Functionalization of Azacalixaromatics by Cu(II)-Catalyzed Oxidative Cross-Coupling Reaction between the Arene C–H Bond and Boronic Acids
作者:Yang Liu、Chao Long、Liang Zhao、Mei-Xiang Wang
DOI:10.1021/acs.orglett.6b02530
日期:2016.10.7
Catalyzed by Cu(ClO4)2·6H2O under mild aerobic conditions using air as the oxidant, azacalix[1]arene[3]pyridines underwent a highly efficient oxidative cross-coupling reaction with a large number of aryl-, alkenyl-, and alkylboronic acids to afford diverse functionalized macrocycles. Stoichiometric reactions of an arylboronic acid with isolated and structurally well-defined high valent organocopper
Synthesis of Functionalized Azacalix[1]arene[3]pyridine Macrocycles from Cu(II)-Mediated Direct Amination Reactions of Arene through High Valent Arylcopper(III) Intermediates
作者:Yang Liu、Qian Zhang、Qing-Hui Guo、Mei-Xiang Wang
DOI:10.1021/acs.joc.6b01448
日期:2016.11.4
presence of K3PO4 under mild conditions, azacalix[1]arene[3]pyridines underwent arene C–H bond amination with a number of sulfonamides, imides, and saccharin to afford the diverse C–N bond forming products. Based on different reactivity between arylcopper(II) and arylcopper(III) compounds toward nitrogen nucleophiles, the reaction proceeded most likely through arene C–H bond metalation via reactive arylcopper(III)
在温和条件下,在K 3 PO 4存在下,由Cu(ClO 4)2介导,对azacalix [1] arene [3]吡啶进行芳烃C-H键胺化反应,并用许多磺酰胺,酰亚胺和糖精进行处理,以提供多种C–N键形成产品。基于芳基铜(II)和芳基铜(III)化合物对氮亲核试剂的不同反应性,该反应最有可能通过芳烃铜键通过反应性芳基铜(III)中间体进行金属化以及它们与源自氮的去质子化的氮阴离子的结合而进行。 p K a的氮亲核试剂的酸性NH键(DMSO)<17.5,然后进行还原消除。该研究不仅提供了方便,直接的途径,以其他方式不易获得的官能化杂芳基芳烃,也丰富了我们对高价有机铜化学的理解。
Cu(OTf)<sub>2</sub>-Catalyzed Selective Arene C–H Bond Hydroxylation and Nitration with KNO<sub>2</sub> as an Ambident <i>O</i>- and <i>N</i>-Nucleophile via a Cu(II)–Cu(III)–Cu(I) Mechanism
作者:Hu Zhang、Liang Zhao、De-Xian Wang、Mei-Xiang Wang
DOI:10.1021/ol401453f
日期:2013.8.2
Cu(OTf)2-catalyzed selective arene C–H bond hydroxylation and nitration reactions of azacalix[1]arene[3]pyridines were achieved using KNO2 as an ambident O- and N-nucleophile under very mild aerobic conditions to yield functionalized azacalixaromatics. The reaction, which selectivity between hydroxylation and nitration was modulated by the reaction medium employed, proceeded through a Cu(II)–Cu(III)–Cu(I) mechanism