potassium tert-butylate in N,N-dimethyl-formamide T=20°C; 1 h;

1: potassium tert-butoxide / dimethylformamide / 3 h 2: 1.) acetic acid, 2.) 60 percent aq. H2SO4 / 1.) 100 deg C, 2.) 110 deg C, 6 h 3: 88 percent / N-methylpyrrolidone / 1 h / 100 °C View Scheme