已知三烷基铵(最显着的是N,N,N-三甲基苯铵)盐通过芳基和N-甲基均显示出双重反应性。因此,这些盐已广泛应用于交叉偶联,芳基醚化,氟放射性标记,相转移催化,超分子识别,聚合物设计和(最近)甲基化。然而,它们作为亲电甲基化试剂的应用仍未得到充分开发,并且缺乏对它们的芳基化与甲基化反应性的了解。本研究提出了N,N,N的机械降解分析。-三甲基苯胺盐,并突出了这一重要类别盐对合成应用的意义。在固相和固溶阶段的动力学降解研究已经深入了解了影响苯胺盐稳定性的物理和化学参数。盐降解的1 H NMR动力学分析表明,热降解为甲基碘和母体苯胺,与闭壳S N一致2位降解途径,而甲基碘是应用甲基化程序中的关键反应物种。此外,还研究了卤化物和非亲核抗衡离子对盐降解的影响,以及氘同位素和溶剂的影响。新的力学见解使人们能够研究三甲基苯胺盐在O-甲基化中的应用以及在改进的交叉偶联策略中的应用。最后,详细的计算研究有助于
Scalable, Metal- and Additive-Free, Photoinduced Borylation of Haloarenes and Quaternary Arylammonium Salts
作者:Adelphe M. Mfuh、John D. Doyle、Bhuwan Chhetri、Hadi D. Arman、Oleg V. Larionov
DOI:10.1021/jacs.6b01376
日期:2016.3.9
We report herein a simple, metal- and additive-free, photoinduced borylation of haloarenes, including electron-rich fluoroarenes, as well as arylammoniumsalts directly to boronic acids. This borylation method has a broad scope and functional group tolerance. We show that it can be further extended to boronic esters and carried out on gram scale as well as under flow conditions.
Selective Hofmann alkylation of aromatic-aliphatic diamines in the presence of carbon dioxide
作者:Alexei G. Balybin、Yuri M. Panov、Ludmila V. Erkhova、Dmitry A. Lemenovskii、Dmitry P. Krut’ko
DOI:10.1016/j.mencom.2019.07.028
日期:2019.7
Selective Hofmann alkylation at arylamino group in carbon dioxide medium was demonstrated on model diamines containing aliphatic and aromaticprimaryaminogroups, namely, 2-H2NC6H4CH2NH2, 3-H2NC6H4CH(Me)NH2, and 4-H2NC6H4CH2CH2NH2. Depending on the spatial factors, di- or trialkylarylammonium derivatives are selectively formed in amide solvents (DMF, DMA) without additional base.