1: 54 percent / tetrahydrofuran 2: 81 percent / NaIO4 / diethyl ether; H2O View Scheme

With  potassium dioxotetrahydroxoosmate(VI); potassium carbonate; 1,4-bis(9-O-dihydroquinidine)phthalazine; potassium hexacyanoferrate(III) in  water; tert-butyl alcohol  

Multi-step reaction with 3 steps 1: 87 percent / pyridine / 1) 0 to 5 deg C, 5.5 h; 2) 8 deg C, 12 h.2: 76 percent / p-toluenesulfonic acid / benzene / 4 h / Heating3: 78 percent / Li2CuCl4 / diethyl ether; tetrahydrofuran / 1) -70 deg C, 2h; 2) room temp., 12 h.