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DDO-6101 , a 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 has been efficiently synthesized by 'click chemistry' and evaluated for their in vitro antitumor activity and druglike properties. Most of the target compounds have sustained cytotoxicity against A549, HepG2, HCT116, and U2OS cancer cells and possess improved aqueous solubility, as well as permeability. Notably, these caged xanthones are also active towards taxol-resistant or cisplatin-resistant A549 cancer cells. Taking both the in vitro activities and druglike properties into consideration, compound 8g has been advanced into in vivo efficacy experiments. The results reveal that 8g (named as DDO-6318 ), both by intravenous or per os administration, are much more potent than the lead DDO-6101 in A549-transplanted mice models and it could be a promising antitumor candidate for further evaluation.

molecules/molecules online/molecules annual

‘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