1: 67 percent / CuCl 2: 92 percent / POCl3, H2O / dimethylformamide / Vilsmeier reaction 3: ethanol / 1 h / Ambient temperature 4: sodium borohydride / Heating 5: 51 percent / CuCl 6: 89 percent / POCl3, H2O / dimethylformamide / Vilsmeier reaction View Scheme

1: 67 percent / CuCl 2: 92 percent / POCl3, H2O / dimethylformamide / Vilsmeier reaction View Scheme

Multi-step reaction with 3 steps 1: 67 percent / CuCl2: 92 percent / POCl3, H2O / dimethylformamide / Vilsmeier reaction3: ethanol / 1 h / Ambient temperature  

Multi-step reaction with 5 steps 1: 67 percent / CuCl2: 92 percent / POCl3, H2O / dimethylformamide / Vilsmeier reaction3: ethanol / 1 h / Ambient temperature4: sodium borohydride / Heating5: 51 percent / CuCl