Pyridine → HCID 178430607, compound

Participants

Reaction Steps

79.7 mg (0.2 mmol) of 5'-[(2-naphthyl)methylthio]-5'-deoxythymidine [prepared as described in step (a) above] were dried by azeotropic distillation with pyridine and then dissolved in 2.5 ml of tetrahydrofuran. 0.084 ml (0.48 mmol) of diisopropylamine was then added to the solution. 54 μl (0.24 mmol) of 2-cyanoethyl N,N-diisopropylchlorophosphoramidite were then added dropwise to the mixture, under an atmosphere of argon. The resulting mixture was stirred at room temperature for 1.75 hours under the same atmosphere. The tetrahydrofuran was then removed by distillation under reduced pressure. The resulting residue was dissolved in 10 ml of ethyl acetate, and the solution was washed with a 10% w/v aqueous solution of sodium carbonate and with a saturated aqueous solution of sodium chloride, in that order. The solution was then dried over anhydrous magnesium sulfate, after which the solvent was distilled off under reduced pressure, and the residue was purified by column chromatography through 10 g of silica gel (70-230 mesh), using ethyl acetate as the eluent, to give 67 mg (yield 56%) of the title compound as a foam-like substance.

Provenance & Evidence