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Reaction conditions: 1 (1 mmol), 2 (0.4 mmol), 3 (0.2 mmol), Ni(dtbbpy)Br2 (10 mol%), NaDT (2 mol%), K2HPO4 (0.4 mmol) in acetone (0.2 M) at 30 °C under irradiation of LEDs (10 W, λ = 390 nm) for 24 hours. Isolated yields. d.r., diastereomeric ratio.
6.0 equivalents of aldehyde 1 and 4.0 equivalents of alkene 2 were used.
