Asymmetric epoxidation using iminium salt organocatalysts featuring dynamically controlled atropoisomerism

Philip C. Bulman Page, Christopher J. Bartlett, Yohan Chan, David Day, Phillip Parker, Benjamin R. Buckley, Geracimos A. Rassias, Alexandra M. Z. Slawin, Steven M. Allin, Jérôme Lacour, André Pinto

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Introduction of a pseudoaxial substituent at a stereogenic center adjacent to the nitrogen atom in binaphthyl- and biphenyl-derived azepinium salt organocatalysts affords improved enantioselectivities and yields in the epoxidation of unfunctionalized alkenes. In the biphenyl-derived catalysts, the atropoisomerism at the biphenyl axis is controlled by the interaction of this substituent with the chiral substituent at nitrogen.
Original languageEnglish
Pages (from-to)6128-6138
Number of pages11
JournalThe Journal of Organic Chemistry
Issue number14
Publication statusPublished - 2012

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