Table 2. Cu(II)-Mediated Amidations of Aromatic C−H Bondsa.
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Standard reaction condition: heterocycle (1.0 equiv), nucleophile (5.0 equiv), Cu(OAc)2 (0.2 equiv), Na2CO3 (2.0 equiv), pyridine (20.0 equiv), toluene, O2 (balloon), 120−140 °C, 12−30 h. Yields correspond to isolated products.
Cu(OAc)2 (2.0 equiv), Na2CO3 (3.0 equiv).
Cu(OAc)2 (1.0 equiv), pyridine (5.0 equiv).
Cu(OAc)2 (1.0 equiv), K2CO3 (2.0 equiv) instead of Na2CO3.
14 (5.0 equiv), 2a (1.0 equiv), pyridine (5.0 equiv), K2CO3 (2.0 equiv).