tin(ll) chloride in ethylene glycol dimethyl ether T=17°C; 24 h; further diaryldiazoalkanes; stereoselectivity;

ammonium hydroxide; water; sodium hydride; copper dichloride 1.) tetrahydrofuran; reflux, 24 h., 2.) cool, tetrahydrofuran; Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

1: methyl 3-O-β-D-galactofuranosyl-α-D-mannopyranoside With di(n-butyl)tin oxide in methanol 7 h; Heating; 2: methyl iodide With 4 A molecular sieve in N,N-dimethyl-formamide T=75°C; 24 h;

tin(ll) chloride in ethylene glycol dimethyl ether T=17°C; 48 h;

tin(ll) chloride in ethylene glycol dimethyl ether T=3°C; 1.5 h;