反应详情

(2R,3R,4S,5R)-2-{2-(Aminomethyl)-6-[(2,2-diphenylethyl)amino]-9H-purin-9-yl}-5-(methoxymethyl)tetrahydro-3,4-furandiol (example 1) (110 mg, 0.22 mmol) was dissolved (using gentle heating) in dry tetrahydrofuran (20 ml) and the stirred solution treated with a solution of cyclohexanone (22 mg, 0.22 mmol) in dry tetrahydrofuran (2 ml) followed by addition of sodium triacetoxyborohydride (70 mg, 0.33 mmol) and a solution of acetic acid (0.14 ml, 0.25 mmol) in dry tetrahydrofuran (2 ml). The mixture was then stirred at room temperature for 24 hr. The reaction mixture was diluted with diethyl ether, washed with saturated aqueous sodium hydrogen carbonate, brine, dried with anhydrous magnesium sulfate and the solvent removed under reduced pressure. The residue was purified by column chromatography on silica gel eluting with a gradient system of dichloromethane:methanol:ammonia (95:5:0.5) changing to dichloromethane:methanol:ammonia (90:10:1) to afford the title compound as a solid (80 mg). MS: 573 (MH+).

1. washwashed with saturated aqueous sodium hydrogen carbonate, brine
2. dry with materialdried with anhydrous magnesium sulfate
3. customthe solvent removed under reduced pressure
4. customThe residue was purified by column chromatography on silica gel eluting with a gradient system of dichloromethane:methanol:ammonia (95:5:0.5)