RESUMO
A clean arylation protocol of ethyl acetoacetate was developed using hypervalent diaryliodonium salts under mild and metal-free conditions. The scope of the reaction, using symmetric and unsymmetric iodonium salts with varying sterics and electronics, was examined. Further, this method has been applied for the synthesis of antimalarial compound ELQ-300, which is currently in preclinical development.
Assuntos
Acetoacetatos/química , Antimaláricos/síntese química , Iodo/química , Metais/química , Oniocompostos/química , Quinolinas/síntese química , Quinolonas/síntese química , Quinolonas/farmacologia , Antimaláricos/química , Estrutura Molecular , Quinolinas/química , Quinolonas/químicaRESUMO
ICI 56,780 (5) displayed causal prophylactic and blood schizonticidal activity (ED50=0.05 mg/kg) in rodent malaria models but produced rapid acquisition of parasitological resistance in P. berghei infected mice. Herein we describe the synthesis of analogues of 5 with EC50 as low as 0.15 nM against multidrug resistant P. falciparum. Optimal activity with low cross-resistance indexes (RI) to atovaquone was achieved by introducing ortho-substituted aryl moieties at the 3-position of the 7-(2-phenoxyethoxy)-4(1H)-quinolone core.