Trichloroisocyanuric Acid–Mediated One-Pot Synthesis of Unsymmetrical 2,5-Disubstituted 1,3,4-Oxadiazoles at Ambient Temperature
作者:D. M. Pore、S. M. Mahadik、U. V. Desai
DOI:10.1080/00397910802054289
日期:2008.8.29
method for the one-pot synthesis of unsymmetrical 2,5-disubstituted1,3,4-oxadiazoles has been developed using trichloroisocyanuric acid (TCCA) at ambient temperature. A wide variety of aromatic as well as heterocyclic aldehydes exhibit condensation with a variety of acylhydrazines followed by oxidative cyclization to yield corresponding unsymmetrical 2,5-disubstituted1,3,4-oxadiazoles. The mild nature
An Expeditious and Convenient One Pot Synthesis of 2,5-Disubstituted-1,3,4-oxadiazoles
作者:Sabir H. Mashraqui、Shailesh G. Ghadigaonkar、Rajesh S. Kenny
DOI:10.1081/scc-120021845
日期:2003.1.8
Abstract A convenient, one pot procedure is reported for the synthesis of a variety of 2,5-disubstituted-1,3,4-oxadiazoles by condensing mono-arylhydrazides with acid chlorides in HMPA solvent under the microwave heating. The yields are good to excellent, the process is rapid and does not need any added acid catalyst or dehydratingreagent.
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.