已经开发了钯催化的好氧氧化C–H硝化和芳烃与简单易用的亚硝酸叔丁酯(TBN)和甲苯作为自由基前体的酰化反应。分子氧被用作末端氧化剂和氧源以引发活性自由基反应物。在这些新颖的转化中可以使用许多不同的导向基团,例如吡啶,嘧啶,吡唑,吡啶醇,吡啶基酮,肟和偶氮基团。通过自由基过程的Pd II / Pd IV催化循环是这些氧化的CH–H硝化和酰化反应的最可能途径。
Rhodium(III)-Catalyzed Azidation and Nitration of Arenes by CH Activation
作者:Fang Xie、Zisong Qi、Xingwei Li
DOI:10.1002/anie.201305902
日期:2013.11.4
nitrite served as readily available nitrogen sources, and pyridine, pyrimidine, and pyrazole substituents were efficient directing groups (DGs; see scheme; Cp*=C5Me5). The synthetic utility of the azidation products was demonstrated in subsequent functional‐group transformations.
掌握解决方案:在存在高价碘氧化剂的螯合辅助标题反应中,叠氮化钠和亚硝酸钠是易于获得的氮源,吡啶,嘧啶和吡唑取代基是有效的导向基团(DG;参见方案; Cp * = C 5 Me 5)。叠氮化产物的综合效用在随后的功能组转化中得到了证明。
Aerobic Oxidation of Pd<sup>II</sup> to Pd<sup>IV</sup> by Active Radical Reactants: Direct C–H Nitration and Acylation of Arenes via Oxygenation Process with Molecular Oxygen
oxidative C–H nitration and acylation of arenes with simple and readily available tert-butyl nitrite (TBN) and toluene as the radical precursors has been developed. Molecular oxygen is employed as the terminal oxidant and oxygen source to initiate the active radical reactants. Many different directing groups such as pyridine, pyrimidine, pyrazole, pyridol, pyridylketone, oxime, and azo groups can be employed
已经开发了钯催化的好氧氧化C–H硝化和芳烃与简单易用的亚硝酸叔丁酯(TBN)和甲苯作为自由基前体的酰化反应。分子氧被用作末端氧化剂和氧源以引发活性自由基反应物。在这些新颖的转化中可以使用许多不同的导向基团,例如吡啶,嘧啶,吡唑,吡啶醇,吡啶基酮,肟和偶氮基团。通过自由基过程的Pd II / Pd IV催化循环是这些氧化的CH–H硝化和酰化反应的最可能途径。