ammonia; acetic anhydride; caesium carbonate; triethylamine in N,N-dimethyl-formamide

benzaldehyde; triethylamine in N,N-dimethyl-formamide

caesium carbonate in N,N-dimethyl-formamide T=90°C; 2 h;

1: 1,4-diacetyl-piperazine-2,5-dione; 4-methoxy-benzaldehyde With potassium tert-butylate in N,N-dimethyl-formamide; tert-butyl alcohol T=25°C; Condensation; 24 h; 2: benzaldehyde With potassium tert-butylate in N,N-dimethyl-formamide; tert-butyl alcohol T=25°C; Condensation; 24 h;

potassium fluoride on basic alumina Irradiation;

1: 69 percent / t-BuOK / tetrahydrofuran; 2-methyl-propan-2-ol 2: 67 percent / Cs2CO3 / dimethylformamide / 2 h / 90 °C View Scheme

1: 94 percent / KF-Al2O3 / Irradiation 2: 78 percent / KF-Al2O3 / Irradiation View Scheme