Total Synthesis of β‐Bulnesene and 1‐Epi‐β‐bulnesene by Intramolecular Photoaddition

Abstract dl‐β‐Bulnesene (1) and dl‐1‐epi‐α‐bulnesene (15) have been synthesized starting from the bromide 4 (Schemes 2 and 3). In the key step 9→10 the bonds of the final product were formed by an intramolecular photoaddition. The synthesis was completed by the fragmentation 12→14 and the Wittig reaction 14→15+1.