1: 99 percent / KH / tetrahydrofuran; various solvent(s) / 1 h / 20 °C 2: 94 percent / LDA / tetrahydrofuran; hexane / 0.25 h / -78 °C 3: 98 percent / H2 / Pd/C / ethyl acetate / 1 h / 20 °C 4: 95 percent / EDC; HOBT / CH2Cl2 / 17 h / 0 - 20 °C 5: TBAF / tetrahydrofuran / 0.33 h / 20 °C 6: aq. cerium ammonium nitrate / acetonitrile / 0.08 h / 20 °C View Scheme