potassium carbonate in N,N-dimethyl-formamide T=135°C; 10 h;

potassium phosphate; 2-di-tert-butylphosphino-2',4',6'-tricyclohexyl-3,6-dimethoxybiphenyl in ethylene glycol dimethyl ether; toluene T=80°C; 24 h; Inert atmosphere;

hydrazine in ethanol 24 h; Heating / reflux;