Caged Garcinia Xanthones, a Novel Chemical Scaffold with Potent Antimalarial Activity
作者:Hangjun Ke、Joanne M. Morrisey、Shiwei Qu、Oraphin Chantarasriwong、Michael W. Mather、Emmanuel A. Theodorakis、Akhil B. Vaidya
DOI:10.1128/aac.01220-16
日期:2017.1
falciparum, the causative parasite of human malaria, at the intraerythrocytic stages. Their activity can be substantially improved by attaching a triphenylphosphonium group at the A ring of the caged xanthone. Specifically, CR135 and CR142 were found to be highly effective antimalarial inhibitors, with 50% effective concentrations as low as ∼10 nM. CGXs affect malariaparasites at multiple intraerythrocytic
Chiral resolution of a caged xanthone and evaluation across a broad spectrum of breast cancer subtypes
作者:Oraphin Chantarasriwong、Tanis J. Dorwart、Theodore Habarth Morales、Stephanie F. Maggio、Aspen L. Settle、Andrew T. Milcarek、Mary L. Alpaugh、Maria A. Theodoraki、Emmanuel A. Theodorakis
DOI:10.1016/j.bioorg.2019.103303
日期:2019.12
Racemic resolution of (+/-)-MAD28, a representative caged xanthone, was accomplished using (1S, 4R)-(-)-camphanic chloride as the chiral agent. Selective crystallization of the resulting diastereomers in acetonitrile produced, after hydrolysis, the pure enantiomers. Screening of racemic MAD28 and both enantiomers across a broad spectrum of breast cancer cell lines revealed that they: (a) are equipotent in each of the breast cancer subtypes examined; and (b) exhibit a higher degree of cytotoxicity against breast cancer cell lines of basal-like subtype and triple negative receptor status. The results support the notion that MAD28 and related caged xanthones are promising drug leads against chemoresistant and metastatic cancers.
‘Click Chemistry’ Synthesis of Novel Natural Product-Like Caged Xanthones Bearing a 1,2,3-Triazole Moiety with Improved Druglike Properties as Orally Active Antitumor Agents
natural-product-like caged xanthone discovered previously in our laboratory based on the pharmacophoric scaffold of the Garcinia natural product gambogic acid (GA), shows potent cytotoxicity in vitro, but poor efficacy in vivo due to its poor druglike properties. In order to improve the druglike properties and in vivo antitumor potency, a novel series of ten triazole-bearing caged xanthone derivatives of DDO-6101