反应详情

To a solution of [(2R,3R,5S)-5-(1-acetoxypropyl)-2-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)tetrahydrofuran-3-yl]acetate (compound 1g, 7.0 g, 16.9 mmol) in methanol (200 mL) was added K2CO3 (1.18 g, 8.5 mmol). After being stirred at room temperature for 12 hours, the reaction mixture was adjusted to pH 6.0 by addition of HOAc (1.2 g, 17 mmol), concentrated in vacuo and the residue was purified by column chromatography on silica gel (eluting with 1:2 EtOAc in petroleum ether) to afford 2.8 g of 1-[(2S,4R,5R)-5-(5-amino-2,7-dioxo-6H-thiazolo[4,5-d]pyrimidin-3-yl)-4-hydroxy-tetrahydrofuran-2-yl]propyl acetate (compound 22a) as a yellow solid. MS obsd. (ESI−) [(M−H)+]: 369.

1. concentrationconcentrated in vacuo
2. customthe residue was purified by column chromatography on silica gel (eluting with 1:2 EtOAc in petroleum ether)