1: 71 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating 2: 75 percent / aluminium chloride, sodium chloride / 0.08 h / 180 - 190 °C View Scheme

Multi-step reaction with 6 steps 1: 90 percent / t-butyl hydroperoxide / VO(acac)2 / 4 h / Ambient temperature2: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature3: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature4: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C5: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating6: 85 percent / diethyl ether / 1 h / Ambient temperature  

Multi-step reaction with 4 steps 1: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature2: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C3: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating4: 85 percent / diethyl ether / 1 h / Ambient temperature  

Multi-step reaction with 5 steps 1: 83 percent / LAH / tetrahydrofuran / 4 h / Ambient temperature2: 69 percent / p-toluenesulphonic acid / acetonitrile / 0.5 h / 0 deg C to room temperature3: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C4: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating5: 85 percent / diethyl ether / 1 h / Ambient temperature  

Multi-step reaction with 2 steps 1: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating2: 85 percent / diethyl ether / 1 h / Ambient temperature  

Multi-step reaction with 3 steps 1: 86 percent / aluminium chloride, LAH / diethyl ether / 1 h / 5 °C2: 67.1 percent / pyridinium dichromate / CH2Cl2; acetic anhydride / 2 h / Heating3: 85 percent / diethyl ether / 1 h / Ambient temperature  

With  dipyridinium dichromate in  dichloromethane; acetic anhydride 2 h;  Heating;