Entry	Catalyst	% yielda
1	1	86 ± 5 (13 h)
2	2	35 (13 h)

^aFor details see ref. 25 and 50.

^bYields are mean ± standard deviation of measurements performed at least in duplicate. Reactions were run on a 0.05 mmol scale. Product yields were determined by ¹H NMR using mesitylene as an internal standard.

^cFor the oxidative coupling of benzylamine, ESI-MS was further used to confirm the presence of the desired product ([M + H]⁺m/z = 256.09).