1.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 2.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 2.2: 0.5 h / 20 °C / Inert atmosphere 3.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

1.1: potassium hydroxide / ethanol; water / 24 h / Reflux 2.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 2 h / 0 °C 3.1: pyridine / 15 h / 20 °C / Inert atmosphere 4.1: pyridine; potassium hydroxide / 3 h / 70 °C 4.2: Cooling with ice 5.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 6.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 6.2: 0.5 h / 20 °C / Inert atmosphere 7.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

sodium methylate

2: sodium methoxide View Scheme