1: (S)-(tert-butyl)(methyl)phosphine-borane With n-butyllithium T=-80°C; Inert atmosphere; 2: 2,3-Dichloroquinoxaline T=-80 - 20°C; Inert atmosphere; 3: With N,N,N',N,-tetramethylethylenediamine T=20°C; Inert atmosphere;

1.1: n-butyllithium / tetrahydrofuran; hexane / -80 °C / Inert atmosphere 1.2: 2.25 h / -80 - 0 °C / Inert atmosphere 2.1: 1,4-diaza-bicyclo[2.2.2]octane / tetrahydrofuran / 1.5 h / Inert atmosphere; Reflux 3.1: sec.-butyllithium / tetrahydrofuran; hexane; cyclohexane / 0.5 h / -80 °C / Inert atmosphere 4.1: tetrahydrofuran; hexane; cyclohexane / 2 h / -80 - 20 °C / Inert atmosphere 5.1: tetrahydrofuran; hexane; cyclohexane / 1 h / 40 °C / Inert atmosphere View Scheme