摘要:
beta-C-Glycosides with the D-manno, D-allo, and D-altro configurations can be easily obtained by anchimerically assisted inversions, starting from a common beta-C-glycoside precursor, nitro(4,6-O-benzylidene-beta-D-glucopyranosyl)methane (2), which is easily accessible from D-glucose. The observed neighboring group reactions show some similarities to reactions Previously observed for analogous O-glycosides, but also some significant differences due to the acetamidomethyl beta-C-glycoside group, which is present in most of the compounds. The configurations and conformations of all compounds have been comprehensively studied by NMR methods. The result is a viable and extendable synthetic paradigm for the rational synthesis of a wide variety of unusual C-glycoside derivatives, potentially useful for biochemical studies.