Electrochemical Azidooxygenation of Alkenes Mediated by a TEMPO–N<sub>3</sub> Charge-Transfer Complex
作者:Juno C. Siu、Gregory S. Sauer、Ambarneil Saha、Reed L. Macey、Niankai Fu、Timothée Chauviré、Kyle M. Lancaster、Song Lin
DOI:10.1021/jacs.8b06744
日期:2018.10.3
this charge-transfer complex. Kinetic and kinetic isotopic effect studies revealed that reversible dissociation of TEMPO-N3 into TEMPO• and azidyl precedes the addition of these radicals across the alkene in the rate-determining step. The resulting azidooxygenated product could then be easily manipulated for further synthetic elaborations. The discovery of this new reaction pathway mediated by the TEMPO+/TEMPO•
我们报告了一种温和高效的电化学方案,可以从简单的烯烃中获得各种邻位 CO 和 CN 双官能化化合物。详细的机理研究揭示了与之前报道的 TEMPO 介导反应不同的反应途径。在该机制中,电化学产生的氧铵离子通过与叠氮化物TEMPO-N3 形成电荷转移络合物,促进叠氮基自由基的形成。 DFT 计算与光谱表征一起提供了该电荷转移复合物的初步结构分配。动力学和动力学同位素效应研究表明,在速率决定步骤中,TEMPO-N3 可逆解离为 TEMPO• 和叠氮基,然后这些自由基在烯烃上加成。然后可以轻松地操作所得的叠氮氧化产物以进行进一步的合成精制。这种由 TEMPO+/TEMPO• 氧化还原对介导的新反应途径的发现可能会扩大合成环境中氨氧基自由基化学的范围。
Radical Oxyazidation of Alkenes in Pure Water
作者:Huan Zhou、Yajun Li、Jinfeng Cui、Hongli Bao
DOI:10.1055/a-1804-8859
日期:2022.7
organic solvents, such reactions with water as the sole solvent are rarely reported. Concerning the global consensus on environmental issues, we have developed herein a method for the radical oxyazidation of alkenes in pure water. This reaction allows the construction of C–N and C–O bonds in a one-pot process. Styrenes, 1,3-dienes, and unactivated alkenes react smoothly under mild and environmentally