1: diethylamine / tetrahydrofuran 2: DIBAL / toluene / -78 °C 3: pyridine / 0 °C 4: 78 percent / trimethylsilyl triflate / 1,2-dichloro-ethane 5: 10percent H2O2 / pyridine / CH2Cl2 6: n-Bu4NF / tetrahydrofuran View Scheme

1: diethylamine / tetrahydrofuran 2: DIBAL / toluene / -78 °C 3: pyridine / 0 °C 4: 78 percent / trimethylsilyl triflate / 1,2-dichloro-ethane 5: n-Bu3SnH, Et3B / benzene / Ambient temperature 6: n-Bu4NF / tetrahydrofuran View Scheme

Multi-step reaction with 5 steps 1: diethylamine / tetrahydrofuran2: DIBAL / toluene / -78 °C3: pyridine / 0 °C4: 78 percent / trimethylsilyl triflate / 1,2-dichloro-ethane5: 10percent H2O2 / pyridine / CH2Cl2  

Multi-step reaction with 2 steps 1: 1) lithium hexamethyldisilazide / 1) THF, -78 deg C, 1h, 2) room temperature, 30 min2: tetrahydrofuran / -78 °C  

With  diethylamine in  tetrahydrofuran