10 palladium on activated charcoal; hydrogen in tetrahydrofuran; methanol T=20°C; 1.5 h;

1: 2 g / silver carbonate / pyridine / 3 h / Ambient temperature; exclusion of light 3: sodium methoxide View Scheme

1: 2 g / silver carbonate, phenol / pyridine / 3 h / Ambient temperature; exclusion of light 2: 2 g / silver carbonate / pyridine / 3 h / Ambient temperature; exclusion of light 4: sodium methoxide View Scheme

1.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 1.2: 0.5 h / 20 °C / Inert atmosphere 2.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

1.1: pyridine / 15 h / 20 °C / Inert atmosphere 2.1: pyridine; potassium hydroxide / 3 h / 70 °C 2.2: Cooling with ice 3.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 4.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 4.2: 0.5 h / 20 °C / Inert atmosphere 5.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

1.1: sodium acetate / 1 h / 110 °C 2.1: boron trifluoride diethyl etherate; acetic acid / 5 h / 80 °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

1.1: pyridine / 15 h / 20 °C / Inert atmosphere 2.1: pyridine; potassium hydroxide / 3 h / 70 °C 2.2: Cooling with ice 3.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 4.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 4.2: 0.5 h / 20 °C / Inert atmosphere 5.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

1.1: oxalyl dichloride; N,N-dimethyl-formamide / dichloromethane / 2 h / 0 °C 2.1: pyridine / 15 h / 20 °C / Inert atmosphere 3.1: pyridine; potassium hydroxide / 3 h / 70 °C 3.2: Cooling with ice 4.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 5.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 5.2: 0.5 h / 20 °C / Inert atmosphere 6.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

1.1: boron trifluoride diethyl etherate; acetic acid / 5 h / 80 °C 2.1: pyridine / 15 h / 20 °C / Inert atmosphere 3.1: pyridine; potassium hydroxide / 3 h / 70 °C 3.2: Cooling with ice 4.1: sulfuric acid; acetic acid / 1.5 h / 80 °C 5.1: boron tribromide / dichloromethane / 1.5 h / 0 °C / Inert atmosphere 5.2: 0.5 h / 20 °C / Inert atmosphere 6.1: 10 palladium on activated charcoal; hydrogen / tetrahydrofuran; methanol / 1.5 h / 20 °C View Scheme

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