1: 84 percent / NaH / dimethylformamide; CH2Cl2 / Ambient temperature 2: 45 percent / water, NaOH / pyridine; methanol / 24 h / Heating View Scheme

1: 84 percent / NaH / dimethylformamide; CH2Cl2 / Ambient temperature 2: 45 percent / water, NaOH / pyridine; methanol / 24 h / Heating 3: 50 percent / BBr3, NaHCO3 / CH2Cl2 / 24 h / -35 °C View Scheme

sodium hydride in dichloromethane; N,N-dimethyl-formamide Ambient temperature;