Synthesis of 1,2,4-Oxadiazoles via DDQ-Mediated Oxidative Cyclization of Amidoximes
作者:Joshua Pierce、Patrick Parker
DOI:10.1055/s-0035-1561597
日期:——
cyclization of amidoximes to form 1,2,4-oxadiazoles, mediated by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), is described. A range of alkyl, aryl, and heteroaryl substrates are tolerated under these conditions. This reaction serves as an alternate approach for the synthesis of functionally diverse oxadiazoles via a rapid and straightforward synthetic procedure. An oxidative cyclization of amidoximes to form
Copper-catalyzed redox-neutral C–H amination with amidoximes
作者:Hui Chen、Shunsuke Chiba
DOI:10.1039/c3ob41871e
日期:——
CuI-catalyzed reactions of N-alkylamidoximes afforded dihydroimidazoles via sp3 CâH amination. On the other hand, the reactions of N-benzoylamidoximes resulted in sp2 CâH amination to form quinazolinones. The reaction mechanisms could be characterized as a redox-neutral radical pathway including a Cu(I)âCu(II) redox catalytic cycle.