Multi-step reaction with 5 steps 1.1: AlCl3, aluminium chloride / chlorobenzene / 3 h / 125 °C2.1: trichlorophosphate / 2 h / 125 °C3.1: lithium diisopropyl amide / tetrahydrofuran / 0.33 h / -78 °C3.2: 0.5 h / -78 °C4.1: manganese(IV) oxide / toluene / 2 h / |Reflux5.1: bis[(1S,2R,3S,5S)-pinan-3-yl]chloroborane / tetrahydrofuran / -55 - 20 °C