Copper-Catalyzed Isomerization and Cyclization of<i>E</i>/<i>Z</i>-<i>o</i>-Haloaryl<i>N</i>-Sulfonylhydrazones: Convenient Access to 1<i>H</i>-Indazoles
作者:Xue-Qing Zhu、Shuai Mao、Dong-Dong Guo、Bin Li、Shi-Huan Guo、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1002/cctc.201601243
日期:2017.3.20
application in a broad range of chemical transformations. Generally, this isomerization can be realized either photochemically or thermally. A new isomerization approach is presented, namely a copper‐catalyzed C=N double bond isomerization of hydrazones, which is followed by an efficient intramolecular C−N coupling reaction, providing an unprecedented catalytic approach for the synthesis of 1H‐indazoles
中C = N双键的异构化已经引起了广泛的关注,因为它具有广泛的化学转化应用潜力。通常,该异构化可以通过光化学或热方法实现。提出了一种新的异构化方法,即的铜催化的C = N双键异构化,然后进行有效的分子内C-N偶联反应,为从易于获得的1 H-吲唑合成提供了前所未有的催化方法邻卤代芳基N磺酰基hydr的Z / E混合物。