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