MgBr2(Et2O) in dichloromethane T=20°C; Lindsey's method; 0.25 h;

triethylamine in dichloromethane T=20°C; 0.25 h; Inert atmosphere;

1: indium(III) chloride / 1.5 h / 20 °C / |Inert atmosphere 2: ethylmagnesium bromide / tetrahydrofuran / 4 h / -78 - 20 °C / |Inert atmosphere 3: 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 2 h / 115 °C / |Microwave irradiation View Scheme

1,8-diazabicyclo[5.4.0]undec-7-ene in toluene T=115°C; 2 h; Microwave irradiation;

1: ethylmagnesium bromide / tetrahydrofuran / 4 h / -78 - 20 °C / |Inert atmosphere 2: 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 2 h / 115 °C / |Microwave irradiation View Scheme