sulfuric acid

1: BF3 3: 52 percent / concd HCl, CaCl2 / 0 °C 4: Bu3SnH, AIBN / 80 °C View Scheme

4-(N,N-dimethlyamino)pyridine; N'-(3-dimethylaminopropyl)-N-ethylcarbodiimide in dichloromethane T=0 - 20°C;

1: oxalyl chloride; DMF / benzene / 1 h / 20 °C 2: 278 mg / benzyl(chloro)-bis(triphenylphosphine)palladium(II) / hexamethylphosphoric acid triamide / 0.75 h / 65 °C View Scheme