1: 41 percent / 2,3-dicyano-5,6-dichloroquinone / dioxane / 12 h / Heating 2: 96 percent / H2 / Pd/C / methanol 3: 15 percent / dicyclohexylcarbodiimide, meta-chloroperoxybenzoic acid 4: toluene / Heating; Otera's catalyst 5: 96 percent / H2 / Pd/C / methanol View Scheme