hydrogenchloride 1 h; Heating;

Multi-step reaction with 4 steps 1: acetic acid, sodium acetate / H2O2: Zn, acetic acid3: cc. HCl / dimethylformamide4: 2 M HCl / Heating  

Multi-step reaction with 3 steps 1: Zn, acetic acid2: cc. HCl / dimethylformamide3: 2 M HCl / Heating  

Multi-step reaction with 4 steps 1: 88 percent / Et3N / butan-1-ol / 24 h / Heating2: NaOAc, AcOH / H2O / Ambient temperature3: 74.5 percent / Zn, NH4Cl / tetrahydrofuran; methanol / 0.5 h4: 1.) concd aq. HCl, 2.) 0.6 N aq. HCl / 1.) DMF, 3.5 h, 2.) rt, 30 min  

Multi-step reaction with 2 steps 1: cc. HCl / dimethylformamide2: 2 M HCl / Heating