1: 1,2-dibromo-propane With lithium diisopropyl amide in tetrahydrofuran; hexane T=-78 - 0°C; 2: N-methyl-N-methoxy cyclohexanecarboxamide in tetrahydrofuran; hexane T=-78 - 20°C; 3: With hydrogenchloride in tetrahydrofuran; hexane; water T=0°C;

oxygen; pivalaldehyde in acetonitrile 36 h;