Nickel-Catalyzed Reaction of Benzamides with Bicylic Alkenes: Cleavage of C–H and C–N Bonds
作者:Aymen Skhiri、Naoto Chatani
DOI:10.1021/acs.orglett.9b00351
日期:2019.3.15
The nickel-catalyzed reaction of aromatic amides that contain an 8-aminoquinoline as a directing group with bicyclic alkenes, such as norbornene and 1,4-dihydro-1,4-epoxynaphthalene, results in the cleavage of both the C–H bond at the ortho-position of the benzene ring and the C(O)–N bond to give methanofluoren-9-one and 1,4-epoxyfluoren-9-one derivatives. Both Ni(OTf)2 and Ni(cod)2 show a high catalytic
Cobalt catalyzed electrochemical [4 + 2] annulation for the synthesis of sultams
作者:Yangmin Cao、Yong Yuan、Yueping Lin、Xiaomei Jiang、Yaqing Weng、Tangwei Wang、Faxiang Bu、Li Zeng、Aiwen Lei
DOI:10.1039/d0gc00289e
日期:——
Cobalt catalyzed electrochemical [4 + 2] annulation of sulfonamides with alkynes is demonstrated in this work, which provided a practical and environmentally friendly way to synthesize structurally diverse sultams.
We report a method for cobalt-catalyzed, aminoquinoline-directed sp2 C–H bond carbonylation of sulfonamides. The reactions proceed in a dichloroethane solvent, and employ diisopropyl azodicarboxylate as a carbonmonoxide source, Mn(OAc)2 as a cooxidant and potassium pivalate as a base. Halogen, ester, and amide functionalities are compatible with the reaction conditions. This method allows for a short
Regioselective Access to Sultam Motifs through Cobalt-Catalyzed Annulation of Aryl Sulfonamides and Alkynes using an 8-Aminoquinoline Directing Group
作者:Oriol Planas、Christopher J. Whiteoak、Anna Company、Xavi Ribas
DOI:10.1002/adsc.201500690
日期:2015.12.14
The use of cobalt as catalyst in direct CH activation protocols as a replacement for more expensive second row transition metals is currently attracting significant attention. Herein we disclose a facile cobalt-catalyzed CH functionalization route towards sultammotifsthroughannulation of easily prepared arylsulfonamides and alkynesusing8-aminoquinoline as a directinggroup. The reaction shows
Sodium chlorate as a viable substoichiometric oxidant for cobalt-catalyzed oxidative annulation of aryl sulfonamides with alkynes
作者:You Ran、Yudong Yang、Luoqiang Zhang
DOI:10.1016/j.tetlet.2016.06.059
日期:2016.7
for the first time as an efficient and versatile oxidant in the catalytic C–H activation reaction. By using sodium chlorate as the oxidant, a highly regioselective cobalt-catalyzed oxidativeannulation of aryl sulfonamides with alkynes has been developed and can be extended to the annulation of benzamide.