反应详情

温度

100 °C

To a suspension of adenine (1.22 g, 9.1 mmol) in 25 ml of anhydrous DMF was added 2.96 g of Ce2CO3 (hydrate) and the mixture was stirred at 100° C. for 15 min. A solution of 9 (2.9 g, ˜7.4 mmol) in 20 ml of DMF was added in one portion. The reaction was stirred at 100° C. for 4 hrs until no starting material was found by HPLC, then cooled and filtered to remove unreacted adenine and cesium salts. The filtrate was concentrated, re-dissolved in ethyl acetate, washed with water, saturated NaCl and dried under Na2SO4. The crude product obtained after solvent evaporation was chromatographed on silica eluting with a gradient of acetone (20-35%) in ethyl acetate. Concentration of the pure product fractions and drying in vacuo afforded 1.2 g (37%) of 10 as a pale yellow viscous syrup. 1H NMR (CDCl3): δ 8.32 (s, 1H), 7.70 (s, 1H), 7.24 (m, 5H), 5.64 (s, 2H), 4.38 (m, 1H), 4.34 (d, 8.1 Hz, 2H), 4.16 (m, 1H), 4.02 (m, 1H), 3.32 (m, 2H), 2.23 (m, 1H), 1.14 (d, J=6.3 Hz, 3H), 0.85 (s, 9H), 0.015 (s, 3H), 0.00 (s, 3H).

1. stirringThe reaction was stirred at 100° C. for 4 hrs until no starting material
2. temperaturecooled
3. filtrationfiltered
4. customto remove unreacted adenine and cesium salts
5. concentrationThe filtrate was concentrated
6. dissolutionre-dissolved in ethyl acetate
7. washwashed with water, saturated NaCl
8. customdried under Na2SO4
9. customThe crude product obtained
10. customafter solvent evaporation
11. customwas chromatographed on silica eluting with a gradient of acetone (20-35%) in ethyl acetate
12. customConcentration of the pure product fractions and drying in vacuo