1: triethylamine / diethyl ether / 0.5 h / 0 °C 2: triethylamine / diethyl ether / 12 h / Ambient temperature 3: acetonitrile / 30 h / 75 °C View Scheme

1: triethylamine / diethyl ether / 12 h / Ambient temperature 2: acetonitrile / 30 h / 75 °C View Scheme

in acetonitrile T=75°C; 30 h; Yield given;