1: [(3R,5R)-3,5-bis-(tert-butyldimethylsilanyloxy)cyclohexylidene]-ethanol With n-butyllithium; p-toluenesulfonyl chloride in tetrahydrofuran; hexane
T=0°C; 3 h;
2: bis-diphenylphosphine With n-butyllithium in tetrahydrofuran
T=0°C; 2 h;
3: With dihydrogen peroxide in dichloromethane
T=22°C; 3.5 h;
