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2 results for “Cu-Al Mixed oxide”
Data from: Cu-Al mixed oxide-catalysed multicomponent synthesis of gluco- and allofuranose-linked 1,2,3-triazole derivatives
<p><span>A series of carbohydrate linked-1,2,3-triazole derivatives were synthetized in good yields from glucofuranose and allofuranose diacetonides using as key step a three-component 1,3-dipolar azide-alkyne cycloaddition catalyzed by a Cu-Al mixed oxide. In this multicomponent reaction, Cu-Al mixed oxide/sodium ascorbate system serves as highly reactive, recyclable and efficient heterogeneous catalyst for regioselective synthesis of 1,4-disubstituted 1,2,3-triazoles. The reported protocol has significant advantages over classical CuI/DIPEA or CuSO<sub>4</sub>/sodium ascorbate conditions in terms of efficiency and reduced synthetic complexity. In addition, the selective deprotection of synthesized di-<i>O</i>-isopropylidene derivatives was also carried out leading to the corresponding mono-<i>O</i>-isopropylidene products in moderate yields. Some of the synthesized triazole glycoconjugates were tested for their <em>in vitro</em> antimicrobial activity using the disk diffusion method against Gram-positive bacteria (<i>Staphylococcus aureus</i> and <i>Bacillus subtilis</i>), Gram-negative bacteria (<i>Escherichia coli</i> and <i>Pseudomonas aeruginosa</i>), as well as fungus (<i>Aspergillus niger</i>) and yeast (<i>Candida utilis</i>). The results revealed that these compounds exhibit moderate to good antimicrobial activity mainly against Gram-negative bacteria. </span></p>
Data from: Cu-Al mixed oxide-catalysed multicomponent synthesis of gluco- and allofuranose-linked 1,2,3-triazole derivatives
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