1: 72 percent / Bu3SnH / AIBN / toluene / 0.5 h / Heating 2: 82 percent / 2-(di-tert-butylphosphino)biphenyl / Pd2(dba)3 / toluene / 24 h / 110 °C 3: TFA / CH2Cl2 / 1 h / 0 - 20 °C 4: K2CO3 / acetone / 12 h / 20 °C 5: 72 percent / H2 / 10percent Pd/C / methanol; ethyl acetate / 7 h / 20 °C View Scheme