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Aiming at developing inhibitors of mannosyltransferases, the enzymes that participate in the biosynthesis of the cell envelope of Mycobacterium tuberculosis, the synthesis of a range of designed triazole-linked 1,6-oligomannosides up to a hexadecamer has been accomplished by a modular approach centered on the Cu(I)-catalyzed azide-alkyne cycloaddition as key process. The efficiency and fidelity of the cycloaddition are substantiated by high yields (76-96%) and exclusive formation of the expected 1,4-disubstituted triazole ring in all oligomer assembling reactions. Key features of oligomers thus prepared are the anomeric carbon-carbon bond of all mannoside residues and the 6-deoxymannoside capping residue. Suitable bioassays with dimer, tetramer, hexamer, octamer, decamer, and hexadecamer showed variable inhibitor activity against mycobacterial α-(1,6)-mannosyltransferases, the highest activity (IC(50) = 0.14-0.22 mM) being registered with the hexamannoside and octamannoside.

journal of organic chemistry

Modular Approach to Triazole-Linked 1,6-α-<scp>d</scp>-Oligomannosides to the Discovery of Inhibitors of <i>Mycobacterium tuberculosis</i> Cell Wall Synthetase

Modular Approach to Triazole-Linked 1,6-α-d-Oligomannosides to the Discovery of Inhibitors of Mycobacterium tuberculosis Cell Wall Synthetase