Gold-Catalyzed Formal [3 + 2] Cycloaddition of Ynamides with 4,5-Dihydro-1,2,4-oxadiazoles: Synthesis of Functionalized 4-Aminoimidazoles
作者:Wei Xu、Gaonan Wang、Ning Sun、Yuanhong Liu
DOI:10.1021/acs.orglett.7b01469
日期:2017.6.16
A gold-catalyzed formal [3 + 2] cycloaddition of ynamides with 4,5-dihydro-1,2,4-oxadiazoles has been developed. The reaction provides a concise and regioselective access to highly functionalized 4-aminoimidazoles likely via the formation of an α-imino gold carbene intermediate followed by cyclization. 4,5-Dihydro-1,2,4-oxadiazole was found to act as an efficient N-iminonitrene equivalent in these
Synthesis of Vinyl Sulfides and Vinylamines through Catalytic Intramolecular Hydroarylation in the Presence of FeCl<sub>3</sub>and AgOTf
作者:Dahan Eom、Juntae Mo、Phil Ho Lee、Zhiming Gao、Sunggak Kim
DOI:10.1002/ejoc.201201270
日期:2013.1
A synthetic method was developed for the preparation of vinylsulfides and vinylamines from arylalkynyl phenyl sulfides and sulfonamides. Under mild conditions, a catalyticintramolecularhydroarylation reaction was carried out in the presence of FeCl3 and AgOTf (OTf = trifluoromethanesulfonate) in 1,2-dichloroethane. A variety of 1,2-dihydronaphthalenes, 2H-chromenes, and 1,2-dihydroquinolines containing