Asymmetric Conjugate Addition of Phosphonates to Enones Using Cinchona–Diaminomethylenemalononitrile Organocatalysts
2020
Asymmetric conjugate additions of phosphonates to trans-crotonophenone and chalcone derivatives using a diaminomethylenemalononitrile organocatalyst resulted in generation of the corresponding chiral γ-ketophosphonates in high yields with excellent enantioselectivities (up to 95% ee). This report is the first successful example of asymmetric 1,4-additions of phosphonate to α,β-unsaturated ketones using an organocatalyst.
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