1: 5-bromo-2'-O,4'-C-methyleneuridine With ammonium sulfate; 1,1,1,3,3,3-hexamethyl-disilazane Heating; 2: trimethylaluminum With triphenylphosphine; palladium dichloride in tetrahydrofuran Heating; 3: With ammonium chloride in methanol; water Heating;

1: 1,1,1,3,3,3-hexamethyl-disilazane; 5-bromo-2'-O,4'-C-methyleneuridine With ammonium sulfate 24 h; Heating; 2: trimethylaluminum With triphenylphosphine; palladium dichloride in tetrahydrofuran; hexane 67 h; Heating; 3: With ammonium chloride in methanol 5 h; Heating;