hydrazine hydrate in ethanol 1.) 50 deg C, 3 h; 2.) reflux, 2 h;

1: 1.) oxalyl chloride / 1.) 1,2-dichloroethane, 5 deg C; 2.) RT, 30 min; 40-50 deg C, 45 min; 70 deg C, 15 min 2: 73 percent / 92percent NH2NH2*H2O / ethanol / 1.) 50 deg C, 3 h; 2.) reflux, 2 h View Scheme