Synthesis of cyclopropyl glycosides and their use as novel glycosyl donors

Methods for the synthesis of cyclopropyl glycosides and their use as glycosyl donors are described. Cyclopropyl glycosides containing different substituents were prepared by cyclopropanation of the corresponding vinyl glycosides, or by glycosidation of cyclopropyl alcohols that are synthesized by the Kulinkovich reaction. 1-Methyl- and 1-phenyl-substituted cyclopropyl glycosides undergo coupling to Fmoc-protected serine and threonine and to partially protected monosaccharides in the presence of TMS triflate to give glycosidated products.