4 A molecular sieve; tetra(n-butyl)ammonium hydrogensulfate in acetonitrile 1.) room temp., 3 h, 2.) reflux, 3 h;

1: potassium thioacyanate With 4 A molecular sieve; tetra(n-butyl)ammonium hydrogensulfate in acetonitrile T=20°C; 3 h; 2: 3,4,6-tri-O-acetyl-2-deoxy-2-N-trifluoroacetamido-α-D-glucopyranosylbromide in acetonitrile T=65°C; 1.5 h; Further stages.;

acetonitrile

3 A molecular sieve; bis(tri-n-butyltin)oxide in benzene T=20°C; 16 h;