Expanding the Scope of Oligo-pyrrolinone–Pyrrolidines as Protein–Protein Interface Mimics
摘要:
Oligo-pyrrolinone-pyrrolidines (generic structure 1) have the potential to interfere with protein-protein interactions (PPIs), but to reduce this to practice it is necessary to be able to synthesize these structures with a variety of different side chains corresponding to genetically encoded proteins. This paper describes expansion of the synthetic scope of 1, the difficulties encountered in this process, particularly issues with epimerization and slow coupling rates, and methods to overcome them. Finally, spectroscopic and physicochemical properties as well as proteolytic stabilities of molecules in this series were measured; these data highlight the suitability of oligo-pyrrolinone-pyrrolidines for the development of pharmacological probes or pharmaceutical leads.
antibacterial, antiproliferative, and cytotoxic activities. The length of the alkyl side chain and the nature of the amino acid residues within the tetramic acid moiety strongly affected activity, in particular against mycobacteria. The mode of action was shown to correlate with the ability of pyreudiones to act as protonophores. Removal of the acidic proton by methylation of pyreudione A resulted in
β-hydroxy-octatrienoyl amide precursor to aburatubolactam also exhibited distinct activity with an IC₅₀ (120 h) value of <2.5 μM. The length of 3-oligoenoyl residues had little influence on the anticancer activity, but 3-alka-oligoenoyl tetramic acids were far more efficacious than their 3-(4-methoxycinnamoyl) congeners. N-H-3-acyltetramic acids were generally more active than their N-Me or N-Boc analogs, unless further
Extended Piperidine–Piperidinone Protein Interface Mimics
作者:Dongyue Xin、Arjun Raghuraman、Kevin Burgess
DOI:10.1021/acs.joc.5b00300
日期:2015.5.1
dichroism (CD) study. Thus, an estimate of 36 Å for the N-to-C distance of a typical conformation of the penta(piperidinone–piperidine) was made. CD spectra of four progressively longer oligomers allowed assignment of elipticity changes around 300 nm that can be attributed to increased conformational ordering of the longer oligomers in solution.
3‐Acyltetramic acids, including delicate 3‐oligoenoyl derivatives, such as the Penicillium metabolite ravenicacid, were prepared in two high‐yielding steps. Reaction of tetramicacids with the ylide Ph3PCCO afforded exclusively the corresponding 3‐acylylidenetetramic acids. These were amenable to Wittig olefinations with aliphatic, aromatic, saturated and unsaturated aldehydes after deprotonation
3-Acyltetramic acid,包括易碎的3-oligoenoyl衍生物,例如青霉代谢产物鼠尾草酸,是通过两个高产率步骤制备的。丁二酸与叶立德Ph 3 PCCO的反应仅提供了相应的3-酰亚乙基四丁酸。这些在用KO t Bu去质子化之后适合于用脂族,芳族,饱和和不饱和醛进行的维蒂希(Wittig)烯化。由于其简单性,对pH敏感基团的选择性和耐受性,该方法优于Jones和Yoshii建立的酰化方案。它也适用于3-酰基电子酸的合成。新的3-寡烯酰基四酸显示出结构依赖性的抗微生物和细胞毒性活性。
Synthesis of new chiral lactam-fused pyridine derivatives
An acid promoted cyclisation of benzylidene-modified tetramic acid and various enamines followed by MnO2 oxidation afforded the corresponding C2-symmetric and unsymmetric lactam-fused pyridines in enantiomerically pure forms.