Multicomponent synthesis of tripeptides containing pipecolic acid derivatives: selective induction of cis- and trans-imide bonds into peptide backbones
A simple approach to several tripeptides consisting of two terminal glycine fragments and a central pipecolic acid derivative was found via a multicomponent reaction starting from tetrahydropyridines. The protected peptides 2a–g were formed in high yields and with different substitution patterns of the central heterocyclic amino acid. In cases where chiral imines were used the target compounds were obtained with remarkable diastereoselectivity. The influence of different substituents attached to the pipecolic acid fragment on N-terminal amide isomerism was investigated using X-ray crystallography and NMR spectroscopic methods.
通过以四氢吡啶为起点的多组分反应,我们找到了一种简单的方法来制备由两个末端甘氨酸片段和一个中心哌啶醇酸衍生物组成的多种三肽。受保护的肽 2a-g 产量很高,而且中心杂环氨基酸的取代模式各不相同。在使用手性亚胺的情况下,获得的目标化合物具有显著的非对映选择性。利用 X 射线晶体学和核磁共振光谱法研究了连接在哌啶醇酸片段上的不同取代基对 N 端酰胺异构体的影响。
SUBSTITUIERTE 2-HETEROCYCLYL-IMIDAZOLYL-CARBOXAMIDE ALS SCHÄDLINGSBEKÄMPFUNGSMITTEL
申请人:Bayer CropScience Aktiengesellschaft
公开号:EP3497101B1
公开(公告)日:2020-12-30
The Synthesis of Novel Cyclic β-Amino Acids as Intermediates for the Preparation of Bicyclic β-Lactams
homopipecolic acid are prepared by α-amino alkylation of malonic acid with cyclic imines 6 and 7. These are prepared on a large scale and with different substitution patterns. The β-aminoacids 8 and 9 were formed in high yield and with remarkable diastereoselectivity if chiral imines are used as starting materials. The diastereoselectivity of the amino alkylation leading to homopipecolic acid analogues