sodium hydride in N,N-dimethyl-formamide T=60°C; 5 h;

1: acetonitrile / 2 h / 120 °C 2: various solvent(s) / 0.42 h / 220 - 230 °C 3: NaH / dimethylformamide / 5 h / 60 °C View Scheme

1: SOCl2 / toluene; dimethylformamide / 2 h / 130 °C 2: acetonitrile / 2 h / 120 °C 3: various solvent(s) / 0.42 h / 220 - 230 °C 4: NaH / dimethylformamide / 5 h / 60 °C View Scheme

1: various solvent(s) / 0.42 h / 220 - 230 °C 2: NaH / dimethylformamide / 5 h / 60 °C View Scheme

1: various solvent(s) / 1 h / 130 °C 2: SOCl2 / toluene; dimethylformamide / 2 h / 130 °C 3: acetonitrile / 2 h / 120 °C 4: various solvent(s) / 0.42 h / 220 - 230 °C 5: NaH / dimethylformamide / 5 h / 60 °C View Scheme