triphenylphosphine; diethylazodicarboxylate in tetrahydrofuran 1.5 h; 0 deg C to RT;

Multi-step reaction with 9 steps 1: p-TsOH / H2O; tetrahydrofuran / 0.17 h / Heating2: LiAlH4 / tetrahydrofuran / 2.5 h / -90 to -20 deg C3: 90 percent / PPh3Br2, pyridine / acetonitrile / 1 h / -7 to RT4: 100 percent / acetonitrile / 48 h / Heating5: 86 percent / NaN(SiMe3)2 / tetrahydrofuran / 12 h / -100 deg C to RT6: 93 percent / DIBAH / CH2Cl2 / 1 h / -90 °C7: 81 percent / EtAlCl2 / diethyl ether; hexane / 2.5 h / -40 to -20 deg C8: 77 percent / 40percent aq. HF / acetonitrile / 12 h / 0 deg C to RT9: 70 percent / Bu4NF / tetrahydrofuran / 0.25 h / -90 °C