1: β-naphthol With sodium hydride in N,N-dimethyl-formamide; mineral oil T=0 - 5°C; Inert atmosphere; 2: N,N-dimethylcarbamoyl chloride in N,N-dimethyl-formamide; mineral oil T=75°C; 1 h; Inert atmosphere;

Ni(PCy3)2Cl2; potassium carbonate; tri-cyclo-hexyl-phosphine in 1,4-dioxane; water T=110°C; Suzuki-Miyaura coupling; 16 h; Inert atmosphere;

Ni(PCy3)2Cl2; sodium t-butanolate; tri-cyclo-hexyl-phosphine in ethylene glycol dimethyl ether; toluene T=110°C; 24 h; Inert atmosphere;