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。
HYPERVALENT IODINE IN SYNTHESIS. 75. A CONVENIENT SYNTHESIS OF OXADIAZOLES BY PALLADIUM-CATALYZED CARBONYLATION AND CYCLIZATION OF DIARYLIODONIUM SALTS AND AMIDOXIMES
作者:Tao Zhou、Zhen-Chu Chen
DOI:10.1081/scc-120002699
日期:2002.1.1
ABSTRACT 3,5-Disubstituted-1,2,4-oxadiazoles were prepared in one-pot procedure in moderate yields via the palladium-catalyzed carbonylation of diaryliodonium salts with amidoximes under one atmosphere of carbon monoxide followed by intramolecular dehydrative cyclization.
Clean one-pot synthesis of 1,2,4-oxadiazoles under solvent-free conditions using microwave irradiation and potassium fluoride as catalyst and solid support
作者:Shahnaz Rostamizadeh、Hamid Reza Ghaieni、Reza Aryan、Ali Mohammad Amani
DOI:10.1016/j.tet.2009.11.063
日期:2010.1
Potassium fluoride was found to be an efficient catalyst and solid support for the synthesis of 3,5-disubstituted-1,2,4-oxadiazoles. In this work, a one-pot method for the synthesis of these compounds from the reaction of nitriles with hydroxylamine hydrochloride and acyl chloride in the presence of potassium fluorideundersolvent-free conditions using microwave irradiation has been developed. The
PTSA-ZnCl2 has been proved to be an efficient and mild catalyst for the synthesis of 3,5-disubstituted-1,2,4-oxadiazoles from amidoximes and organic nitriles.
Reaction of Oximes of α-Diketones with Diphosphorous Tetraiodide for Preparation of Oxadiazoles and Nitriles
作者:Vikas N. Telvekar、Balaram S. Takale
DOI:10.1080/00397911.2011.595035
日期:2013.1
Abstract The utility of diphosphorous tetraiodide as a new, mild, condensing agent for synthesis of oxadiazole is described. These data indicate the simple dehydration of oximes to 1,2,5-oxadiazole as well as the rearrangements of oximes to normal Beckmann product 1,2,4-oxadiazole. However, mono-oxime of benzil undergoes abnormal Beckman rearrangement to benzaldehyde as major product. The described