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A pragmatic approach for preparing glycoconjugates of complex oligosaccharides is to prepare the oligosaccharide as a building block with most of its protecting groups exchanged to protecting groups whose cleavage and other manipulations are highly compatible with the functional groups of complex aglycones. For such an approach the reducing end sugar of the building bloc must be protected with a cleavable...
The effective preparation of differentially protected l-iduronic acid derivatives, as building blocks for the synthesis of heparin-like oligosaccharides, is described in less than nine steps starting from readily available 1,2-O-isopropylidene-6,3-d-glucuronolactone. The pivaloyl group was used as a permanent protecting group of hydroxyl groups. Two heparin-like disaccharides with different sulfation...
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