methyl sulfenyl bromide; 3 A molecular sieve; silver trifluoromethanesulfonate in 1,2-dichloro-ethane; acetonitrile T=-50°C; 18 h; Yield given. Yields of byproduct given;

methyl sulfenyl bromide; 7-deoxy-1,2;3,4-di-O-isopropylidene-α-D-glycero-D-galacto-heptopyranose; 3 A molecular sieve; silver trifluoromethanesulfonate in 1,2-dichloro-ethane; acetonitrile T=-50°C; 18 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

dimethyl-(methylthio)-sulphonium trifluoromethanesulphonate in acetonitrile T=-15°C; 1.5 h; molecular sieve;

in 1,2-dichloro-ethane 15 h; Inert atmospherePhotolysis;

sodium iodide in N,N-dimethyl-formamide T=110°C; 6 h;

Multi-step reaction with 2 steps 1: HCl, acetyl chloride / 0 - 20 °C2: 71 percent / ethanol / Ambient temperature; in dark