Stereoselective β-<i>C</i>- and β-<i>S</i>-Glycosylation of 2-Deoxyribofuranose Derivatives Controlled by the 3-Hydroxy Protective Group

Abstract

Abstract β-C-2-Deoxyribofuranosides and β-S-2-deoxyribofuranosides are prepared stereoselectively from 1-O-acetyl-5-O-benzyl-3-O-[2-(methylsulfinyl)ethyl]-2-deoxy-d-erythro-pentofuranose or the corresponding 3-O-(2-pyridyl-methyl)pentofuranose N-oxide by the reaction with silyl enol ethers or trimethlsilyl sulfides in the presence of a Lewis acid.