1: 1.) sodium tert-butoxide / 1.) THF, 15 min, 2.) THF, 30 min 2: trifluoroacetic acid / 1 h / Ambient temperature 3: 2M aq. NaOH / tetrahydrofuran / 0.25 h / Ambient temperature 4: 74 percent / 1M Dibal / hexane; CH2Cl2 / 1 h / Ambient temperature 5: 41 percent / triphenylphosphine, diethyl azodiacrboxylate / tetrahydrofuran 6: 1.) hydrazine hydrate, 2.) 18percent aq.HCl / 1.) methanol, reflux, 3 h, 2.) methanol, reflux, 30 min View Scheme

1: t-BuONa 2: CF3CO2H 3: NaOH 4: diisobutylaluminium hydride (DIBAL) / hexane 5: PBr3 7: NH2NH2 View Scheme