Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 71, Issue 20, Pages 7546-7557Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo0607156
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A route has been paved toward the preparation of triazole glycocluster libraries via the copper(I)-catalyzed modern version of the classical Huisgen 1,3-dipolar cycloaddition of azides to alkynes. Up to four 1,4-disubstituted 1,2,3-triazole rings bearing carbon-linked glycosyl fragments were constructed on various scaffolds via multiple cycloadditions of suitably polyfunctionalized calix[4] arene, adamantane, and benzene derivatives with ethynyl and azidomethyl C-glycosides. Each cycloaddition occurred with high regioselectivity to give exclusively the 1,4-disubstituted triazole ring in very high yield up to an average value of 98%. The high degree of efficiency of this approach and its wide scope constitute a simple and practical means for the attachment of various sugar units to polyfunctionalized substrates.
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