potassium acetate in N,N-dimethyl-formamide T=105 - 110°C; 6 h;

1: 7.2 g / PPTS / dimethylformamide; benzene / Heating 2: 4.7 g / 2percent AcOH / dimethylformamide; methanol / Ambient temperature 3: 3.4 g / pyridine / Ambient temperature 4: 1.48 g / AcOK / dimethylformamide / Heating View Scheme

1: 3.4 g / pyridine / Ambient temperature 2: 1.48 g / AcOK / dimethylformamide / Heating View Scheme

1: 4.7 g / 2percent AcOH / dimethylformamide; methanol / Ambient temperature 2: 3.4 g / pyridine / Ambient temperature 3: 1.48 g / AcOK / dimethylformamide / Heating View Scheme

1: 7.5 g / K2CO3 / dimethylformamide; methanol / Ambient temperature 2: 7.2 g / PPTS / dimethylformamide; benzene / Heating 3: 4.7 g / 2percent AcOH / dimethylformamide; methanol / Ambient temperature 4: 3.4 g / pyridine / Ambient temperature 5: 1.48 g / AcOK / dimethylformamide / Heating View Scheme