1: 84 percent / Pd(PPh3)4; diethylaniline, pyridine / tetrahydrofuran / 4 h 2: 95 percent / p-aminothiophenol, cesium carbonate / dimethylformamide / 1 h / 85 °C 3: 92 percent / Pd(dppp)Cl2, lithium triethylborohydride / tetrahydrofuran / 3 h / 0 °C 4: 78 percent / ceric ammoniumnitrate / acetonitrile; H2O; CH2Cl2 View Scheme