Copper-Catalyzed Direct Synthesis of 1,2,4-Oxadiazoles from Amides and Organic Nitriles by Oxidative N-O Bond Formation
作者:Malleswara Rao Kuram、Woo Gyum Kim、Kyungjae Myung、Sung You Hong
DOI:10.1002/ejoc.201501502
日期:2016.1
Cu-catalyzed one-step method for the synthesis of 1,2,4-oxadiazolesfrom stable, less toxic, and readily available amides and organicnitriles by a rare oxidativeN–Obondformation using O2 as sole oxidant. This method has a broad substrate scope and a good tolerance for diverse functional groups. Moreover, the synthetic utility of this method is highlighted by the synthesis of biologically active 3,5-disubstituted
在此,我们报告了第一个 Cu 催化一步法,通过使用 O2 作为唯一的稀有氧化 N-O 键,从稳定、毒性较低且易于获得的酰胺和有机腈合成 1,2,4-恶二唑。氧化剂。该方法具有广泛的底物范围和对不同官能团的良好耐受性。此外,该方法的合成效用通过具有生物活性的 3,5-二取代衍生物的合成而突出。
Thiol-promoted intermolecular cyclization to synthesize 1,2,4-oxadiazoles including tioxazafen under transition metal-free conditions
and efficient one-pot intermolecular annulation reaction for the synthesis of 1,2,4-oxadiazoles from amidoximes and benzyl thiols has been developed, in which benzyl thiols act as not only reactants but also organo-catalysts. The control experiments proved that thiol substrates could facilitate the dehydroaromatization step. High yield, functional group diversity and transitionmetal-free, extra oxidant-free
Synthesis and evaluation of 1,2,4-oxadiazole derivatives as potential anti-inflammatory agents by inhibiting NF-κB signaling pathway in LPS-stimulated RAW 264.7 cells
In this study, a series of compounds with 1,2,4-oxadiazole core was designed and synthesized for the optimi-zation of JC01, an anti-inflammatory hit identified from our in-house compound library using NF-xB pathway luciferase assay and NO production assay. All the synthetic compounds 1-29 have been screened for their anti-inflammatory effects by evaluating their inhibition against LPS-induced NO release, and compound 17 exhibited the highest activity. Western blotting and immunofluorescence analysis revealed that 17 prominently inhibited LPS-induced activation of NF-kappa B in RAW264.7 cells and blocked the phosphorylation of p65. Consistent with these results, it was found that 17 prevented the nuclear translocation of NF-kappa B induced by LPS. These data highlighted 17 as a promising anti-inflammatory agent by inhibiting NF-kappa B activity.