Synthesis 2018; 50(17): 3445-3459
DOI: 10.1055/s-0036-1592005
paper
© Georg Thieme Verlag Stuttgart · New York

Proline-Glycine Dipeptidic Derivatives of Chiral Phosphoramides as Organocatalysts for the Enantiodivergent Aldol Reaction of Aryl Aldehydes and 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   Email: ejuarist@cinvestav.mx
› Author Affiliations
This work was financially supported by CONACYT (Consejo Nacional de Ciencia y Tecnología) Mexico via grant 324029.
Further Information

Publication History

Received: 05 March 2018

Accepted after revision: 26 March 2018

Publication Date:
29 May 2018 (online)


Abstract

The synthesis of several novel organocatalysts derived from (R)- and (S)-proline-glycine dipeptides and incorporating a chiral phosphoramide fragment was accomplished. These chiral compounds catalyze the enantioselective aldol addition reaction of cyclohexanone to prochiral aryl aldehydes and isatins in the presence of water. These chiral organocatalysts represent some of the few proline-derived compounds capable to catalyze aldol-type addition of cyclohexanone to isatins, a C–C bond forming transformation for which chiral primary amines are usually more successful. Additionally, these phosphoramide-containing catalysts afforded excellent results in the addition of cyclohexanone to aryl aldehydes, as anticipated by the presence of the proline moiety. The present report includes a detailed evaluation of the new multifunctional catalysts that are able to afford either enantiomer of the chiral product by adequate selection of the configuration of the proline residue.

Supporting Information