反应详情

A solution of adenosine (43 g) and 2,2-dimethoxypropane (5 eq.) in acetone (75 eq.) was treated with D-camphorsulphonic acid (1 eq) at and the resulting reaction was allowed to stir for 3 hr. The reaction mixture was concentrated in vacuo and diluted with a mixture of saturated aqueous NaHCO3 (250 mL) and ethyl acetate (250 mL). The resulting solution was transferred to a separatory funnel and the organic layer was separated, dried over sodium sulfate, and concentrated in vacuo to provide a solid residue. The solid residue was suspended in hexane, filtered, washed with hexane and dried to provide 2′,3′-Isopropylidene-adenosine (43 g). 1H NMR (DMSO-d6, 300 MHz): δ 4.12-4.17 (m, 1H), 4.22-4.26 (m, 1H), 4.59 (d, J=4.8 Hz, 1H), 4.74-4.85 (m, 2H), 5.49-5.52 (m, 1H), 5.51 (d, J=5.1 Hz, 1H), 5.84 (d, J=5.1 Hz, 1H), 7.85 (s, 2H), 8.33 (s, 1H). MS m/z 347.11 [M+H]+.

1. customthe resulting reaction
2. concentrationThe reaction mixture was concentrated in vacuo
3. additiondiluted with a mixture of saturated aqueous NaHCO3 (250 mL) and ethyl acetate (250 mL)
4. customThe resulting solution was transferred to a separatory funnel
5. customthe organic layer was separated
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated in vacuo
8. customto provide a solid residue
9. filtrationfiltered
10. washwashed with hexane
11. customdried