Identification of a New Pentafluorosulfanyl-Substituted Chalcone with Activity Against Hepatoma and Human Parasites

Background/Objectives: New drugs are required for the treatment of liver cancers and protozoal parasite infections. Analogs of the known anticancer active and antileishmanial 2′,4′,6′-trimethoxychalcone SU086 were prepared and investigated. Methods: The chalcones were prepared according to the Claisen–Schmidt condensation protocol and analyzed. They were tested for activity against two liver cancer cell lines (HepG2 and HuH-7) and protozoal parasites ( Toxoplasma gondii and Leishmania major ). Unspecific toxicity and expression of Hsp90 and Hsp70 upon treatment were analyzed in liver cancer cells. Results: A new chalcone, 2′,4′,6′-trimethoxy-3-pentafluorosulfanylchalcone (246TMP-3SF5), with a pentafluorosulfanyl (SF 5 ) substituent showed pronounced activities against liver cancer cells and T. gondii parasites which were superior to the activities of the parent chalcone SU086 in these models. In contrast, SU086 and its anthracene analog 2′,4′,6′-trimethoxy-9-anthracenylchalcone (246TMP-Anth) were most active against L. major promastigotes. The new SF 5 -substituted chalcone behaved like the known Hsp90 inhibitor 17-AAG and upregulated Hsp70 expression in liver cancer cells. Conclusions: The SF 5 -substituted SU086 analog has potential to become a new drug for the therapy of hepatoma and toxoplasmosis.