Single-Electron-Transfer (SET)-Induced Oxidative Biaryl Coupling by Polyalkoxybenzene-Derived Diaryliodonium(III) Salts
作者:Nobutaka Yamaoka、Kohei Sumida、Itsuki Itani、Hiroko Kubo、Yusuke Ohnishi、Sho Sekiguchi、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1002/chem.201301148
日期:2013.10.25
Metal‐free oxidative CC coupling by using polyalkoxybenzene‐derived diaryliodonium(III) salts as both the oxidant and aryl source has been developed. These salts can induce single‐electron‐transfer (SET) oxidation to yield electron‐rich arenes and subsequently transfer the polyalkoxyphenyl group into in situ generated aromatic radical cations to produce biaryl products. The reaction is promoted by
通过使用聚烷氧基苯衍生的二芳基碘鎓盐(III)作为氧化剂和芳基源,开发了无金属的氧化CC偶联剂。这些盐可以诱导单电子转移(SET)氧化,生成富电子芳烃,随后将聚烷氧基苯基基团转移到原位生成的芳族自由基阳离子中,生成联芳基产物。该反应通过激活碘鎓盐的路易斯酸来促进。已经发现,盐在酸性条件下的反应性与它们在碱性条件下的已知行为有很大不同。一系列碘盐在SET氧化中的反应性偏好及其配体转移能力已得到系统地研究,其结果在本报告中进行了总结。