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Polyene cyclizations offer rapid entry into terpenoid ring systems. Although enantioselective cyclizations of (E)‐polyenes to form trans‐decalin ring systems are well precedented, highly enantioselective cyclizations of (Z)‐polyenes to form the corresponding cis‐decalins have not been reported. Here, we describe the first application of iminium catalysis to the initiation of polyene cyclizations....
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