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Reactions were conducted with 1a (0.4 mmol), 2a (0.2 mmol), 4-nitrophthalonitrile cat1 (0.02 mmol) in DMSO (2 mL) under nitrogen atmosphere at room temperature with 390 nm LEDs irradiation for 24 h. All yields were calculated after isolation. aReactions were conducted with 1k (0.4 mmol) and 2 (0.2 mmol).
