反应详情

Sodium triacetoxyborohydride (75 mg, 0.35 mmol) and acetic acid (16 mg, 0.27 mmol) were added sequentially to a stirred solution of (2R,3R,4S,5R)-2-{2-(2-aminoethyl)-6-[(2,2-diphenylethyl)amino]-9H-purin-9-yl}-5-(methoxymethyl)tetrahydro-3,4-furandiol (example 11) (120 mg, 0.24 mmol) and cyclohexanone (23 mg, 0.235 mmol) in dichloromethane (15 ml). The resulting mixture was stirred at room temperature for 24 hr, diluted with dichloromethane and washed sequentially with a saturated aqueous solution of sodium hydrogen carbonate, water and brine. The organic phase was dried with anhydrous sodium sulfate, the solvent removed under reduced pressure and the residue 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 (78 mg). MS: 587 (MH+).

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