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。
A facile approach to synthesize 3,5-disubstituted-1,2,4-oxadiazoles via copper-catalyzed-cascade annulation of amidines and methylarenes
Various 3,5-disubstituted-1,2,4-oxadiazoles are smoothly formed via copper-catalyzed cascade annulation of amidines and methylarenes. This tandem oxidation-amination-cyclization transformation represents a straightforward protocol to prepare 1,2,4-oxadiazoles from easily available starting materials, with...
A reaction involving an efficient NBS-mediated oxidative N‒O bond formation has been established for the synthesis of 1,2,4-oxadiazoles from readily accessible N-acyl amidines. The features of this synthetic method include simplicity of operation, mild reaction conditions, short reaction times, high yields, and eco-friendliness. The reaction also works well with crude N-acyl amidines obtained by amidation
A simple base-mediated one-pot synthesis of 3,5-disubstituted 1,2,4-oxadiazoles from nitriles, aldehydes and hydroxylamine hydrochloride has been developed, in which the aldehydes act as both substrates and oxidants. The reactions include three sequential procedures: base-promoted intermolecular addition of hydroxylamine to nitrile to lead to amidoxime, treatment of the amidoxime with an aldehyde to
Copper‐Catalyzed Three‐Component Cascade Reaction of Benzaldehyde with Benzylamine and Hydroxylamine or Aniline: Synthesis of 1,2,4‐Oxadiazoles and Quinazolines
作者:Chao Wang、Xiyan Rui、Dongjuan Si、Rupeng Dai、Yueyue Zhu、Hongmei Wen、Wei Li、Jian Liu
DOI:10.1002/adsc.202001535
日期:2021.6.8
The analogous three-component synthesis strategy for substituted 1,2,4-oxadiazole and quinazoline derivatives from readily available benzaldehyde, benzylamine and hydroxylamine or aniline has been developed. Both the cascade reaction sequences involves nucleophilic addition of C−N bond, introduction a halogen donor, nucleophilic substitution and Cu(II)-catalyzed aerobic oxidation. This synthesis methodology