哌嗪杂环包含在大量 FDA 批准的药物和生物探针化合物中。然而,在结构上,这些化合物大多局限于两个环氮原子上的取代,通过碳取代使哌嗪化学多样性的扩展合理化。基于系统化学多样性的概念,开发了一个发散的六步合成,其中手性氨基酸以高非对映选择性转化为顺式或反式5-取代的哌嗪-2-乙酸酯,可以通过色谱法使非对映异构体均匀。从六种市售氨基酸或它们各自的氨基醇(两种对映体)开始,我们获得了一整套 24 种受保护的手性 2,5-二取代哌嗪,作为数克数量的单一立体异构体。这些多样化且用途广泛的哌嗪可在任一氮原子上进行功能化,使其可用作平行库合成的起始材料,以及用作靶向生产更复杂的 C 取代哌嗪化合物的中间体。
The synthesis and application of a newly designed C2-symmetric chiral bifunctional triamine family (C2-CBT) is reported. These enantiopure chiral triamine scaffolds can be accessed in multigram amounts from simple amino acids while avoiding chromatographic purification. As a proof of principle, C2-CBT has been studied in the aldol reaction of cyclic ketones with isatins, with the target tertiary alcohols
Conformationally Programmable Chiral Foldamers with Compact and Extended Domains Controlled by Monomer Structure
作者:Zachariah Lockhart、Peter C. Knipe
DOI:10.1002/anie.201802822
日期:2018.7.9
Foldamers are an important class of abiotic macromolecules, with potential therapeutic applications in the disruption of protein–protein interactions. The majority adopt a single conformational motif such as a helix. A class of foldamer is now introduced where the choice of heterocycle within each monomer, coupled with a strong conformation‐determining dipole repulsion effect, allows both helical and