Imidazole → HCID 24767999, compound

Participants

Reaction Steps

tert-Butyldimethylsilylchloride (12.5 g, 82.5 mmol) was gradually added under ice-cooling to a solution of 3′-ethynylcytidine (hereinafter referred to as ECyd) (20 g, 75 mmol) and imidazole (12.8 g, 188 mmol) in N,N-dimethylformamide (hereinafter referred to as DMF) (75 mL), and the mixture was stirred for 5 hours at room temperature. After completion of reaction, the solvent was evaporated under reduced pressure, and ethyl acetate was added to the residue. The mixture was washed with saturated aqueous sodium hydrogen carbonate (100 mL) and saturated brine (100 mL) and dried with magnesium sulfate. Magnesium sulfate was removed through filtration. The filtrate was stirred at room temperature, and precipitated crystals were collected through filtration, to thereby yield Compound 1 (11.5 g, 52%).

Provenance & Evidence