1: β-D/L-uridine; acetonoxime levulinate With Pseudomonas cepacia lipase in tetrahydrofuran T=30°C; 13 h; Inert atmosphereEnzymatic reaction; 2: acetonoxime levulinate With Candida antarctica lipase B in tetrahydrofuran T=30°C; 17 h; Inert atmosphereEnzymatic reaction; 3: With ammonia in methanol; water T=20°C; 2 h; optical yield given as percent ee;

1: methyl 4-toluenesulfonate; 9-beta-D-arabinofuranosyladenine With potassium hydroxide in dimethyl sulfoxide T=20°C; 12 h; 2: acetonoxime levulinate in tetrahydrofuran T=30°C; 120 h; Inert atmosphereEnzymatic reaction; 3: With ammonium hydroxide in methanol T=20°C; 2 h; regioselective reaction;

dicyclohexyl-carbodiimide in diethyl ether T=20°C; 0.5 h;

1: methyl 4-toluenesulfonate; 9-beta-D-arabinofuranosyladenine With potassium hydroxide in dimethyl sulfoxide T=20°C; 12 h; 2: acetonoxime levulinate in tetrahydrofuran T=30°C; 120 h; Inert atmosphereEnzymatic reaction; 3: With ammonium hydroxide in methanol T=20°C; 2 h; regioselective reaction;

1: methyl 4-toluenesulfonate; 9-beta-D-arabinofuranosyladenine With potassium hydroxide in dimethyl sulfoxide T=20°C; 12 h; 2: acetonoxime levulinate in tetrahydrofuran T=30°C; 120 h; Inert atmosphereEnzymatic reaction; regioselective reaction;