1: 89 percent / NH2OH+HCl, pyridine / 1 h / 60 °C 2: 86 percent / TFA / 4 h / Heating 3: 94 percent / HCl / ethanol / 4 h / Heating 4: 90 percent / 0.13 h / Heating 5: 87 percent / diborane / tetrahydrofuran / 1 h / Heating 6: 45 percent / POCl3 / 0.5 h / Heating View Scheme

aluminium trichloride in dichloromethane T=0°C; 24 h;

aluminium trichloride in carbon disulfide 5 h; Heating;

aluminium trichloride in dichloromethane T=0°C; 24 h; various ratio of AlCl3 and CH3COCl; Product distribution;