Design, Synthesis, and Biological Evaluation of Novel Transrepression-Selective Liver X Receptor (LXR) Ligands with 5,11-Dihydro-5-methyl-11-methylene-6H-dibenz[b,e]azepin-6-one Skeleton
摘要:
To obtain novel transrepression-selective liver X receptor (LXR) ligands, we adopted a strategy of reducing the transactivational agonistic activity of the 5,11-dihydro-5-methyl-11-methylene-6H-dibenz[b,e]azepin-6-one derivative 10, which exhibits LXR-mediated transrepressional and transactivational activity. Structural modification of 10 based on the reported X-ray crystal structure of the LXR ligand-binding domain led to a series of compounds, of which almost all exhibited transrepressional activity at 1 or 10 mu M but showed no transactivational activity even at 30 mu M. Among the compounds obtained, 18 and 22 were confirmed to have LXR-dependent transrepressional activity by using peritoneal macrophages from wild-type and LXR-null mice. A newly developed fluorescence polarization assay indicated that they bind directly to LXR alpha. Next, further structural modification was performed with the guidance of docking simulations with LXR alpha, focusing on enhancing the binding of the ligands with LXR alpha through the introduction of substituents or heteroatom(s). Among the compounds synthesized, compound 48, bearing a hydroxyl group, showed potent, selective, and dose-dependent transrepressional activity.
A direct and structurally divergent synthesis of indole alkaloidsfrom very simple 2‐vinylanilines, alkynes and TBN via a novel substrate fragmentation/cycloaddition strategy has been developed, which provides an efficient noble‐metal‐free approach to access a library of highly valuable indole derivatives of tryptamines and tryptamine‐related oximes, lactams, and lactones, as well as β‐carbolines,
已开发出一种新颖的底物裂解/环加成策略,可从非常简单的2-乙烯基苯胺,炔烃和TBN直接合成并在结构上多样化的吲哚生物碱,这提供了一种无贵金属的有效方法,可访问高度有价值的吲哚衍生物库包括色胺和色胺相关的肟,内酰胺和内酯,以及β-咔啉,螺二吲哚和六氢吡咯并[2,3- b ]吲哚。
Metal-free intramolecular amino-acyloxylation of 2-aminostyrene with carboxylic acid for the synthesis of 3-acyloxyl indolines in water
作者:Liyan Liu、Zhiyong Wang
DOI:10.1039/c7gc00212b
日期:——
A metal-free amino-acyloxylation of 2-aminostyrene was developed for the synthesis of 3-acyloxyl indolines.