1: C27H37ClCuN3; potassium tert-butylate / tetrahydrofuran / 8 h / 80 °C / 760.05 Torr / Inert atmosphere; sealed tube 2: N,N-dimethyl-formamide / 1 h / 80 °C / Inert atmosphere; sealed tube View Scheme

in N,N-dimethyl-formamide T=80°C; 1 h; Inert atmospheresealed tube;