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Palladium-Catalyzed Synthesis of Fused Indoles.-Fused indoles (V) and (IX) are synthesized by two consecutive Pd-catalyzed reactions. Thus, intramolecular Heck reaction of the substrates (I) and (VI) gives cyclized products with good exo selectivity. Separation of the exocyclic isomers (II) and (VII) and reductive Pd-catalyzed N-heteroannulation leads to the targets (V) and (IX) in good overall yield.
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