De Novo Synthesis of a Methylene-Bridged Neu5Ac-α-(2,3)-Gal <i>C</i>-Disaccharide
作者:Wolfgang Notz、Christian Hartel、Bernhard Waldscheck、Richard R. Schmidt
DOI:10.1021/jo015543l
日期:2001.6.1
treatment with phenylselenyl triflate, was stereoselectively cyclized in a 6-exo-trig selective manner. A selena-Pummerer rearrangement, oxidation, and esterification readily led to methyl ester 37 which, after deacetylation, could be regioselectively tetrabenzoylated with benzoyl cyanide. Triflate activation of the axial hydroxyl group in 40 and nucleophilicdisplacement by azide ion with inversion