1.1: (-)-sparteine; sec.-butyllithium / 3 h / -78 °C / |Inert atmosphere; |Schlenk technique 1.2: -78 °C / |Inert atmosphere; |Schlenk technique 2.1: tetrafluoroboric acid diethyl ether complex / dichloromethane / 0.5 h / 0 °C / |Inert atmosphere; |Schlenk technique 2.2: 1 h / |Inert atmosphere; |Schlenk technique View Scheme

1: With sec.-butyllithium in diethyl ether; hexane T=-78°C; 3 h; Inert atmosphere; 2: With copper dichloride in diethyl ether; hexane T=-78 - 20°C; 15 h; Inert atmosphere; 3: With ammonia; water in tetrahydrofuran; hexane