Abstract
4-methoxy and 4-(2-trimethylsilylethoxy)pyrimidine bases were attached to the 5-position of the phenyl 2,3-dideoxy-1-seleno- glycero-pentofuranoside moiety. The presence of the silyl protecting group in the base is necessary to lead to neutral ß-anhydro nucleosides by intramolecular glycosylation. The subsequent ring opening affords 3′-deoxythymidine with complete stereocontrol.
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