1.1: 1,3,5-trimethyl-benzene / 48 h / 190 °C / |Inert atmosphere 2.1: borane-THF / tetrahydrofuran / 15 h / 20 °C 2.2: 1.75 h / 20 °C 3.1: di-isopropyl azodicarboxylate; triphenylphosphine / tetrahydrofuran / 15 h / 0 °C / |Inert atmosphere View Scheme

1.1: sodium hydride / N,N-dimethyl-formamide / 0.5 h / |Cooling with ice 1.2: 15.75 h / 20 °C 2.1: 1,3,5-trimethyl-benzene / 48 h / 190 °C / |Inert atmosphere 3.1: borane-THF / tetrahydrofuran / 15 h / 20 °C 3.2: 1.75 h / 20 °C 4.1: di-isopropyl azodicarboxylate; triphenylphosphine / tetrahydrofuran / 15 h / 0 °C / |Inert atmosphere View Scheme