4-Aminothioureaprolinal Dithioacetal as a Catalyst for Highly Enantioselective Michael Additions of Ketones and Aldehydes to Nitroolefins

Multifunctional phosphoramide-(S)-prolinamide derivatives as efficient organocatalysts in asymmetric aldol and Michael reactions

Knowledge accumulated in the field of organocatalysis led to the design and synthesis of three novel and efficient organocatalysts for the stereoselective aldol and Michael reactions in the presence of water.

Michael addition of carbonyl compounds to nitroolefins under the catalysis of new pyrrolidine-based bifunctional organocatalysts

Novel bifunctional pyrrolidine-based organocatalysts for the asymmetric Michael addition of carbonyl compounds to nitroolefins have been synthesised from homoallylamines, which are easily obtained from (R)-glyceraldehyde as a chiral precursor. Under optimal reaction conditions, these bifunctional organocatalysts showed a high catalytic efficiency (almost quantitative yield in most cases) and stereoselectivity in the Michael addition reactions of a variety of aldehydes (up to 98 : 2 dr and 97% ee) and ketones (up to 98 : 2 dr and 99% ee) to nitroolefins.

Highly enantioselective Michael reaction employing cycloheptanone and cyclooctanone as nucleophiles

An organocatalytic Michael reaction of cycloheptanone and cyclooctanone with nitrodienes and nitroolefins catalyzed by primary amine catalysts has been accomplished.

Continuous asymmetric Michael addition of ketones to β-nitroolefins over (1R,2R)-(+)-1,2-DPEN-modified sulfonic acid resin

A trifunctional catalyst was successfully prepared by bonding (1R,2R)-(+)-1,2-DPEN to sulfonic acid resin.

Hydrogen-bonding in aminocatalysis: from proline and beyond

This Concept article summarizes recent progress in the field of hydrogen-bonding aminocatalysis using proline-derived systems. The aminocatalysts available in the literature are categorized by the incorporated hydrogen-bonding scaffold and its mode of recognition. Both mono- and double-hydrogen-bonding motifs are discussed and examples of their application in asymmetric synthesis are given.