1: thiophene With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; hexane T=-78 - 20°C; 2: With zinc(II) chloride in tetrahydrofuran; hexane T=20°C; 1 h; 3: 2-Bromo-5-nitrothiophene With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran; hexane T=20°C;

bis-triphenylphosphine-palladium(II) chloride in tetrahydrofuran 20 h; Heating;

in acetonitrile 1 h; Irradiation;

nitric acid; acetic anhydride

in acetonitrile 10 h; Irradiation;

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