in toluene 8 h; Heating;

in toluene Heating;

1: formaldehyd; N-butylamine With hydrogenchloride in methanol; water T=10°C; Modified Radziszewski reaction; 0.5 h; 2: ethane-1,2-dial in methanol; water T=20°C; Modified Radziszewski reaction; 6 h;