1: With n-butyllithium in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere; 2: With boric acid trimethyl ester in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere;

1.1: tetrakis (triphenylphosphine) palladium (0) / tetrahydrofuran / 0.5 h / |Inert atmosphere 1.2: 0.33 h / 80 °C / |Inert atmosphere 2.1: n-butyllithium / tetrahydrofuran; hexane / 1.5 h / -78 °C / |Inert atmosphere 2.2: 0.5 h / -78 °C / |Inert atmosphere 2.3: 5 h / -78 - 20 °C / |Inert atmosphere View Scheme