aReaction conditions are as follows: 1a (2.0 mmol, 10 equiv), 2 (0.2 mmol, 1 equiv), Et3N (1.0 mmol, 5 equiv), 1,4-dioxane (0.4 mL), 4CzIPN (5 mol %), room temperature (temperature around reaction flask was 35 °C due to heating caused by the LED lamp), 24 h. All yields are isolated. b1a (5 equiv). cReaction in DMSO (0.4 mL).