in an ice bath. Concentration is carried out at low pressure until a viscous residue is obtained, 400 mL of methanol are added, it is heated to 50° C. and 36 mL of 30% solution of sodium methylate in methanol are added. It is stirred for 1 hour, it is cooled to 0° C., it is stirred to complete precipitation and the solid is filtered by washing it on the filter with methanol. 2.3 g of decitabine with HPLC purity (UV 254 nm) of 99.2% are obtained after drying at low pressure.

Provenance & Evidence