A series of indoles could be synthesized with excellent regioselectivity with PISA and 2-alkenylanilines. In this reaction, PISA acted both as an oxidant and as a Brønsted acid.

参考文献：

Xia, H.; Zhang, Y.; Wang, Y.; Zhang, C. Water-Soluble Hypervalent Iodine(III) Having an I-N Bond. A Reagent for the Synthesis of Indoles. Org. Lett. 2018, 20, 4052-4056.