Pyridine → HCID 22877781, compound

Participants

Reaction Steps

1.6 ml of trifluoroacetic acid were added dropwise to a solution of 1.861 g (2.655 mmol) of 3'-O-triisopropylsilyl-5'-O-(4,4'-dimethoxytrityl)thymidine [prepared as described in step (a) above] in 80 ml of chloroform, whilst cooling in an ice bath and stirring. The resulting mixture was stirred for 10 minutes and then 2 ml of pyridine were added. The reaction mixture was washed twice, each time with 100 ml of a 5% w/v aqueous solution of sodium hydrogencarbonate and dried over anhydrous sodium sulfate. The solvent was removed by distillation under reduced pressure, and the resulting residue was purified by column chromatography through 50 g of silica gel (70-230 mesh), using methylene chloride containing 4% by volume of methanol as the eluent, to give 0.9965 g (yield 94%) of the title compound.

Provenance & Evidence