5-(1,2,3,4-tetra-O-acetyl-alpha-D-xylopyranos-5S-C-yl)-1,3,4-oxathiazol-2-one (8) has been prepared from glucuronamide in two steps and 73% overall yield by conversion to the tetra-O-acetyl derivative 7 followed by reaction with chlorocarbonylsulfenyl chloride.