A facile Lewis‐acid‐catalyzed method for the synthesis of structurally diverse sesquiterpenoid derivatives from readily available and abundant 11‐membered natural product zerumbone has been developed. Starting from zerumbone, we have developed an efficient cyclization process for the creation of [5.7], [5.8], and [5.8.3] fused‐ring systems. This process was exemplified by the selective functionalization of zerumbone; by controlling the conformation of the 11‐membered ring, the ring‐closing process could be tuned to afford the fused‐ring system of choice.