Thymidine → HCID 178521290, compound

Participants

Reaction Conditions

Reaction Steps

2-Amino-6-((2-hydroxyethyl)amino)-9H-purine (0.55 g, 2.6 mmoles) and 2',3'-dideoxy-3'-fluorouridine (0.50 g, 2.2 mmoles) were suspended in 50 ml 10 mM potassium phosphate buffer, pH 7.0, containing 0.04% potassium azide. Purine nucleoside phosphorylase (1120 I.U.) and thymidine phosphorylase (10,000 I.U.) (Krenitsky, et al., Biochemistry, 20, 3615, 1981 and U.S. Pat. No. 4,381,344) immobilized on DEAE cellulose was added and the suspension was stirred at 45° C. After 18 days, 150 ml MeOH was added to the reaction mixture. The resulting mixture was applied to a column containing AG1-X2 (OH-- form, 2.5×10 cm) and eluted with MeOH. Fractions containing product were pooled, concentrated, and flash chromatographed on silica gel 2.5×20 cm) with dichloromethane:methanol:acetone (96:2:2). Solvent was removed and lyophilization yielded 0.14 g of 2-amino-9-(2,3-dideoxy-3-fluoro-β-D-erythro-pentofuranosyl)-6-((2-hydroxyethyl)amino-9H-purine (19%): mp 144° C.; [α]D20 -29.4° C. (c=0.5, DMF); UV λmax (ε×10-3) at pH 7, 282 (12.0); at pH 13, 281 (13.213.9); 1H NMR (300 MHz, DMSO-d6) δ7.93 (s, 1H, H8), 7.14 (b, 1H, NH), 6.21 (dd, 1H, H1', J=9.4 Hz, J=5.6 Hz), 5.85 (bs, 2H, NH2), 5.30-5.35 (m, 2H, OH5' and H3'), 4.74 (b, 1H, OH), 4.18 (dt, 1H, H4', J=27.1 Hz, J=4.4 Hz), 3.42-3.62 (b, 6H, H, H5',H5", NCH2CH2O), 2.76-3.01 and 2.49-2.63 (m, 2H, H2' and H2"); MS (ci) 313 (M+1), 293 (M-F), 195 (MH2 --C5H8FO2).

Provenance & Evidence