1: 97 percent / anhydrous HF / 16 h / Ambient temperature 2: 90 percent / hydrazine monohydrate, KOH / bis-(2-hydroxy-ethyl) ether / 6 h / Heating 3: 70 percent / DDQ / toluene / 16 h / Heating View Scheme

1: 97 percent / anhydrous HF / 16 h / Ambient temperature 2: 90 percent / hydrazine monohydrate, KOH / bis-(2-hydroxy-ethyl) ether / 6 h / Heating 3: 70 percent / DDQ / toluene / 16 h / Heating 4: 100 percent / H2 / PtO2 / ethyl acetate / 0.17 h View Scheme