1: H2NCSNH2, NaHCO3 / ethanol / Heating 2: 91 percent / DIPEA / CH2Cl2 3: 100 percent / diisobutylaluminium hydride / tetrahydrofuran / -78 °C 4: 80 percent / toluene 5: 60 percent / PCC, p-TsOH / CH2Cl2 6: 87 percent / tetrahydrofuran / -78 °C 7: 63 percent / K-Selectride / tetrahydrofuran / -78 °C 8: 85 percent / DIPEA / CH2Cl2 9: 1.) aq. HCl, 2.) LiOH 10: 80 percent / 2,4,6-trichlorobenzoyl chloride, DMAP / toluene / Heating 11: 80 percent / TiCl4 / CH2Cl2 / 0 °C View Scheme