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a Reaction conditions: 1 (0.25 mmol), 2a (0.30 mmol), Cu(OAc)2 (10 mol%), L1 (20 mol%), DEAD (20 mol%), K2CO3 (0.25 mmol), MeCN (3 mL), under N2, 80 °C, 10 h. Yields of the isolated products are given. NPhth = phthalimidyl.
