thionyl chloride; N,N-dimethyl-formamide T=25°C;

Multi-step reaction with 3 steps 1: 99 percent / N,N,N',N'-tetramethylethylenediamine; s-BuLi / cyclohexane; tetrahydrofuran / -78 - 25 °C2: 82 percent / HCl; acetic acid / H2O / 20 h / Heating3: 88 percent / HCl / H2O / 12 h / 25 °C  

Multi-step reaction with 2 steps 2: hydrogen / 5 percent palladium on charcoal / acetic acid / 80 °C