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A simple solution: When N,N-dimethylformamide was used to direct the stereochemical course of glycosylation reactions, 1,2-cis glycosylation products were formed with excellent selectivity. A straightforward highly α-stereoselective glycosylation involving preactivation (see scheme) should find broad application and be especially useful for sequential glycosylation reactions to form oligosaccharides. LG=leaving group.
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Lu et al. (2011) studied this question.
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