Abstract
AbstractEnantiomerically pure 5‐norbornene‐2‐carboxylic acids 4, obtained by asymmetric Diels‐Alder additions, were oxidatively degraded to (+)‐ and (−)‐2‐norbornanone [(+)‐, (−)‐21] and (+)‐ and (−)‐3‐methyl‐2‐norbornanone [(+)‐, (‐)‐11] which were converted into the title compounds by stereoselective alkylations, subsequent cis‐ and trans‐selective Wittig reactions and reductions. Precise optical rotations were determined for (Z)‐ and (E)‐β‐santalol (1 and 2) and β‐santalene (3a) which were obtained by total synthesis and, in addition, by isolation from East Indian sandalwood oil. magnified image
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