First synthesis of methyl α-C-d-arabinofuranosyl-(1→5)-α-d-arabinofuranoside: the C-disaccharide segment of motif C of Mycobacterium tuberculosis

The synthesis of C-analogue of the disaccharide 2 α-araf-(1→5)-araf, present in motif C of the arabino-galactan portion of Mycobacterium tuberculosis, has been described. The critical CC bond formation reaction to couple both the furanosyl residues has been accomplished through nitro-aldol condensation.