[Source: ACS Medicinal Chemistry Letters, full page: (LINK). Abstract, edited.]
Synthesis of Thymoquinone–Artemisinin Hybrids: New Potent Antileukemia, Antiviral, and Antimalarial Agents
Tony Fröhlich†, Christoph Reiter†, Mohamed E. M. Saeed‡, Corina Hutterer§, Friedrich Hahn§, Maria Leidenberger∥, Oliver Friedrich∥, Barbara Kappes∥, Manfred Marschall§, Thomas Efferth‡, and Svetlana B. Tsogoeva*†
† Organic Chemistry Chair I and Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander University of Erlangen-Nürnberg, Nikolaus-Fiebiger-Straße 10, 91058 Erlangen, Germany; ‡ Department of Pharmaceutical Biology, Institute of Pharmacy and Biochemistry, University of Mainz, Staudinger Weg 5, 55128 Mainz, Germany; § Institute for Clinical and Molecular Virology, Friedrich-Alexander University of Erlangen-Nürnberg, Schlossgarten 4, 91054 Erlangen, Germany; ∥ Institute of Medical Biotechnology, Friedrich-Alexander University of Erlangen-Nürnberg, Paul-Gordon-Straße 3, 91052 Erlangen, Germany
ACS Med. Chem. Lett., Article ASAP / DOI: 10.1021/acsmedchemlett.7b00412
Publication Date (Web): December 21, 2017
Copyright © 2017 American Chemical Society
*Tel: (+) 49 9131 85 65573. E-mail: firstname.lastname@example.org.
A series of hybrid compounds based on the natural products artemisinin and thymoquinone was synthesized and investigated for their biological activity against the malaria parasite Plasmodium falciparum 3D7 strain, human cytomegalovirus (HCMV), and two leukemia cell lines (drug-sensitive CCRF-CEM and multidrug-resistant subline CEM/ADR5000). An unprecedented one-pot method of selective formation of C-10α-acetate 14 starting from a 1:1 mixture of C-10α- to C-10β-dihydroartemisinin was developed. The key step of this facile method is a mild decarboxylative activation of malonic acid mediated by DCC/DMAP. Ether-linked thymoquinone–artemisinin hybrids 6a/b stood out as the most active compounds in all categories, while showing no toxic side effects toward healthy human foreskin fibroblasts and thus being selective. They exhibited EC50values of 0.2 μM against the doxorubicin-sensitive as well as the multidrug-resistant leukemia cells and therefore can be regarded as superior to doxorubicin. Moreover, they showed to be five times more active than the standard drug ganciclovir and nearly eight times more active than artesunic acid against HCMV. In addition, hybrids 6a/b possessed excellent antimalarial activity (EC50 = 5.9/3.7 nM), which was better than that of artesunic acid (EC50 = 8.2 nM) and chloroquine (EC50 = 9.8 nM). Overall, most of the presented thymoquinone–artemisinin-based hybrids exhibit an excellent and broad variety of biological activities (anticancer, antimalarial, and antiviral) combined with a low toxicity/high selectivity profile.
Keywords: anticancer activity; antimalarial activity; antiviral activity; Artemisinin; natural product hybrid; thymoquinone
Keywords: Antivirals; Thymoquinone; Artemisin; Cancer; CMV; Malaria.