1: 59 percent / KOH, H2O / 3.5 h / Heating 2: 85 percent / 2.5 h / 55 °C 3: NaBH4 / tetrahydrofuran; methanol / 1 h / 0 °C 4: p-TsOH / benzene / 16 h / Ambient temperature 5: 94 percent / DDQ / benzene / Ambient temperature View Scheme

Multi-step reaction with 2 steps 1: 59 percent / KOH, H2O / 3.5 h / Heating2: 85 percent / 2.5 h / 55 °C  

Multi-step reaction with 4 steps 1: 59 percent / KOH, H2O / 3.5 h / Heating2: 85 percent / 2.5 h / 55 °C3: NaBH4 / tetrahydrofuran; methanol / 1 h / 0 °C4: p-TsOH / benzene / 16 h / Ambient temperature  

With  potassium hydroxide; water 3.5 h;  Heating;   

Multi-step reaction with 3 steps 1: 59 percent / KOH, H2O / 3.5 h / Heating2: 85 percent / 2.5 h / 55 °C3: NaBH4 / tetrahydrofuran; methanol / 1 h / 0 °C