in N,N-dimethyl-formamide T=140 - 150°C; 12 h;

1: 68 percent / EtONa / ethanol / 1 h / 55 °C 2: 72 percent / aq. NaOH / ethanol / 18 h / 20 °C 3: 56 percent / dimethylformamide / 12 h / 140 - 150 °C View Scheme

1: 72 percent / dimethylformamide / 3 h / 100 °C 2: 68 percent / EtONa / ethanol / 1 h / 55 °C 3: 72 percent / aq. NaOH / ethanol / 18 h / 20 °C 4: 56 percent / dimethylformamide / 12 h / 140 - 150 °C View Scheme

1: 72 percent / aq. NaOH / ethanol / 18 h / 20 °C 2: 56 percent / dimethylformamide / 12 h / 140 - 150 °C View Scheme