Palladium-Catalyzed Enantioselective Intramolecular Dearomative Heck Reaction

Enantioselective intramolecular dearomative Heck reactions have been developed by Pd-catalyzed cross-coupling of aryl halides or aryl triflates with the internal CC bond of indoles, benzofurans, pyrroles, and furans. A variety of structurally unique spiroheterocycles and benzofused heterocycles hav...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2018-10, Vol.140 (42), p.13945-13951
Main Authors: Li, Xiang, Zhou, Bo, Yang, Run-Ze, Yang, Fu-Ming, Liang, Ren-Xiao, Liu, Ren-Rong, Jia, Yi-Xia
Format: Article
Language:English
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Summary:Enantioselective intramolecular dearomative Heck reactions have been developed by Pd-catalyzed cross-coupling of aryl halides or aryl triflates with the internal CC bond of indoles, benzofurans, pyrroles, and furans. A variety of structurally unique spiroheterocycles and benzofused heterocycles having N/O-substituted quaternary carbon stereocenters, and exocyclic olefin moieties were afforded in moderate to excellent yields with good to excellent enantioselectivities, showing a broad scope of the present protocol. A series of new BINOL- and H8-BINOL-based phosphoramidite ligands were synthesized and proved to be efficient chiral ligands in the reactions of C2-tethered substrates to form spiroheterocycles. (S)-SEGPHOS turned out to be a good ligand for the reaction delivering benzofused indolines and pyrrolines. Synthetic applications based on transformations of the exocyclic double bonds were realized without loss of enantiopurities, including hydrogenation, hydroborylation, and stereospecific ring-expanding rearrangement.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.8b09186