1.1: NaH / dimethylformamide / 0.17 h / 0 °C 1.2: 82 percent / dimethylformamide / 20 °C 2.1: 88 percent / p-TsOH / CH2Cl2; methanol / 6 h / 20 °C View Scheme

1: (2R,3R,4S,5S,6R)-2-(benzyloxy)-6-((trityloxy)methyl)tetrahydro-2H-pyran-3,4,5-triol With sodium hydride in N,N-dimethyl-formamide T=0°C; 0.166667 h; 2: benzyl bromide in N,N-dimethyl-formamide T=20°C; Further stages.;