1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / -5 °C 2: copper(l) iodide; tetrabutylammomium bromide; palladium dichloride / dimethyl sulfoxide; N,N-dimethyl-formamide / 3 h / 120 °C / Inert atmosphere 3: pyridine hydrochloride / 1 h / 180 °C / Neat (no solvent); Inert atmosphere View Scheme

1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / -5 °C 2: copper(l) iodide; tetrabutylammomium bromide; palladium dichloride / dimethyl sulfoxide; N,N-dimethyl-formamide / 3 h / 120 °C / Inert atmosphere View Scheme

1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / -5 °C 2: copper(l) iodide; tetrabutylammomium bromide; palladium dichloride / dimethyl sulfoxide; N,N-dimethyl-formamide / 3 h / 120 °C / Inert atmosphere 3: pyridine hydrochloride / 1 h / 180 °C / Neat (no solvent); Inert atmosphere 4: potassium carbonate / methanol; water / 0.33 h / Inert atmosphere View Scheme

1: in dichloromethane T=20°C; 1 h; Inert atmosphere; 2: With pyridine in dichloromethane T=20°C; Inert atmosphere;

1,8-diazabicyclo[5.4.0]undec-7-ene in dichloromethane T=-5°C;