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(2S)-2-(Phenylsulfinyl)methylpyrrolidine, derived from l-proline, has been demonstrated as an efficient organocatalyst for the asymmetric Michael addition of cyclohexanone and cyclopentanone to β-nitrostyrenes. This pyrrolidine-based catalyst bearing a sulfoxide moiety was used to synthesize various γ-nitro carbonyl compounds in high yield (up to 97%) with excellent stereoselectivity (up to >99:1 dr and >99% ee) without the use of any additive.
Singh et al. (Fri,) studied this question.