1: 75 percent / (C2H5)3N / 0.5 h / 75 °C 2: 71 percent / triphenylphosphine, diethyl diazenedicarboxylate / tetrahydrofuran / 48 h / Ambient temperature 3: 1.) hydrazine hydrate, 2.) conc. HCl / 1.) MeOH, overnight, room temp.; 2 h, reflux, 2.) 6 h, reflux View Scheme

1: 71 percent / triphenylphosphine, diethyl diazenedicarboxylate / tetrahydrofuran / 48 h / Ambient temperature 2: 1.) hydrazine hydrate, 2.) conc. HCl / 1.) MeOH, overnight, room temp.; 2 h, reflux, 2.) 6 h, reflux View Scheme

hydrogenchloride; hydrazine hydrate 1.) MeOH, overnight, room temp.; 2 h, reflux, 2.) 6 h, reflux; Multistep reaction;