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Reaction conditions: 1 (0.2 mmol, 1.0 equiv.), 2 (0.3 mmol, 1.5 equiv.), AlCl3 (20 mol%), DCE (0.1 M), −20 °C, and 12 h. Diastereomeric ratios were determined by 1H NMR analysis of the crude reaction mixture. Isolated yield.
In(OTf)3 (20 mol%) instead of AlCl3 (20 mol%).
