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Scope of the dienes.[a–c]
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[a] Standard conditions: diene (0.4 mmol, 2 equiv), 2 b (0.2 mmol), 3 (0.4 mmol, 2 equiv), NiCl2⋅6 H2O (10 mol %), PC‐I (1 mol %), dtbpy (15 mol %), MeCN (2.0 mL, 0.1 m), rt, blue LEDs, 24–36 h. [b] Yield after purification. [c] The regioselectivity was determined by NMR analysis (see the Supporting Information).
