triethylamine; magnesium chloride in acetonitrile 120 h; Heating / reflux;

1.1: potassium carbonate / N,N-dimethyl-formamide / 1 h / 20 °C 2.1: n-butyllithium / cyclohexane; tetrahydrofuran / 1.25 h / -60 °C / Inert atmosphere 2.2: 0.5 h / 20 °C 3.1: hydrogenchloride; water / cyclohexane; tetrahydrofuran / 15 h / 60 °C View Scheme

1.1: n-butyllithium / cyclohexane; tetrahydrofuran / 1.25 h / -60 °C / Inert atmosphere 1.2: 0.5 h / 20 °C 2.1: hydrogenchloride; water / cyclohexane; tetrahydrofuran / 15 h / 60 °C View Scheme

N-bromosuccinmide in dichloromethane T=20°C; 0.5 h;