potassium 9-O-(1,2:5,6-di-O-isopropylidene-α-D-glucofuranosyl)-9-boratabicyclolt;3.3.1gt;nonane in tetrahydrofuran T=-78°C; 8 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

Ca[N(SiMe3)2]2*2THF in toluene T=30°C; 1 h;

hydrogenchloride Reflux;

in tetrahydrofuran T=0°C; 10 h;