1: 69 percent / ethanol / 1.75 h / Heating 2: 78 percent / cuprous bromide, sodium carbonate / various solvent(s) / 8 h / 200 °C 3: 41 percent / KOH, water / ethanol / 23 h / Heating 4: NaCO3, KI / dimethylformamide / 4 h / 65 °C 5: NaBH4 / ethanol; tetrahydrofuran / 0.5 h View Scheme

1: 69 percent / ethanol / 1.75 h / Heating 2: 78 percent / cuprous bromide, sodium carbonate / various solvent(s) / 8 h / 200 °C 3: 41 percent / KOH, water / ethanol / 23 h / Heating 4: NaCO3, KI / dimethylformamide / 4 h / 65 °C 5: NaBH4 / ethanol; tetrahydrofuran / 0.5 h View Scheme

1: 78 percent / cuprous bromide, sodium carbonate / various solvent(s) / 8 h / 200 °C 2: 41 percent / KOH, water / ethanol / 23 h / Heating 3: NaCO3, KI / dimethylformamide / 4 h / 65 °C 4: NaBH4 / ethanol; tetrahydrofuran / 0.5 h View Scheme

1: NaCO3, KI / dimethylformamide / 4 h / 65 °C 2: NaBH4 / ethanol; tetrahydrofuran / 0.5 h View Scheme

1: 41 percent / KOH, water / ethanol / 23 h / Heating 2: NaCO3, KI / dimethylformamide / 4 h / 65 °C 3: NaBH4 / ethanol; tetrahydrofuran / 0.5 h View Scheme

sodium tetrahydroborate in tetrahydrofuran; ethanol 0.5 h;