A.  Patra, Mukherjee, S., Das, T. Kanti, Jain, S., Gonnade, R. Ghanshyam, and Biju, A. T., ?N - heterocyclic - carbene - catalyzed umpolung of imines?, Angewandte Chemie International Edition, vol. 56, no. 10, pp. 2730 - 2734, 2017.