Total synthesis of cyclo-l-rhamnohexaose by a stereoselective thermal glycosylation
摘要:
The first cyclooligosaccharide of L series, cyclo-L-rhamnohexaose, have been synthesized from L-rhamnose by alpha-selective thermal glycosylation and PhSeOTf promoted cycloglycosylation.
Cyclic heptamers of L-rhamnose, beta-cycloawaodorin and a stereoisomer, have been prepared by means of alpha-selective thermal glycosylation and DMTST induced cycloglycosylation. These novel oligosaccharides have characterized by nmr experiments as well as high resolution FAB mass spectra.