1: 90 percent / Zn-amalgam, 4 N aq. HCl / dioxane / 2 h / Heating 2: H2 / 10percent Pd/C / ethyl acetate / 0.25 h / Ambient temperature 3: pyridine / 2 h / Heating 4: 68 percent / CrO3, water / acetic acid / 4 h / Ambient temperature 5: aq. KOH / 4 h / Heating View Scheme

With  trichlorophosphate in  dichloromethane  Ambient temperature;   

Multi-step reaction with 2 steps 1: 74 percent / K2CO3 / dimethylformamide / 1 h / Heating2: 88 percent / POCl3 / CH2Cl2 / Ambient temperature  

With  hydrogenchloride; mercury; zinc in  1,4-dioxane 2 h;  Heating;   

Multi-step reaction with 2 steps 1: 90 percent / Zn-amalgam, 4 N aq. HCl / dioxane / 2 h / Heating2: H2 / 10percent Pd/C / ethyl acetate / 0.25 h / Ambient temperature  

Multi-step reaction with 3 steps 1: 90 percent / Zn-amalgam, 4 N aq. HCl / dioxane / 2 h / Heating2: H2 / 10percent Pd/C / ethyl acetate / 0.25 h / Ambient temperature3: pyridine / 2 h / Heating  

Multi-step reaction with 4 steps 1: 90 percent / Zn-amalgam, 4 N aq. HCl / dioxane / 2 h / Heating2: H2 / 10percent Pd/C / ethyl acetate / 0.25 h / Ambient temperature3: pyridine / 2 h / Heating4: 68 percent / CrO3, water / acetic acid / 4 h / Ambient temperature