1: 3-iodobenzo[b]thiophene With bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; N-ethyl-N,N-diisopropylamine in N,N-dimethyl-formamide T=20 - 80°C; Sonogashira coupling; Inert atmosphere; 2: trimethylsilylacetylene in N,N-dimethyl-formamide T=80°C; Sonogashira coupling; Inert atmosphere;

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copper(l) iodide; tetrakis(triphenylphosphine) palladium(0); triethylamine in tetrahydrofuran T=60°C; Sonogashira Cross-Coupling; Inert atmosphere;