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A series of chiral sulfahydantoins have been synthesized by alkaline cyclization starting from N-sulfamylaminoacid methyl esters. Regioselective glycosylation of these pseudopyrimidic heterocycles was carried out with a benzyl protecting group on the N-sulfonylcarbamic position. Best glycosylation results were obtained by preliminary silylation of sulfahydantoins, and their condensation with a tetraacylribofuranose...
Benzo and naphtho-dihydrofuran derivatives were obtained by the reaction of glycosyl fluorides with phenol and naphthol derivatives in the presence of Cp 2 MCl 2 /AgOTf (M = Hf, Zr). This process include a glycosylation, 1,2-migration and an intramolecular cyclization.
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