Thymidine → HCID 67569836, compound

Participants

Reaction Conditions

Reaction Steps

2-Amino-6-azetidinyl-9H-purine (0.50 g, 2.6 mmoles) and 2',3'-dideoxy-3'-fluorouridine (0.71 g, 3.1 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 to the reaction and the suspension was stirred at 45° C. After 7 days, 170 ml MeOH was added to the reaction. The reaction 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:acetone (7:3). Fractions containing product were pooled, concentrated, and flash chromatographed a second time on silica gel (2.5×20 cm) with dichloromethane:methanol (96:4). Solvent was removed and lyophilization yielded 0.566 g of 2-amino-6-azetidinyl-9-(2,3-dideoxy-3-fluoro-β-D-erythro-pentofuranosyl)-9H-purine (68%): mp 127°-129° C.; TLC Rf 0.70 (silica gel, MeCN:15N NH4OH:H2O/85:5:10);

Provenance & Evidence