1.1: bis(dibenzylideneacetone)-palladium(0); Pd0(tris(tert-butyl)phosphine)2 / toluene / 2 h / 100 °C / Inert atmosphere 2.1: hydrogenchloride; water / toluene; diethyl ether 2.2: pH 10 View Scheme

1.1: bis(dibenzylideneacetone)-palladium(0); Pd0(tris(tert-butyl)phosphine)2 / toluene / 2 h / 100 °C / Inert atmosphere 2.1: hydrogenchloride; water / toluene; diethyl ether 2.2: pH 10 3.1: triethylamine / dichloromethane / 0.5 h / 10 °C / Inert atmosphere 4.1: AlCl3, aluminium chloride / dichloromethane / 0 - 10 °C 5.1: sodium hydroxide / tetrahydrofuran / 3 h / 20 °C View Scheme

triethylamine; p-toluenesulfonyl chloride in benzene Inert atmosphereReflux;

1.1: trifluoroacetic acid / 20 h / 0 - 60 °C 1.2: 1 h / 20 °C 2.1: potassium carbonate / N,N-dimethyl-formamide / 2 h / 20 °C / Inert atmosphere 3.1: sodium hydroxide / methanol / 0.5 h / Reflux 4.1: triethylamine; p-toluenesulfonyl chloride / benzene / Inert atmosphere; Reflux View Scheme

1: potassium carbonate / N,N-dimethyl-formamide / 2 h / 20 °C / Inert atmosphere 2: sodium hydroxide / methanol / 0.5 h / Reflux 3: triethylamine; p-toluenesulfonyl chloride / benzene / Inert atmosphere; Reflux View Scheme

1: sodium hydroxide / methanol / 0.5 h / Reflux 2: triethylamine; p-toluenesulfonyl chloride / benzene / Inert atmosphere; Reflux View Scheme

1: potassium carbonate / N,N-dimethyl-formamide / 2 h / 20 °C / Inert atmosphere 2: sodium hydroxide / methanol / 0.5 h / Reflux 3: triethylamine; p-toluenesulfonyl chloride / benzene / Inert atmosphere; Reflux View Scheme