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 convenient and mild method for 1,2,4-oxadiazole preparation: cyclodehydration of O -acylamidoximes in the superbase system MOH/DMSO
Herein, we reported a general, convenient, and efficient synthesis of 3,5-disubstituted-1,2,4-oxadiazoles via cyclodehydration of O-acylamidoximes in the superbase system MOH/DMSO (M = Li, Na, K). Excellent isolated yields (up to 98%) were attained within short reaction times (10–20 min). In addition, mild reaction conditions and a simple work-up procedure allow the synthesis of a wide range of heat-labile
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
Synthesis of benzoic acids containing a 1,2,4-oxadiazole ring
作者:G. G. Krasouskaya、A. S. Danilova、S. V. Baikov、A. V. Kolobov、E. R. Kofanov
DOI:10.1007/s11172-015-0833-6
日期:2015.1
A new approach to the synthesis of 4and 3-(5-R-1,2,4-oxadiazol-3-yl)benzoic acids via a selective oxidation of 5-R-3-tolyl-1,2,4-oxadiazoles with air oxygen in the presence of a catalytic system based on cobalt acetate was suggested. This synthesis allowed us to obtain the products in higher yields and with shorter sequence of steps as compared to the known procedures.
Acyl Amidines by Pd-Catalyzed Aminocarbonylation: One-Pot Cyclizations and <sup>11</sup>C Labeling
作者:Jonas Rydfjord、Sara Roslin、Tamal Roy、Alaa Abbas、Marc Y. Stevens、Luke R. Odell
DOI:10.1021/acs.joc.2c02115
日期:——
Notably, carbon monoxide is generated ex situ from a solid CO source, and several productive palladium ligands were identified with complementary benefits and substrate scope. Furthermore, sequential one-pot, two-step protocols for the synthesis of 1,2,4-triazoles and 1,2,4-oxadiazoles via acyl amidine intermediates are reported. In addition, this approach was extended to isotopic labeling using [11C]carbon
本文报道了由 Pd(0) 催化的芳基卤化物、脒和一氧化碳羰基合成酰基脒的方案。值得注意的是,一氧化碳是从固体 CO 来源非原位产生的,并且确定了几种具有互补优势和底物范围的高效钯配体。此外,还报道了通过酰基脒中间体合成 1,2,4-三唑和 1,2,4-恶二唑的连续一锅法、两步法方案。此外,该方法还扩展到使用 [ 11 C] 一氧化碳进行同位素标记,从而首次合成11 C 标记的酰基脒以及11 C 标记的 1,2,4-恶二唑。