反应详情

温度

25 °C

A mixture of 10 (0.26 g, 0.63 mmol), cytosine (0.105 g, 0.95 mmol), and potassium nonafluorobutanesulfonate (0.77 g, 2.3 mmol) was suspended in 12 mL dry acetonitrile under nitrogen. HMDS (0.135 mL, 0.63 mmol) and TMS-Cl (0.37 mL, 2.9 mmol) were added sequentially via syringe and the reaction stirred at 25° C. overnight. The reaction was poured into a mixture of 20 mL dichloromethane and 15 mL saturated NaHCO3 and shaken. The organic phase was dried (MgSO4) and concentrated in vacuo. The anomeric mixture was separated by preparative TLC with 7.5% MeOH/CHCl3 with an ammonia atmosphere: yield of β-anomer, 78 mg and 117 mg of the α-anomer to afford total yield of 195 mg (66.5%); FAB MS 466 (M+H)+ ; 1H NMR (CDCl3) of α/β anomer, δ 8.12 (d, 1, 6-H), 7.7 (m, 4, ArH), 7.4 (m, 6, ArH), 6.32 (m, 1, 1'-H), 5.9-5.3 (hump, 1, NH2), 5.75 (d, 1, 5-H), 5.45 (d, 1, 5-H), 3.75 (m, 3, 4'-Hα,β 's, 3'-Hα,β 's).

1. stirringshaken
2. dry with materialThe organic phase was dried (MgSO4)
3. concentrationconcentrated in vacuo
4. customThe anomeric mixture was separated by preparative TLC with 7.5% MeOH/CHCl3 with an ammonia atmosphere
5. customyield of β-anomer, 78 mg and 117 mg of the α-anomer to afford total yield of 195 mg (66.5%)