反应详情

A solution of ((3aR,4R,6R,6aR)-6-(4-((2,4-dimethoxybenzyl)amino)-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methanol (1.52 g, 3.33 mmol) and triphenylphosphine (1.92 g, 7.32 mmol) in tetrahydrofuran (25 mL) was cooled at 0° C. and treated dropwise with diethyl azodicarboxylate (1.26 mL, 7.99 mmol). The now yellow solution was treated dropwise with a solution of N-methyl-2-nitrobenzenesulfonamide (1.01 g, 4.66 mmol) in tetrahydrofuran (9.9 mL, 120 mmol) over ˜5 minutes and the solution was allowed to stir and slowly warm up to room temperature. After 24 h at room temperature, HPLC indicated that the starting material had been consumed. The reaction mixture was partially concentrated and the solution was purified by flash chromatography (175 g silica gel, 60-90% EA/hept) to yield the title compound (0.82 g, 38%) as a light yellow glass: MS (ESI+) for C30H34N6O9S m/z 655.3 (M+H)+; (ESI−) for C30H34N6O9S m/z 653.3 (M−H)−; HPLC purity 68% (ret. time, 3.94 min).

1. customhad been consumed
2. concentrationThe reaction mixture was partially concentrated
3. customthe solution was purified by flash chromatography (175 g silica gel, 60-90% EA/hept)