Oxidative cyclization reagents reveal tryptophan cation–π interactions

Xiao Xie, Patrick J. Moon, Steven W. M. Crossley, Amanda J. Bischoff, Dan He, Gen Li, Nam V. Dao, Angel Gonzalez-Valero, Audrey G. Reeves, Jeffrey M. McKenna, Susanna K. Elledge, James A. Wells, F. Dean Toste, Christopher J. Chang