Synthesis of a derivative of a pentasaccharide repeating unit of the O-antigenic polysaccharide of the bacterium Klebsiella pneumoniae O3 as a benzoylated 2-methoxycarbonylethyl thioglycoside
A ruthenium(II)/phosphine catalytic system enabled efficient Domino meta-C−H ethyl glycosylations. Thus 1,2-trans-C-alkyl glycosides were obtained via the selective assembly of easily accessible glycosylbromide and alkenes under mild reaction conditions.