Cu-Al mixed oxide-catalysed multi-component synthesis of gluco- and allofuranose-linked 1,2,3-triazole derivatives.

A series of carbohydrate-linked 1,2,3-triazole derivatives were synthesized in good yields from glucofuranose and allofuranose diacetonides using as key step a three-component 1,3-dipolar azide-alkyne cycloaddition catalysed by a Cu-Al mixed oxide. In this multi-component reaction, Cu-Al mixed oxide/sodium ascorbate system serves as a highly reactive, recyclable and efficient heterogeneous catalyst for the regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles. The reported protocol has significant advantages over classical CuI/,-diisopropylethylamine (DIPEA) or CuSO/sodium ascorbate conditions in terms of efficiency and reduced synthetic complexity. In addition, the selective deprotection of synthesized di--isopropylidene derivatives was also carried out leading to the corresponding mono--isopropylidene products in moderate yields. Some of the synthesized triazole glycoconjugates were tested for their antimicrobial activity using the disc diffusion method against Gram-positive bacteria ( and ), Gram-negative bacteria ( and ), as well as fungus () and yeast (). The results revealed that these compounds exhibit moderate to good antimicrobial activity mainly against Gram-negative bacteria.