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Multicomponent combinatorial development and conformational analysis of prolyl peptide-peptoid hybrid catalysts: application in the direct asymmetric Michael addition.
de la Torre, Alexander F; Rivera, Daniel G; Ferreira, Marco A B; Corrêa, Arlene G; Paixão, Márcio W.
Affiliation
  • de la Torre AF; Departamento de Química, Universidade Federal de São Carlos , São Carlos, SP 13565-905, Brazil.
J Org Chem ; 78(20): 10221-32, 2013 Oct 18.
Article in En | MEDLINE | ID: mdl-24053491
A solution-phase combinatorial approach based on the Ugi four-component reaction was implemented for the development of new prolyl peptide-peptoid hybrid catalysts. Three different elements of diversity were varied during the creation of the set of catalysts: the amine, oxo, and isocyano components. The multicomponent nature of this process enabled the straightforward generation of a series of peptide-peptoid hybrids having the generic sequence Pro-N-R(1)-Xaa-NHR(3), with Xaa being either Gly (R(2) = H) or Aib (R(2) = gem-Me) and R(1) and R(3) either alkyl or amino acid substituents. The catalytic behavior of the peptide-peptoid hybrids was assessed in the asymmetric conjugate addition of aldehydes to nitroolefins, where most of the catalysts showed great efficacy and rendered the Michael adducts with good to excellent enantio- and diastereoselectivity. A molecular modeling study was performed for two distinct catalysts aiming to understand their conformational features. The conformational analysis provided important information for understanding the remarkable stereocontrol achieved during the organocatalytic transformation.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Peptides / Proline / Aldehydes / Amino Acids Language: En Journal: J Org Chem Year: 2013 Document type: Article Affiliation country: Brazil Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Peptides / Proline / Aldehydes / Amino Acids Language: En Journal: J Org Chem Year: 2013 Document type: Article Affiliation country: Brazil Country of publication: United States