Synthesis of Enantiopure Carbohydrate Mimetics by Lewis Acid Catalyzed Rearrangement of 1,3-Dioxolanyl-Substituted 1,2-OxazinesThis work was generously supported by the Deutsche Forschungsgemeinschaft, the Deutscher Akademischer Austauschdienst (fellowship for A.A.H.), the Fonds der Chemischen Industrie, and Schering AG. We thank B. Bressel and Dr. R. Zimmer for help during the preparation of this manuscript, W. Münch for HPLC separations, as well as M. Wiecko and J. Gebers for experimental assistance.