Synthesis 2018; 50(09): 1827-1840
DOI: 10.1055/s-0036-1591916
paper
© Georg Thieme Verlag Stuttgart · New York

(R)- and (S)-Proline-Derived Chiral Phosphoramides as Organo­catalysts for the Enantiodivergent Aldol Reaction of Isatins with Cyclohexanone in the Presence of Water

Carlos Cruz-Hernández
a   Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN 2508, 07360 Ciudad de México, Mexico
,
Perla E. Hernández-González
a   Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN 2508, 07360 Ciudad de México, Mexico
,
a   Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN 2508, 07360 Ciudad de México, Mexico
b   El Colegio Nacional, Luis González Obregón 23, Centro Histórico, 06020 Ciudad de México, Mexico   eMail: juaristi@relaq.mx
› Institutsangaben

This work was financially supported by CONACYT (Consejo Nacional de Ciencia y Tecnología) Mexico via Grant 324029.
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Publikationsverlauf

Received: 10. November 2017

Accepted after revision: 20. Dezember 2017

Publikationsdatum:
05. Februar 2018 (online)


Abstract

Novel organocatalysts derived from (R)- and (S)-proline and incorporating a chiral phosphoramide fragment were rationally designed and subsequently synthesized. These chiral compounds catalyze the enantioselective aldol addition reaction of cyclohexanone to prochiral isatins in the presence of water. These observations are particularly relevant since reports of asymmetric aldol reactions between cyclohexanone­ and isatins catalyzed by chiral secondary amines remain scarce, with primary amines being the most studied and successful catalysts. The present report includes a thorough evaluation of the new bifunctional catalysts that actually give rise to either enantiomer of the chiral product by proper selection of the configuration of the proline moiety.

Supporting Information