Synthesis of earthy-mouldy smelling compounds - II. Ethyl α and β-fenchols

Article abstract of DOI:10.1016/S0040-4039(00)94718-X

Several stereoselective routes to both ethyl α- and β- fenchols 1α and 1β are discussed. Direct addition of ethyllithium to fenchone was the best route to 1α whereas obtention of 1β was achieved through the highly stereoselective retroethylnylation of a mixture of ethynyl α- and β-fenchols 4α and 4β.