Mucronulatol 1 and violanone 2 isolated fromDalbergia oliveri Gamble, and the corresponding isoflavone 3 were prepared by ligand coupling reactions involving organolead reagent. Biological studies have shown a significant cytotoxic effect against an HBL100 leukemia cell line only for isoflavan 1 with an IC50 value amounting to 5.7 μM. All the drugs modestly inhibit the in vitro microtubule assembly