Multi-step reaction with 10 steps 1: 1.) lithium diisopropyl amide / tetrahydrofuran / -78 °C2: toluene / 10 h / Heating3: 48percent aq. HF / 1.5 h / 0 °C4: diethyl ether / 0 °C5: LiAlH4 / diethyl ether / 3 h6: 91 percent / pyridine / CH2Cl2 / 0.5 h7: 91 percent / pyridine / 9 h / Ambient temperature8: 89 percent / Li, NH3 / tetrahydrofuran / 0.5 h / -78 °C / 1.) -78 deg C, 30 min. 2.) THF, 30 min9: 100 percent / 48percent aq. HF / acetonitrile / 1 h10: 1.) oxalyl chloride, DMSO, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 30 min., 2.) CH2Cl2, -78 deg C to room temp.