1: pyridine / dichloromethane / 1 h / 0 °C 2: potassium carbonate; N-benzyl-N,N,N-triethylammonium chloride / N,N-dimethyl-formamide / 12 h / 80 °C 3: N-methyl-acetamide; N-bromosuccinmide / chloroform / 18 h / 30 °C / |Reflux View Scheme

1: lithium tert-butylate / N,N-dimethyl-formamide; tetrahydrofuran / 44 h / 20 °C / |Cooling with ice 2: N-methyl-acetamide; N-bromosuccinmide / chloroform / 18 h / 30 °C / |Reflux View Scheme