Synthesis and biological evaluation of a new series of 4-alkoxy-2-arylquinoline derivatives as potential antituberculosis agents
作者:Gonca TOSUN、Tayfun ARSLAN、Zeynep İSKEFİYELİ、Murat KÜÇÜK、Şengül ALPAY KARAOĞLU、Nurettin YAYLI
DOI:10.3906/kim-1501-112
日期:——
Three new series of 33 quinolone compounds, 2-(2-, 3-, and 4-fluorophenyl)-4-O-alkyl(C$_5-15})$quinolines (7a-k, 8a-k, and 9a-k), were synthesized from 2-(2-, 3-, and 4-fluorophenyl)-2,3-dihydroquinolin-4(1H)-one (4, 5, and 6) by the reaction of alkyl halides under basic conditions in DMF. The new compounds 7a-k, 8a-k, and 9a-k were synthesized from flavonones 4-6, which can be considered new precursors for quinoline synthesis through a one-step reaction. All the target compounds (7a-k, 8a-k, and 9a-k) were evaluated for their in vitro antimicrobial activity against nine test microorganisms. They showed the most activity against Mycobacterium smegmatis with minimum inhibitory concentrations (MIC) of 62.5-500 $\mu $g/mL, indicating their potential uses as antituberculosis agents. Among them 8a-k (m-fluoride) were the most active compounds against M. smegmatis (MIC, 62.5-125 $\mu $g/mL). The newly synthesized title compounds were also evaluated for their in vitro antioxidant activities using DPPH• radical scavenging and FRAP tests. They showed at a low concentration (mg/mL) a range of SC$_50}$ values of 0.03-12.48 mg/mL (DPPH•) and 0-722 $\mu $M (FRAP), respectively. The antioxidant results of compounds 7a-k, 8a-k, and 9a-k revealed that the length of the alkyl chain was negatively correlated with antioxidant capacity.
合成了3个系列共33种喹诺酮化合物:2-(2-、3-和4-氟苯基)-4-O-烷基(C$_5-15}$)喹诺啉(7a-k、8a-k和9a-k),由2-(2-、3-和4-氟苯基)-2,3-二氢喹啉-4(1H)-酮(4、5和6)在DMF中用卤代烷在碱性条件下反应制得。新化合物7a-k、8a-k和9a-k由黄酮酮4-6制备,可视为一步反应合成喹诺啉的新前体。所有目标化合物(7a-k、8a-k和9a-k)均对其体外抗菌活性进行了评价,在九种试验微生物中它们对耻垢分枝杆菌的活性最强,最高抑制浓度(MIC)为62.5-500 $\mu g/ mL,表明它们有可能用作抗结核剂。其中8a-k(间氟苯基)对耻垢分枝杆菌的活性最强(MIC, 62.5-125 $\mu g/ mL)。新合成的标题化合物也用DPPH•自由基清除法和FRAP法对其体外抗氧化活性进行了评价。它们在低浓度(mg/mL)下的SC$_50}$值范围分别为0.03-12.48 mg/mL(DPPH•)和0-722 $\mu M$(FRAP)。化合物7a-k、8a-k和9a-k的抗氧化结果表明,烷基链的长度与抗氧化能力负相关。