1: 5-bromo-3-pyridinecarboxaldehyde With tetrakis(triphenylphosphine) palladium(0) in 1,2-dichloro-ethane T=20°C; 0.0833333 h; 2: thiophen-3-yl boronic acid in 1,2-dichloro-ethane 0.166667 h; 3: With sodium carbonate in water; 1,2-dichloro-ethane 12 h; Heating / reflux;

1: 29 percent / BH3*THF / tetrahydrofuran / 4 h / Heating 2: 61 percent / Pd(PPh3)4; aq. Na2CO3 / toluene; methanol / 20 h / 70 °C 3: 52 percent / PCC; AcONa / CH2Cl2 / 2 h / 20 °C View Scheme

1: 61 percent / Pd(PPh3)4; aq. Na2CO3 / toluene; methanol / 20 h / 70 °C 2: 52 percent / PCC; AcONa / CH2Cl2 / 2 h / 20 °C View Scheme