Abstract
A new class of axially-unfixed biaryl-based pyrrolidines with C2-symmetry were designed and synthesized by using enantiopure α-proline as a chiral source. These bifunctional organocatalys provided Michael adducts in high chemical yields (up to 99 %) and with excellent stereoselectivities (up to 99:1 dr and 96 % ee) in the direct Michael addition reactions of a variety of ketones and aldehydes to nitro olefins. The transition states were proposed to clarify the stereochemical course of the examined reactions.
Published Version
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