Abstract
To facilitate the synthesis of paromomycin and/or neomycin analogues, we describe a cleavage of ring I from paromomycin that proceeds in the presence of azides and affords a glycosyl acceptor for the installation of a modified ring I. A paromomycin 4',6'-diol is oxidized by the Dess-Martin periodinane followed by m-chloroperoxybenzoic acid. Base treatment then affords a protected pseudodisaccharide, which functions as a glycosyl acceptor. The method should also apply to the cleavage of pyranosyl 4,6-diols from oligosaccharides and glycoconjugates.
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