作者:Burkhard König、Prantik Maity
DOI:10.1055/s-2006-942497
日期:2006.8
We describe the synthesis of a novel chiral dipeptide β-sheet mimic based on aminomethyl-3-oxo-2,3-dihydropyrrole carboxylic acids. The synthesis uses a palladium-catalyzed allylation with the chiral Trost ligand as a key step for the construction of a quaternary chiral center. This allows the enantioselective conversion of 2-carboxy-3-hydroxy-pyrrole into 3-oxo-2,3-dihydropyrrole-2-allyl-2-carboxylate. The allyl group is subsequently converted into an aldehyde or ester group. Peptide coupling of the 3-oxo-2,3-dihydropyrrole amino acid leads to more extended systems with partially constrained dipeptide units.
我们描述了基于氨甲基-3-氧代-2,3-二氢吡咯羧酸的新型手性二肽β-片模拟物的合成。该合成采用钯催化的手性 Trost 配体烯丙基化作为构建四级手性中心的关键步骤。这使得2-羧基-3-羟基-吡咯对映选择性转化为3-氧代-2,3-二氢吡咯-2-烯丙基-2-羧酸酯。随后将烯丙基转化为醛基或酯基。 3-氧代-2,3-二氢吡咯氨基酸的肽偶联导致具有部分受限二肽单元的更扩展的系统。