Metal-free catalyzed oxidative trimerization of indoles by using TEMPO in air: a biomimetic approach to 2-(1H-indol-3-yl)-2,3′-biindolin-3-ones
作者:Wen-Bing Qin、Qiong Chang、Yun-Hong Bao、Ning Wang、Zheng-Wang Chen、Liang-Xian Liu
DOI:10.1039/c2ob26390d
日期:——
simple, convenient and efficient metal-free catalyzed oxidative trimeric reaction of indoles toward a variety of 2-(1H-indol-3-yl)-2,3′-biindolin-3-one derivatives in moderate to excellent yields has been developed. This transformation proceeds via a tandem oxidative homocoupling reaction by using TEMPO in air as an environmentally benign oxidant. This methodology provides an alternativeapproach for the
Silver-catalyzed TEMPO oxidative homocoupling of indoles for the synthesis of 3,3′-biindolin-2-ones
作者:Feng Lin、Yu Chen、Baoshuang Wang、Wenbing Qin、Liangxian Liu
DOI:10.1039/c5ra04106f
日期:——
A silver-catalyzed TEMPO oxidative homo dimerization of indoles was first successful demonstrated. This new methodology is both atom and step efficient, allowing the synthesis of substituted C3–C3′ bisindolin-2-ones in moderate to excellent yields.
From indoles to 3,3′-biindolin-2-ones: copper-catalyzed oxidative homocoupling of indoles
作者:Xiangjun Peng、Yong Zeng、Hai Liu、Xianyun Xu、Minhong Zhang、Qian Liu
DOI:10.1039/c9nj03620b
日期:——
A copper-catalyzed intermolecular oxidative homocoupling of indoles has been developed for the direct construction of valuable C3–C3 biindolyl scaffolds. Using this protocol, 3,3′-bisindolin-2-ones are obtained in good yields and with excellent chemo- and regioselectivity. The methodology shows good functional group tolerance, allows the use of easily available inexpensive precursors, has simple operation