反应详情

温度

7.5 °C

To a stirred solution of 1.6 g (3.7 mmol) of [(1R,2R,4R,5R)-4-(6-amino-2-iodopurin-9-yl)-7,7-dimethyl-3,6,8-trioxabicyclo[3.3.0]oct-2-yl]methan-1-ol (6.6) in 200 mL of H2O was added 0.60 g of KOH and, dropwise, a solution of 1.70 g (10.8 mml) of KMnO4 in 50 mL of H2O. The mixture was set aside in the dark at room temperature for 225 hours. The reaction mixture was then cooled to 5-10° C. and decolorized by a solution of 4 mL of 30% H2O2 in 16 mL of water, while the temperature was maintained under 10° C. using an ice-salt bath. The mixture was filtered through Celite and the filtrate was concentrated under reduced pressure to about 10 mL and then acidified to pH 4 with 2N HCl. The resulting precipitate was filtered off and washed with ether to yield 6.7 (70%) after drying as a white solid, m.p. 187-190° C. 1H NMR (300 MHz, DMSO-d6) δ 8.11 (s, 1H, H-8), 7.62 (s, 2H, NH2), 7.46 (s, 1H, COOH), 6.22 (s, 1H, H-1′), 5.42 (d, J=5.71 Hz, 1H, H-2′), 5.34 (d, J=6.16 Hz, 1H, H-3′), 4.63 (s, 1H, H-4′), 1.46 and 1.30 (s, 3H, C(CH3)2).

1. customdark at room temperature
2. customfor 225 hours
3. temperaturewas maintained under 10° C.
4. filtrationThe mixture was filtered through Celite
5. concentrationthe filtrate was concentrated under reduced pressure to about 10 mL
6. filtrationThe resulting precipitate was filtered off
7. washwashed with ether