Ortho-Directed Metalation of 3-Carboxy-β-carbolines: Use of the SmI₂-Cleavable 9-N-(N‘,N‘-Dimethylsulfamoyl) Blocking Group for the Preparation of 9-N-Deprotected 4-Amino Derivatives via Azide Introduction or a Palladium-Catalyzed Cross-Coupling Reaction

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