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Synthesis of maleimide pyridocarbazole 7. a Reaction conditions: First, 1.1 equiv of 8, 1.0 equiv 9, 0.1 equiv of Pd(0) catalyst, 2.75 equiv Na2CO3, DME/H2O, reflux, overnight, then 10:1 mass ratio silica gel:indole, high vacuum, 80 °C, overnight.
