1: 75 percent / aq. HCOOH 2: 96 percent / lead tetraacetate / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h 3: ethyltributylammonium borohydride / CH2Cl2; 1,2-dichloro-ethane / Ambient temperature 4: 87 percent / triethylamine / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h 5: 96 percent / conc. sulfuric acid / methanol / 96 h / Ambient temperature 6: 77 percent / Heating View Scheme

With  formic acid  

Multi-step reaction with 2 steps 1: 75 percent / aq. HCOOH2: 96 percent / lead tetraacetate / CH2Cl2 / 0 deg C, 1 h -> room temperature, 1 h  

Multi-step reaction with 3 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 temperature  

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  

Multi-step reaction with 5 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 h5: 770 mg / 96 h / Heating  

Multi-step reaction with 5 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 h5: 96 percent / conc. sulfuric acid / methanol / 96 h / Ambient temperature