Rhamnosylation Reaction with a Phenyl 1-Thiorhamnoside and a Rhamnosyl Fluoride Which Have 4C1 Conformation

Abstract

Abstract Rhamnosylation reaction with a phenyl 1-thiorhamnoside and a rhamnosyl fluoride that has chair conformation with more axial substituents (4C1) is described. Flipping of the ring conformation changed the high α-selectivity of the general rhamnosylation reaction. More β-rhamnosides were afforded under several conditions.