New anthracycline disaccharides. Synthesis of L-daunosaminyl-α(1 →4)-2-deoxy-L-rhamnosyl and of L-daunosaminyl-α(1 →4)-2-deoxy-L-fucosyl daunorubicin analogues
Abstract
The synthesis of the new disaccharide anthracyclines 20, 21, 24 and 25, where the daunosamine moiety is separated from the aglycone by either a rhamnose or a fucose residue, performed following a convergent procedure, gives insight into the configurational requirement of the first sugar residue and opens the way to a new class of antitumour anthracyclines.