AbstractPharmacological properties of a bioactive molecule can be improved significantly by placing a fluoroalkyl group on its scaffold. However, direct stitching of fluoroalkyl groups to aromatic compounds via C−H bond activation or insertion reaction is a difficult task, thus challenging and of high demand. Herein, an alternative to the Friedel‐Crafts alkylation, we describe an uncharted strategy for selective and efficient trifluoroethylation of indole that relies on iron(III)‐catalyzed C−H activation of aromatic compounds and proceeds via Fe(III)‐carbene insertion into C(sp2)−H bond of indole using trifluoroacetaldehyde N‐triftosylhydrazone as a carbene precursor and FeTPPCl as catalyst.
摘要通过在生物活性分子的支架上加入氟烷基,可以显著改善其药理特性。然而,通过 C-H 键活化或插入反应将氟烷基直接缝合到芳香化合物上是一项艰巨的任务,因此具有挑战性和高要求。在本文中,我们介绍了一种替代 Friedel-Crafts 烷基化反应的未知策略,即以三氟乙醛 N-triftosylhydrazone为碳烯前体,FeTPPCl 为催化剂,依靠铁(III)催化芳香族化合物的 C-H 活化,并通过铁(III)-碳烯插入吲哚的 C(sp2)-H 键,从而实现吲哚的选择性高效三氟乙基化反应。