1: 64 percent / KOH / ethanol 2: K2CO3 / H2O 3: K2CO3 / acetone 4: 98 percent / Dess-Martin reagent / CH2Cl2 5: 81 percent / BF3*OEt2 / CH2Cl2 6: LiBH4 / tetrahydrofuran / Heating 7: NaOMe View Scheme