1: 3-deoxy-3-fluoro-1,2:5,6-di-O-isopropylidene-α-D-gluco-pentofuranose With trifluoroacetic acid in water; acetic acid T=20°C; 2: acetic anhydride With pyridine Further stages.;

ethanol; Dowex 50W-X8lt;H(1+)gt;; water 4.5 h; Ambient temperature; Title compound not separated from byproducts;

1: 3-deoxy-3-fluoro-1,2:5,6-di-O-isopropylidene-α-D-gluco-pentofuranose With trifluoroacetic acid in water; acetic acid T=20°C; 2: acetic anhydride With pyridine Further stages.;