1: 2,4-dimethoxypyrimidine With 2,2,6,6-tetramethyl-piperidine; n-butyllithium; FeBr2 in tetrahydrofuran; hexane T=0 - 20°C; 2 h; 2: pivalaldehyde in tetrahydrofuran; hexane T=20°C; 1 h;