1: With n-butyllithium in tetrahydrofuran T=-78°C; 2 h; 2: With boric acid trimethyl ester in tetrahydrofuran T=-78 - 20°C; 19 h; 3: With hydrogenchloride in tetrahydrofuran; water T=20°C;

tetrabutylammomium bromide; potassium carbonate; palladium diacetate in ethanol; water T=150°C; 0.166667 h; Irradiation;