1.
Peptide Catalyzed Conjugate Additions to ß-Nitroacrylates - Steric Bulk Increases the Reaction Rate.
Chemistry
; : e202403178, 2024 Sep 18.
Artículo
en Inglés
| MEDLINE
| ID: mdl-39292602
RESUMEN
The organocatalytic conjugate addition of aldehydes to ß-nitroacrylates provides direct access to ß-ester-γ-nitroaldehydes and, thereby, common structural motifs of many bioactive compounds. However, the deactivation of amine-based catalysts by alkylation with the highly electrophilic nitroacrylates hampers this reaction. Here, we show that the peptide H-Mep-dPro-dGlu-NH2, which is reluctant to under alkylation, catalyzes this reaction at low catalyst loading (0.5-1 mol%) within short reaction times (15-60 min) to yield a broad range of ß-ester-γ-nitroaldehydes with high stereoselectivity. Kinetic studies revealed that increased steric bulk on the ß-nitroacrylate enhances the reaction rate by hindering catalyst alkylation.