反应详情

4′-C-(Aminomethyl)thymidine (4) (0.025 g, 0.1 mmol), N-acetylglycine (0.023 g, 0.2 mmol) and TSTU (0.09 g, 0.3 mmol) were dissolved in anhydrous N,N-dimethylformamide (1 mL) at ambient temperature. Diisopropylethylamine (0.065 g, 0.5 mmol, 0.087 mL) was then added and the reaction mixture stirred for 18 hours at ambient temperature. The solvent was then removed under vacuum and the residue re-dissolved in 9:1 dichloromethane:methanol and eluted through a flash silica gel column with 9:1 dichloromethane:methanol. The title compound (19) was obtained as an amorphous solid on removal of solvent from the appropriate fractions (0.023 g). δH(300 MHz, CD3OD) 7.78(1H, s, H-6), 6.26(1H, dd, H-1′), 4.48(1H, dd, H-3′), 3.83(2H, s, glycyl CH2), 3.60(2H, 2d, H-5′), 3.58(1H, d, 4′-C—CH2), 3.42(1H, d, 4′-C—CH2), 2.33(2H, m, H-2′), 2.00(3H, s, CH3CO), 1.86(3H, s, 5-CH3); ES +ve m/z 393(M+Na)+.

1. customThe solvent was then removed under vacuum
2. dissolutionthe residue re-dissolved in 9:1 dichloromethane
3. washmethanol and eluted through a flash silica gel column with 9:1 dichloromethane