反应详情

To a stirred solution of [5-amino-3-[(2R,3R,5S)-5-[[tert-butyl(dimethyl)silyl]oxymethyl]-3-(trifluoromethylsulfonyloxy)tetrahydrofuran-2-yl]-2-oxo-thiazolo[4,5-d]pyrimidin-7-yl] trifluoromethanesulfonate (compound 38g, crude, 120 mg, 0.2 mmol) in DMF (2 mL) was added sodium cyanide (100 mg, 2.3 mmol). After being stirred at room temperature for 2 hours, the resulting solution was diluted by EtOAc, washed with brine, dried over Na2SO4 and concentrated in vacuo to afford 100 mg crude product of (2R,3S,5S)-2-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-5-[[tert-butyl(dimethyl)silyl]oxymethyl]tetrahydrofuran-3-carbonitrile (compound 38h), which was used in next step without further purification. MS obsd. (ESI+) [(M+H)+]: 424.

1. washwashed with brine
2. dry with materialdried over Na2SO4
3. concentrationconcentrated in vacuo