1: With AlCl3, aluminium chloride in dichloromethane T=20°C; 12 h; 2: With hydrogenchloride; water in dichloromethane

1.1: magnesium / diethyl ether / 12 h / 20 °C 1.2: 0 °C 2.1: dipyridinium dichromate / N,N-dimethyl-formamide / 12 h / 20 °C 3.1: AlCl3, aluminium chloride / dichloromethane / 12 h / 20 °C View Scheme

1.1: diisopropylamine; n-butyllithium / hexane; tetrahydrofuran / 1 h / -78 - 0 °C 1.2: 1 h 2.1: magnesium / diethyl ether / 12 h / 20 °C 2.2: 0 °C 3.1: dipyridinium dichromate / N,N-dimethyl-formamide / 12 h / 20 °C 4.1: AlCl3, aluminium chloride / dichloromethane / 12 h / 20 °C View Scheme

1: dipyridinium dichromate / N,N-dimethyl-formamide / 12 h / 20 °C 2: AlCl3, aluminium chloride / dichloromethane / 12 h / 20 °C View Scheme

1.1: tetrahydrofuran / 6 h / Reflux 1.2: 20 h / 75 °C 2.1: boron tribromide / dichloromethane / 1 h / -78 - 23 °C View Scheme

potassium carbonate in acetone T=20 - 70°C;

1: pyridine / dichloromethane / 3 h / 45 °C / Cooling with ice 2: sodium hydride / dimethyl sulfoxide / 12 h / 100 °C 3: potassium carbonate / N,N-dimethyl-formamide / 12 h / 50 - 60 °C View Scheme

1: copper(ll) bromide / chloroform; ethyl acetate / 18 h / 60 °C 2: potassium carbonate / N,N-dimethyl-formamide / 1.5 h / 0 °C View Scheme