1: 84 percent / PdCl2(PPh3)2, Bu3SnH, HOAc / CH2Cl2 / 0.08 h / 23 °C 2: 70 percent / <N-methylpyridinium-4-carboxaldehyde>iodide, 1,8-diazabicyclo<6.4.0>undec-7-ene, DMF / CH2Cl2 / 0.67 h / 23 °C 3: 82 percent / silica gel / ethanol / 23 °C 4: aq. CF3COOH / tetrahydrofuran / 9 h / 23 °C 5: aq. AgNO3 / acetonitrile / 11 h / 23 °C View Scheme