Improved iterative olefination approach to oligosaccharide mimics: stereoselective synthesis of β-(1→6)-d-galactopentaose methylene isostere
摘要:
The title C-pentagalactoside featuring beta-(1-->6) ethylene bridges between the D-galactopyranose units has been prepared through four consecutive cycles comprising the Wittig reaction of a formyl C-galactoside building block with sugar phosphorane substrate followed by the introduction of a methylphosphonium group at the nonreducing end; the target product was obtained by hydrogenolysis of the tetraene pentasaccharide. (C) 2000 Elsevier Science Ltd. All rights reserved.