Abstract
A variety of aureolic acids was efficiently obtained by lipase-catalyzed regioselective acylation reactions of mithramycin and its analogues mithramycin SK and mithramycin SDK. The acylation took place in the aglycone moiety or in the B sugar unit, depending on the substrate, lipase and acyl donor considered. Most of the novel acylated derivatives showed antitumor activity at double digit nanomolar concentrations, in some cases significantly improving the activity of the parent drugs.
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