Abstract Reaction of (R)-1-Op-toluenesulfonyl-1, 2, 3-propanetriol (IV) with N- trimethylacetylimidazole (II) afforded (R)-1-Op-toluenesulfonyl-3-O-trimethyacetyl-1, 2, 3- propanetriol (V) which was reacted with dimethoxymethane in the presence of phosphorus pentoxide to give (R)-2-O-methoxymethyl-1-Op-toluenesulfonyl-3-O-trimethyacetyl-1, 2, 3- propanetriol (VI). Compound VI was treated with acetic anhydride and boron trifluoride ...