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Synthesis of 5- and 6-Azaindoles by Sequential Site-Selective Palladium-Catalyzed C-C and C-N Coupling Reactions

Nguyen Thi Son, Tuan Anh Nguyen Tien, Marian Blanco Ponce, Peter Ehlers, Ngo Thi Thuan, Tuan Thanh Dang*, Peter Langer*

*Hanoi University of Science, Vietnam National University (VNU), Vietnam; University of Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany, Email:,

N. T. Son, T. A. N. Tien, M. B. Ponce, P. Ehlers, N. T. Thuan, T. T. Dang, P. Langer, Synlett, 2020, 31, 1308-1312.

DOI: 10.1055/s-0040-1707853

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Site-selective Pd-catalyzed Sonogashira reactions of 3,4-dibromopyridine with alkynes, followed by Pd-catalyzed tandem C-N couplings and cyclizations with amines provide 6-azaindoles in very good yield. On the other hand, a 5-azaindole is obtained by a site-selective Pd-catalyzed C-N coupling reaction of 3,4-dibromopyridine with 4-toluidine, followed by C-C coupling and cyclization with phenylacetylene.

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Key Words

fused heterocycles, C-N coupling, azaindoles, palladium catalysis, Sonogashira reaction, Buchwald-Hartwig reaction

ID: J72-Y2020