1: NaOMe / methanol 2: 78 percent / N-bromosuccinimide; water / tetrahydrofuran / 24 h / 20 °C 3: 40 percent 4: 81 percent / t-BuOK / tetrahydrofuran / 24 h / 20 °C 5: 78 percent / 10percent Pd/C / methanol / 20 °C 6: 97 percent / 15 h / Heating View Scheme

sodium methylate in methanol Dehydrobromination;