The reaction of 1,2:5.6-di-O-isopropyliden-D-glucofuranose (I) with 3-chloro-N,N-dimethylaminopropane (II) by means of NaOH in refluxing dioxane gives 1,2:5,6-di-O-isopropylidene-3-O-[3'-(N,N-dimethylamino)propyl]-D-gluco-furanose (III), which is partially hydrolyzed with HCl in water.