well affording the corresponding aza-Diels-Alder product in high yield with up to 91% ee at room temperature. The present catalytic enantioselective reaction of imines provided an effective route to opticallyactive nonproteinogenic alpha-amino acids. The products of the catalytic enantioselective aza-Diels-Alder reaction of the cyclic dienes can be used for the preparation of key compounds such as natural
stereoselective synthesis of 4-aminotetrahydropyridines by cycloaddition reaction of 2-amino-1,3-butadienes with N-alkyl and N-aryliminoesters in the presence of a catalytic amount of a Lewis acid is described. The reaction proceeds with differently substituted 2-aminodienes, giving rise to structurally diverse pipecolic acid derivatives.
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