1: With N-bromosuccinmide in tetrachloromethane 2 h; UV-irradiationreflux; 2: With potassium hydroxide in methanol; water 1 h; Heating;

1.1: 87 percent / triethylamine / toluene / 3.25 h 2.1: N-bromosuccinimide / CCl4 / 2 h / UV-irradiation; reflux 2.2: 50 percent / potassium hydroxide / methanol; H2O / 1 h / Heating View Scheme

1.1: 92 percent / hydrogen / Raney nickel / methanol / 9.5 h 2.1: hydrochloric acid / tetrahydrofuran / 1 h / Heating 2.2: 96 percent / hydrazine hydrate / methanol / 1 h / Heating View Scheme