1: 96 percent / conc. sulfuric acid / methanol / 96 h / Ambient temperature 2: 77 percent / Heating View Scheme

With  triethylamine in  dichloromethane  0 deg C, 1 h -> room temperature, 1 h;   

Multi-step reaction with 3 steps 1: 96 percent / lead tetraacetate / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h2: ethyltributylammonium borohydride / CH2Cl2; 1,2-dichloro-ethane / Ambient temperature3: 87 percent / triethylamine / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h  

Multi-step reaction with 2 steps 1: ethyltributylammonium borohydride / CH2Cl2; 1,2-dichloro-ethane / Ambient temperature2: 87 percent / triethylamine / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h  

Multi-step reaction with 4 steps 1: 75 percent / aq. HCOOH2: 96 percent / lead tetraacetate / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h3: ethyltributylammonium borohydride / CH2Cl2; 1,2-dichloro-ethane / Ambient temperature4: 87 percent / triethylamine / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h  

With  sulfuric acid in  methanol 96 h;  Ambient temperature;