... a General conditions: CuCl 2 ·H 2 O (0.2 equiv), ligand (0.2 equiv), base (2.25 equiv), O 2 (1 atm), cyanamide 14a (1.0 equiv), p-tolylboronic acid 13a, piperidine 11a, toluene, 100 °C, 24 h. b ... e ... g Reaction performed with 2.0 equiv of CuCl 2 ·H 2 O and ligand under N 2 . h ...