1: With potassium acetate in N,N-dimethyl-formamide 0.166667 h; 2: With dichloro(1,1'-bis(diphenylphosphanyl)ferrocene)palladium(II) dichloromethane adduct in N,N-dimethyl-formamide T=80°C;

1.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -90 °C 1.2: trimethylborate / tetrahydrofuran; hexane / 0.5 h / -70 °C 1.3: 50 percent / aq. ammonium chloride / tetrahydrofuran; hexane / 1 h / 20 °C 2.1: 72 percent / molecular sieves 4 Angstroem / tetrahydrofuran / 2 h / 20 °C View Scheme