1.1: pyridine; potassium hydroxide / 3 h / 70 °C 1.2: Cooling with ice 2.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 3.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 3.2: 0.5 h / 20 °C / Inert atmosphere 4.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme