1: 89 percent / tri-n-butylamine, 99 percent formic acid / bis(triphenylphosphine)palladium acetate / dimethylformamide / 2.5 h / 70 °C 2: 1.) K2CO3, MCPBA / 1.) CH2Cl2/toluene, -78 deg C, 2.) toluene, reflux, 7 h 3: 50 percent / PDC, 3 Angstroem molecular sieves, anh. acetic acid / CH2Cl2 / 2 h / Ambient temperature View Scheme

With  formic acid; tributyl-amine; bis(acetato)bis(triphenylphosphine)palladium(0) in  N,N-dimethyl-formamide T=70°C; 2.5 h;