Hetero-Diels-Alder Reactions on a Carbohydrate Template: Stereoselective Synthesis of ( S )-Anabash ... Waldemar Pfrengle and Horst Kunz* Znstitut fur Organische Chemie, Uniuersitdt Mainz, 0-6500 Mainz, Federal Republic of Germany Received February 21, 1989 Summary: Diastereoselective aza-Diels-Alder reaction using the tetra-0-pivaloyl-@-D-galactopyranosylamine ... Sir: 0-Acylglycosylamines, in particular the 2,3,4,6-tet- ra-0-pivaloyl-0-D- ...