1: 2-quinoxaline-carboxylic acid With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride in tetrahydrofuran T=0 - 20°C; 1 h; Inert atmosphere; 2: benzylamine in tetrahydrofuran T=20°C; 5 h; Inert atmosphere;

triethylamine in benzene 3 h; Ambient temperature;