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Tandem [3,3]-sigmatropic rearrangement-[2+2]-cyclization reaction scope. Unless otherwise noted, all reactions were carried out with 1 (0.05 mmol) in toluene (1.0 mL) for 3 h. Yields are determined by NMR spectroscopy. ee was determined by chiral HPLC analysis and are averages from two runs. aAbsolute configuration assigned by VCD (see Supporting Information).
