1: meta-dibromobenzene With (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; potassium acetate; 4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl-4',4',5',5'-tetramethyl-1,3,2-dioxaborolane in N,N-dimethyl-formamide T=20°C; Suzuki-Miyaura coupling; Inert atmosphereHeating; 2: 2-chloro-1,3-benzothiazole With water; sodium hydroxide in N,N-dimethyl-formamide Suzuki-Miyaura coupling; 3 h; Inert atmosphereHeating;

triethylamine in tetrahydrofuran T=20°C;

sodium hydrogensulfite in ethanol 4 h; Heating;

1: aqueous NaOH-solution / 200 °C 2: 260 °C View Scheme

T=260°C;