potassium tert-butylate in tetrahydrofuran T=20°C; 2 h;

1: 6,9-diphenyl-5H-1,5,7,8-tetraaza-benzocycloheptene With potassium tert-butylate in tetrahydrofuran T=20°C; 2: methyl iodide in tetrahydrofuran T=20°C;

hydrogenchloride T=100°C; 2 h;