1: 56 percent / Cs2CO3 / dimethylformamide / 3 h / 23 °C 2: TFA / CH2Cl2 / 4 h / 23 °C 3: 87 percent / CH2Cl2 / 1 h / 23 °C 4: 82 percent / HCl / dioxane / 1 h / 23 °C 5: 98 percent / pyridine / CH2Cl2 / 1 h / 0 °C 6: 88 percent / diisopropylethylamine; dimethylaminopyridine / acetonitrile / 6 h / 40 °C 7: 83 percent / Zn; AcOH / H2O / 7 h / 23 °C 8: 50 percent / NaNO2; AcOH / tetrahydrofuran; H2O / 3 h / 0 °C 9: 95 percent / EDC*HCl; DMAP / CH2Cl2 / 3 h / 23 °C 10: 90 percent / Bu3SnH; AcOH / (PPh3)2PdCl2 / CH2Cl2 / 0.25 h / 23 °C 11: 91 percent / benzeneseleninic anhydride / CH2Cl2 / 0.08 h / -10 °C 12: 58 percent View Scheme