1: 2',3'-O-isopropylideneuridine; N-chlorocarbonyl isocyanate in tetrahydrofuran T=-20 - 0°C; 2 h; Inert atmosphereMolecular sieve; 2: 1-aminotetraacetoglucose With triethylamine in tetrahydrofuran T=0 - 20°C; Inert atmosphere;

triethylamine in acetonitrile 24 h; Ambient temperature;

pyridine in dichloromethane; acetonitrile 20 h; Ambient temperature; Yield given. Further byproducts given. Yields of byproduct given;