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DOI: 10.1055/s-0031-1289753
Tandem One-Pot Construction of Indoles via Palladium and Copper-Catalyzed Coupling Reactions of the Blaise Reaction Intermediate
Publication History
Publication Date:
29 March 2012 (online)
Abstract
The palladium-catalyzed intramolecular N-arylation of the Blaise reaction intermediate, formed by reaction of nitriles with an in situ generated Reformatsky reagent from ethyl α-bromo-α-(2-bromophenyl)acetate and zinc, afforded indoles in good yields. Extension of this approach to the chemoselective intramolecular N-alkylation/palladium-catalyzed N-arylation of the Blaise reaction intermediate, having ω-chloroalkyl appendages, provided a novel route for the tandem one-pot synthesis of N-fused indole derivatives. In contrast, the intermolecular coupling reaction of the Blaise reaction intermediates with 1,2-dihalobenzene did not proceed in the presence of a palladium catalyst, but proceeded in the presence of copper(I) iodide as the catalyst and resulted in indoles.
1 Introduction
2 Results and Discussion
2.1 Palladium-Catalyzed Intramolecular C-N Coupling Reaction of the Blaise Reaction Intermediate
2.2 Chemoselective Intramolecular N-Alkylation/Palladium-Catalyzed C-N Coupling Reaction of the Blaise Reaction Intermediate
2.3 Copper-Catalyzed Intermolecular N-C/C-C Coupling Reaction of the Blaise Reaction Intermediate with 1,2-Dihaloarenes
3 Conclusion
Key words
tandem reaction - Blaise reaction - palladium - copper - coupling - indoles
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