Hao-Hui Zhang, Can Yang, Hao-Cheng Tian, Kuiyong Dong,* and Feng Shi*, Synthesis of N,N’-Bisindoles via Gold-Catalyzed Formal (4 + 1) Cycloaddition, Eur. J. Org. Chem. 2025, 2500193, DOI：10.1002/ejoc.202500193