Oxidative cyclization of amidoximes and thiohydroximic acids: A facile and efficient strategy for accessing 3,5-disubstituted 1,2,4-oxadiazoles and 1,4,2-oxathiazoles
作者:Jatin J. Lade、Bhausaheb N. Patil、Kamlesh S. Vadagaonkar、Atul C. Chaskar
DOI:10.1016/j.tetlet.2017.04.045
日期:2017.5
A facile and practical protocol has been developed for the synthesis of 3,5-disubstituted 1,2,4-oxadiazoles and 1,4,2-oxathiazoles through oxidative cyclization of amidoximes and thiohydroximic acids, respectively at room temperature. Use of mild reaction conditions, inexpensive reagents, broad substrate scope and good to excellent yield of the products are the salient features of this protocol.
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.