1: acridine-4-carboxylic acid With (benzotriazol-1-yloxy)tris(Me2N)phosphonium(1+)*PF6(1-) in dichloromethane T=20°C; 2 h; 2: ethylenediamine in dichloromethane T=20°C; 3 h; Further stages.;

1.1: KOH; Al/Hg / aq. ethanol 2.1: (benzotriazol-1-yloxy)tris(Me2N)phosphonium(1+)*PF6(1-) / CH2Cl2 / 2 h / 20 °C 2.2: 56 percent / CH2Cl2 / 3 h / 20 °C View Scheme