1: Na/NH3 2: 60percent aq. AcOH 3: pyridine 4: 1.) MeSCH2S(O)Me, 2.) BuLi, 3.) H2SO4 5: C5H5NHBr3, pyridine / CH2Cl2 6: LiCl, Li2CO3, HMPA 7: EtONa / benzene 8: p-TsN3, triethylamine / diethyl ether 9: Irradiation 10: 100 percent / 5percent aq. NaOH / methanol / 6 h / 12 °C 11: triethylamine, (PhO)2P(O)N3 / benzene / 20 h / Heating 12: 18 h / Heating 13: 1.) NaHCO3, Me2SO4, 2.) NaOH / 1.) MeOH, 35 deg C, 40 h, 2.) MeOH, H2O, 40 deg C, 2 h View Scheme