1.1: Et3N; CF3CH2OH / 72 h / 20 °C 1.2: 73 percent / Zn; NH4Cl / methanol / 10 h / 20 °C / sonication 2.1: 83 percent / PhI(OAc)2; KOH / 12 h / 20 °C 3.1: 96 percent / aq. AcOH / 8 h / 20 °C 4.1: 62 percent / TMSOTf; Et3N / CH2Cl2 / 1 h / 10 °C 5.1: 34 percent / MeOH / tetrahydrofuran; hexane / 48 h / 20 °C View Scheme