Abstract
The extract of the cell wall skeleton of Bacillus Calmette–Guérin (BCG-CWS) from Mycobacterium bovis is known to be an activator of innate immunity. Synthesis of pentaarabinofuranoside as part of the arabinan moiety of BCG-CWS was achieved by double α-arabinofuranosylation followed by double β-arabinofuranosylation with orthogonally protected donors. Mycolic esters of the arabinan in the terminal lipo-arabinan motif of BCG-CWS were synthesized through alkylation of unprotected mycolic acid with bis- and tetra-tosylates of pentaarabinofuranoside. A series of compounds were subjected to a tumor necrosis factor alpha (TNF-α) secretion-inducing assay, disclosing aspects of the structure–activity relationship which should be useful in finding the site of the activity.
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