A range of 1,3,4‐oxadiazoles have been synthesized using a UV‐B activated flow approach starting from carboxylic acids and 5‐substituted tetrazoles. The application of UV light represents an attractive alternative to the traditional thermolytic approach and has demonstrated comparable efficiency and versatility, with a diverse substrate scope, including the incorporation of highly substituted amino
Flow synthesis of oxadiazoles coupled with sequential in-line extraction and chromatography
作者:Kian Donnelly、Marcus Baumann
DOI:10.3762/bjoc.18.27
日期:——
continuous flow process is reported for the synthesis of various 1,3,4-oxadiazoles via an iodine-mediated oxidative cyclisation approach. This entails the use of a heated packed-bed reactor filled with solid K2CO3 as a base. Using DMSO as solvent, this flow method generates the target heterocycles within short residence times of 10 minutes and in yields up to 93%. Scale-up of this flow process was
Direct Palladium‐Catalyzed C5‐Arylation of 1,3,4‐Oxadiazoles with Aryl Chlorides Promoted by Bis(di‐isopropylphosphino) Ferrocene
作者:Loris Gelin、Henri Sabbadin、Hélène Cattey、Paul Fleurat‐Lessard、Jean‐Cyrille Hierso、Julien Roger
DOI:10.1002/ejoc.202400212
日期:2024.6.3
The palladium-catalyzed direct arylation of 1,2,4-oxadiazoles proceeds efficiently at low catalyst loading (0.5 to 1 mol %) with the decisive assistance of sterically constrained ferrocenyldiphosphane ligands. This protocol tolerates electron-donating and electron-withdrawing substituents on the (heteroaryl)arylhalide.