Looking for new antiplasmodial quinazolines: DMAP-catalyzed synthesis of 4-benzyloxy- and 4-aryloxy-2-trichloromethylquinazolines and their in vitro evaluation toward Plasmodium falciparum

European Journal of Medicinal Chemistry
2016.0

Abstract

A DMAP catalyzed synthesis of new 4-benzyloxy- and 4-aryloxy-2-trichloromethylquinazolines was studied, in a view to react 4-chloroquinazolines with poorly nucleophilic alcohols such as benzylic alcohols, via a simple and cheap SNAr reaction approach. A fast (1 h) general operating procedure, affording good reaction yields, was achieved under microwave irradiation. Thus, a series of 35 molecules was obtained and evaluated in vitro on the K1 multi-resistant Plasmodium falciparum strain, in parallel with a cytotoxicity assessment on the human HepG2 cell line. 5 hit-molecules were identified, presenting both promising antiplasmodial activity (1.5 μM < IC50 < 2 μM) and low cytotoxicities (25 μM < CC50 < 45 μM). Apart for 2 molecules, the global series displayed a satisfying solubility in the aqueous biological media. Structure-activity relationships showed that the molecules presenting a benzyloxy moiety were less cytotoxic than the ones bearing a phenoxy moiety at position 4 of the quinazoline ring. It also appeared that the introduction of a heteroaryl moiety afforded inactive compounds. Finally, the most active and selective molecules (Selectivity Index = 22-27) were the ones presenting either an unsubstituted benzyloxy group or a phenoxy group, this last bearing a p-bromo or an o-acetyl substituent.

Knowledge Graph

Similar Paper

Looking for new antiplasmodial quinazolines: DMAP-catalyzed synthesis of 4-benzyloxy- and 4-aryloxy-2-trichloromethylquinazolines and their in vitro evaluation toward Plasmodium falciparum
European Journal of Medicinal Chemistry 2016.0
Targeting the human malaria parasite Plasmodium falciparum: In vitro identification of a new antiplasmodial hit in 4-phenoxy-2-trichloromethylquinazoline series
European Journal of Medicinal Chemistry 2011.0
Synthesis and in vitro antiplasmodial evaluation of 4-anilino-2-trichloromethylquinazolines
Bioorganic &amp; Medicinal Chemistry 2009.0
Synthesis and antiplasmodial activity of new 4-aryl-2-trichloromethylquinazolines
Bioorganic &amp; Medicinal Chemistry Letters 2008.0
4-Thiophenoxy-2-trichloromethyquinazolines display in vitro selective antiplasmodial activity against the human malaria parasite Plasmodium falciparum
Bioorganic &amp; Medicinal Chemistry Letters 2011.0
Synthesis and in vitro evaluation of 4-trichloromethylpyrrolo[1,2-a]quinoxalines as new antiplasmodial agents
European Journal of Medicinal Chemistry 2014.0
Discovery of new hit-molecules targeting Plasmodium falciparum through a global SAR study of the 4-substituted-2-trichloromethylquinazoline antiplasmodial scaffold
European Journal of Medicinal Chemistry 2017.0
Original quinazoline derivatives displaying antiplasmodial properties
European Journal of Medicinal Chemistry 2010.0
Antiplasmodial 2-thiophenoxy-3-trichloromethyl quinoxalines target the apicoplast of Plasmodium falciparum
European Journal of Medicinal Chemistry 2021.0
2-Aminopyrimidine based 4-aminoquinoline anti-plasmodial agents. Synthesis, biological activity, structure–activity relationship and mode of action studies
European Journal of Medicinal Chemistry 2012.0