Brønsted Base-Switched Selective Mono- and Dithiolation of Benzamides via Copper Catalysis
作者:Yi Jiang、Yi-yue Feng、Jiao-xia Zou、Shuai Lei、Xiao-ling Hu、Gao-feng Yin、Wen Tan、Zhen Wang
DOI:10.1021/acs.joc.9b01237
日期:2019.8.16
a catalytic amount of copper catalysis, by switching related Brønsted bases and regulating the reaction time, and the corresponding mono- and dithiolation products can be obtained selectively in moderate to good yields. The reaction exhibits a relatively broad substrate scope and a good functional group tolerance, even with different heterocyclic amides and alkyl thiols.
Cobalt(II)-Catalyzed Decarboxylative C–H Activation/Annulation Cascades: Regioselective Access to Isoquinolones and Isoindolinones
作者:Xin-Qi Hao、Cong Du、Xinju Zhu、Peng-Xiang Li、Jia-Heng Zhang、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.orglett.6b01632
日期:2016.8.5
A new cobalt(II)-catalyzed decarboxylative C–H activation/annulation of benzamides and alkynyl carboxylicacids has been described. Alkynyl carboxylicacids were first employed as the coupling partners using inexpensive Co(OAc)2·4H2O as the catalyst. This method enables a switchable cyclization to isoquinolones and isoindolinones with excellent selectivity. Moreover, a catalytic amount of Ag2O was
Ni(II)-Catalyzed C(sp<sup>2</sup>)–H Alkynylation/Annulation with Terminal Alkynes under an Oxygen Atmosphere: A One-Pot Approach to 3-Methyleneisoindolin-1-one
作者:Xin-Xiang Zheng、Cong Du、Xue-Mei Zhao、Xinju Zhu、Jian-Feng Suo、Xin-Qi Hao、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.joc.6b00129
日期:2016.5.20
A nickel(II)-catalyzed alkynylation/annulationcascade via doubleC–H cleavage has been successfully achieved. This methodology adopted a removable N,O-bidentate directing group with a broad range of amide substrates and terminal alkynes being well tolerated. The catalytic system allowed for atom-economical and environmentally benign one-pot construction of the corresponding 3-methyleneisoindolin-1-one
Electrochemical Cobalt-Catalyzed C–H Oxygenation at Room Temperature
作者:Nicolas Sauermann、Tjark H. Meyer、Cong Tian、Lutz Ackermann
DOI:10.1021/jacs.7b11025
日期:2017.12.27
Electrochemical cobalt-catalyzed C–H functionalizations were achieved in terms of C–H oxygenation under mild conditions at 23 °C. The robust electrochemical C–H functionalization was characterized by ample substrate scope, whereas mechanistic studies provided support for a facile C–H cleavage. The electrochemical cobalt-catalyzed C–H oxygenation proved viable on arenes and alkenes with excellent levels
Copper-Mediated Direct Alkoxylation of Arenes Using an <i>N</i>,<i>O</i>-Bidentate Directing System
作者:Lin-Bao Zhang、Xin-Qi Hao、Shou-Kun Zhang、Ke Liu、Baozeng Ren、Jun-Fang Gong、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/jo502005j
日期:2014.11.7
effective CuCl-mediated C—H alkoxylation of arenes and heteroarenes has been developed by using a 2-aminopyridine 1-oxide moiety as an N,O-bidentate directing group. The reaction proceeds smoothly using a broad range of substrates to afford o-alkoxylated benzoic and heteroaromatic amide products. Moreover, the reaction system shows remarkable compatibility when hexafluoroisopropanol is used as a coupling parter;