Spirocyclic C-arylribosides were synthesized from the known-ribonolactone derivative. Lithium acetylide addition followed by glycosylation with 3-(trimethylsilyl) propargyl alcohol converted the ribonolactone to silylated diynes. After desilylation or iodination, subsequent rutheniumcatalyzed cycloaddition of resultant diynes with alkynes or chloroacetonitrile gave spirocyclic C-arylribosides.
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