A highly stereocontrolled 1,2-cis-α-glycosidation reaction under conditions mild enough for acid-labile alcohols has been developed using benzyl-protected glycopyranosyl diethyl phosphites as glycosyl donors in the presence of 2,6-di-tert-butylpyridinium iodide and tetrabutylammonium iodide.
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Tanaka et al. (1999) studied this question.
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