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...
Direct synthesis of 3,5‐diaryl‐1,2,
<scp>4‐oxadiazoles</scp>
using 1‐(2‐oxo‐2‐arylethyl)pyridin‐1‐iums with benzamidines
作者:Yue Zhang、Chengjun Wu、Xinyi Wan、Cunde Wang
DOI:10.1002/jhet.4354
日期:2021.12
An efficient domino protocol for the synthesis of 1,2,4-oxadiazole derivatives from readily available 1-(2-oxo-2-arylethyl)pyridin-1-iums and amidine hydrochlorides was developed. In this practical approach, N-acyl amidine precursors were formed firstly via a simple nucleophilic substitution, without the purification of N-acylamidine intermediates, and the following intramolecularly dehydrative cyclization
开发了一种用于从容易获得的 1-(2-oxo-2-arylethyl)pyridin-1-iums 和脒盐酸盐合成 1,2,4-恶二唑衍生物的有效多米诺协议。在该实用的方法,Ñ酰基脒前体通过简单的亲核取代首先形成,未经纯化Ñ -acylamidine中间体和分子内下列脱水闭环中的我的存在下,得到1,2,4-恶二唑衍生物2 / K 2 CO 3 /DMSO 表现出优异的官能团耐受性并在简单的实验条件下进行。
Electrochemical synthesis of 1,2,4-oxadiazoles from amidoximes through dehydrogenative cyclization
作者:Chan Jiang、Mingfang Li、Leitao Xu、Yangjie Yi、Jiao Ye、Aixi Hu
DOI:10.1039/d1ob02040d
日期:——
through anodic oxidation was developed for the synthesis of 3,5-disubstituted 1,2,4-oxadiazoles from N-benzyl amidoximes. The transformation proceeds through 1.5-Hydrogen Atom Transfer (1,5-HAT) and intramolecular cyclization. The process features simple operation, mild conditions, broad substrate scope and high functional group compatibility, and provides a facile and practical way for the preparation of
Palladium-Catalyzed, Silver-Assisted Direct C-5-H Arylation of 3-Substituted 1,2,4-Oxadiazoles under Microwave Irradiation
作者:Shan Li、Penghui Wan、Jing Ai、Rong Sheng、Yongzhou Hu、Youhong Hu
DOI:10.1002/adsc.201600913
日期:2017.3.6
arylation of 3‐substituted 1,2,4‐oxadiazoles with aryl iodides in the presence of a palladium catalyst and silver acetate is reported. This method provides a rapid, reliable way to obtain versatile 3,5‐diaryl‐1,2,4‐oxadiazole derivatives, which are common moieties of many biologically active molecules. The synthetic applications of this novel method have been demonstrated in the concise syntheses of Ataluren