1: bromobenzoic acid chloride With tetrakis(triphenylphosphine) palladium(0); triethylamine in tetrahydrofuran T=20°C; Sonogashira cross-coupling; Inert atmosphere; 2: With copper(l) iodide in tetrahydrofuran T=20°C; Sonogashira cross-coupling; Inert atmosphere; 3: 1-chloro-4-ethynylbenzene in tetrahydrofuran T=20°C; Sonogashira cross-coupling; Inert atmosphere;