boron trichloride in dichloromethane T=0°C; 0.5 h;

1: 87 percent / boron trichloride / CH2Cl2 / 0.5 h / 0 °C 2: 1.) 99percent hydrazine hydrate, 2.) KOH / 1.) digol, 120-140 deg C, 30 min, 2.) digol, 150 deg C, 2 h View Scheme