Optically Active Aromatic and Heteroaromatic α-Amino Acids by a One-Pot Catalytic Enantioselective Addition of Aromatic and Heteroaromatic C−H Bonds to α-Imino Esters
作者:Steen Saaby、Pau Bayón、Pompiliu S. Aburel、Karl Anker Jørgensen
DOI:10.1021/jo0256787
日期:2002.6.1
procedure for the synthesis of non-natural aromatic and heteroaromatic alpha-amino acids is reported. Starting from readily available starting materials and application of a chiral BINAP-Cu(I) catalyst, the optically active products are formed with readily removable N-protecting groups. The scope of the reaction is demonstrated by the addition of substituted furans, thiophenes, pyrroles, and aromatic compounds
Bifunctional peptide-thiourea organocatalysts enantioselectively catalyzeMannichreaction between tosyl-protected glyoxylate imine and pyruvate esters. N-terminal proline moiety is responsible for the stereoinduction of this reaction. DFT calculations, NMR spectroscopy, and mass spectrometry confirm bifunctional nature of the catalyst and simultaneous activation of both substrates.