Journal
SYNLETT
Volume -, Issue 20, Pages 3167-3171Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-0028-1087359
Keywords
asymmetric hydrogenation; iridium; P,N-ligands; flavanes; chromanes
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Funding
- Spanish Ministerio de Educacion, Ciencia y Deporte (MECD)
- Fundacion Espanola para la Ciencia y la Tecnologia (FECYT)
- Swiss National Science Foundation
- Federal Commission for Technology and Innovation (KTI)
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Iridium complexes of chiral oxazoline-based P,N-ligands proved to be efficient catalysts for the enantioselective hydrogenation of 2-aryl- and 2-alkyl-4H-chromenes. The best results were obtained with a ligand derived from threonine (ThrePHOX), which induced ee values of 95% to >99% in the hydrogenation of 2-methyl-, 2-cyclohexyl- and various 2-aryl-substituted chromenes.
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