1: NaBH4 / methanol / Ambient temperature 2: (i) CuCl, NH2OH*HCl, MeOH, THF, (ii) /BRN= 1304820/, EtNH2, (iii) <Cu(NH3)4>SO4, acetone 3: MnO2 / CH2Cl2 4: NaOMe / methanol 5: Al-Hg / diethyl ether 6: aq. H2SO4 / dioxane / Heating View Scheme