Abstract
β-anomers of 4′-thionucleosides have been synthesized stereoselectively, through PhSeCl- or N-iodosuccimide (NIS)-initiated electrophilic glycosidation to 3,5-O-(di-t-butylsilylene)-4-thiofuranoid glycal (1). This synthetic method has been applied to the synthesis of those analogues branched at the anomeric position using 1-C-carbon-substituted 3,5-O-(tetraisopropyldisiloxane-1,3-diyl)-4-thiofuranoid glycals (11–14) prepared based on lithiation of 10.
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