Synthesis of new exo- and endo-3,8-dihydro-beta-santalols and other norbornyl-derived alcohols.

Several new and differently functionalized cis-2,3-dimethylnorbornane derivatives presenting diverse side-chain lengths were prepared, the structures of which are related to the natural fragrance beta-santalol. In particular, exo- and endo-3,8-dihydro-beta-santalols, with either (E) or (Z) C==C-bond configuration on the side chain, were synthesized in seven steps and 21-24% overall yields. Several other exo- and endo-norbornyl alcohols with shorter side chains were also prepared in high yields. The olfactory evaluation indicated woody, sandalwood, as well as fruity notes for some of the derivatives.

New norbornyl derivatives as woody fragrant materials.

The optimization of a Diels-Alder reaction to prepare a novel ketone bearing a 2,3-dimethylnorbornyl group is presented together with the structure elucidation of the isomers. Employing this new ketone as starting material, derivatives with new woody odor notes as well as attempts to obtain ambery-musky odorants are reported.