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Avoiding the intermediate: The β-selective glycosidation of 2-acetamido-2-deoxyglycosyl diethyl phosphites promoted by bis(trifluoromethanesulfonyl)imide (Tf2NH) proceeds in a direct manner and does not afford an oxazolinium ion as an intermediate (see scheme; MS (4Å)=4-Å molecular sieves).
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Arihara et al. (2005) studied this question.
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