To further demonstrate the synthetic utility, the one-pot amidation reaction involving three consecutive steps was attempted. The process is compatible with the model reaction, after three steps, the total yield equals 55% and regioselectivity did not erode (Scheme 4). To gain a better understanding of the developed reaction, we conducted a series of control experiments. They indeed confirmed the relevance of both the light and the catalyst. The radical nature of the mechanism was confirmed by an experiment with the addition of TEMPO which halted the reaction completely. DMPO, a radical spin trap was added to the reaction mixture; which formed an adduct with the radical generated from the N-amino-pyridinium salt and confirmed by ESI-MS analysis (Figure ). Furthermore, kinetic experiments revealed that amidated Zincke imine 2 forms gradually over 13 hours (Figure ). Due to its instability, the isolated yield was only 15% yield, but it allowed us to confirm its structure by NMR spectroscopy and X-ray crystallography (Figure ).