1: Et3N / benzene / Heating 2: BF3OEt2 / benzene / Heating 3: 95 percent / benzene / Heating 4: 98 percent 5: 41 percent / 2,3-dicyano-5,6-dichloroquinone / dioxane / 12 h / Heating 6: 96 percent / H2 / Pd/C / methanol 7: 15 percent / dicyclohexylcarbodiimide, meta-chloroperoxybenzoic acid 8: toluene / Heating; Otera's catalyst 9: 96 percent / H2 / Pd/C / methanol View Scheme