1: 3-acetyl-1,2-dideoxy-4,6-O-isopropylidene-D-arabino-hex-1-enopyranose With methanol; sodium methylate T=20°C; 1 h; 2: tert-butyldimethylsilyl chloride With 1H-imidazole in N,N-dimethyl-formamide T=50°C; 3 h;

2,6-dimethylpyridine; 4-(N,N-dimethlyamino)pyridine in dichloromethane 0.25 h;