1: hydrazine hydrate / Raney nickel / aq. ethanol / 5 h / Heating 2: CHCl3 / 24 h / Ambient temperature 3: Et3N / benzene / 6 h / Heating View Scheme

1: CHCl3 / 24 h / Ambient temperature 2: Et3N / benzene / 6 h / Heating View Scheme

triethylamine in benzene 6 h; Heating;