Asymmetric palladium-catalyzed hydroarylation of styrenes and dienes. 2011

Susanne M Podhajsky, and Yasumasa Iwai, and Amanda Cook-Sneathen, and Matthew S Sigman
Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States.

Alkenes are desirable and highly versatile starting materials for organic transformations, and well-known substrates for palladium catalysis. Typically, these reactions result in the formation of a new alkene product via β-hydride elimination. In contrast to this scenario, our laboratory has been involved in the development of alkene hydro- and difunctionalization reactions, where β-hydride elimination can be controlled. We report herein the development of an asymmetric palladium-catalyzed hydroarylation, which yields diarylmethine products in up to 75% ee. Interestingly, a linear free energy relationship is observed between the steric bulk of the ligand within a certain range and the enantiomeric excess of the reaction.

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