lithium diisopropyl amide 1.) THF, hexane, -78 deg C, 10 min, 2.) THF, hexane, -40 deg C to RT, 2 h; Yield given. Multistep reaction;

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