1: diethyl acetone-1,3-dicarboxylate With lithium diisopropyl amide in tetrahydrofuran; hexane T=-18°C; 0.166667 h; 2: iso-butyl iodide in tetrahydrofuran; hexane T=-18 - 20°C; 4.5 h; Further stages.;

magnesium diethoxide 1.) EtOH, reflux, 90 min, 2.) EtOH, reflux, 16 h; Yield given. Multistep reaction;