Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 31, Pages 9950-9954Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201805680
Keywords
arylation; C-H activation; enantioselectivity; heterocycles; rhodium
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Funding
- Deutsche Forschungsgemeinschaft (Leibniz Award)
- Fonds der Chemischen Industrie
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The first rhodium(I)-catalyzed enantioselective intermolecular C-sp3-H activation of various saturated aza-heterocycles including tetrahydroquinolines, piperidines, piperazines, azetidines, pyrrolidines, and azepanes is presented. The combination of a rhodium(I) precatalyst and a chiral monodentate phosphonite ligand is shown to be a powerful catalytic system to access a variety of important enantio-enriched heterocycles from simple starting materials. Notably, the C-sp3-H activation of tetrahydroquinolines is especially challenging due to the adjacent C-sp2-H bond. This redox-neutral methodology provides a new synthetic route to -N-arylated heterocycles with high chemoselectivity and enantioselectivity up to 97%ee.
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