使用可持续、原子经济和高效(=短)合成途径发现刚性含氮多杂环的新合成途径在有机化学中具有很高的兴趣。在这里,我们描述了一种操作简单且简短的特权支架二氢吡咯并[1,2 - a ]吡嗪二酮的合成方法,该方法由易于获得的起始材料制成。具有潜在生物活性的生物碱型多环支架是通过基于多组分反应 (MCR) 的方案通过 Ugi 四组分反应和不同条件下的 Pictet-Spengler 序列实现的,产生了多样化的产品库。
3-Phenyl-Substituted Imidazo[1,5-a]quinoxalin-4-ones and Imidazo[1,5-a]quinoxaline Ureas That Have High Affinity at the GABAA/Benzodiazepine Receptor Complex
摘要:
A series of imidazo[1,5-alpha]quinoxalin-4-ones and imidazo[1,5-alpha]quinoxaline ureas containing substituted phenyl groups at the 3-position was developed. Compounds within the imidazo-[1,5-alpha]quinoxaline urea series had high affinity for the GABA(A)/benzodiazepine receptor complex with varying in vitro efficacy, although most analogs were partial agonists as indicated by [S-35]TBPS and Cl- current ratios. Interestingly, a subseries of piperazine ureas was identified which had biphasic efficacy, becoming more antagonistic with increasing concentration. Analogs within the imidazo [1,5-alpha] quinoxalin-4-one series had substantially decreased binding affinity as compared to the quinoxaline urea series. These compounds ranged from antagonists to full agonists by in. vitro analysis, with several derivatives having roughly 4-fold greater intrinsic activity than diazepam as indicated by Cl- current measurement. Numerous compounds from both series were effective in antagonizing metrazole-induced seizures, consistent with anti-convulsant properties and possible anxiolytic activity. Most of the quinoxaline ureas and quinoxalin-4-ones were active in an acute electroshock physical dependence side effect assay in mice precluding further development.
A post‐Ugione‐potcascade was developed to access 4‐imidazolidinones through an intramolecular decarboxylativeC(sp3)−Nbondformingreaction. The reaction has a broad tolerance for a variety of substituted aldehydes, anilines, isocyanides and glyoxylic acids. The cascadereaction scope was expanded to synthesize spiroimidazolidinone by the replacement of aldehyde with aliphatic ketone in the Ugi reaction
Diversity-Oriented Synthesis of Imidazo-Dipyridines with Anticancer Activity via the Groebke–Blackburn–Bienaymé and TBAB-Mediated Cascade Reaction in One Pot
A facile and metal-free one-pot protocol for the synthesis of fused imidazopyridine scaffolds has been developed. This novel protocol combines the Groebke-Blackburn-Bienaymé reaction (GBBR) with a sequential TBAB-mediated cyclization cascade. Biological evaluation demonstrated that compound 6a inhibits human prostate cancer cell DU-145 proliferation with an IC50 of 1.6 μM. The molecular mechanism study
Two-Step Synthesis of Complex Artificial Macrocyclic Compounds
作者:Rudrakshula Madhavachary、Eman M. M. Abdelraheem、Arianna Rossetti、Aleksandra Twarda-Clapa、Bogdan Musielak、Katarzyna Kurpiewska、Justyna Kalinowska-Tłuścik、Tad A. Holak、Alexander Dömling
DOI:10.1002/anie.201704426
日期:2017.8.28
the Ugi‐reaction has been developed. This syntheticapproach of just two steps is unprecedented, short, efficient and works over a wide range of medium (8–11) and macrocyclic (≥12) loop sizes. The substrate scope and functional group tolerance is exceptional. Using this approach, we have synthesized 39 novel macrocycles by two or even one single synthetic operation. The properties of our macrocycles