β-unsaturated carboxylicacids from alkynes with CO and H2O was described. The atom-economic hydroxycarbonylation of various symmetrical and unsymmetrical alkynes can be achieved with chemo-, stereo-, and regioselectivity, affording the corresponding carboxylicacids in good to excellent yields. Using water as the reaction solvent, the water-soluble palladium catalyst was easily separated from the product and
描述了亚砜磷改性的钯催化从炔烃与 CO 和 H 2 O合成 α,β-不饱和羧酸。各种对称和不对称炔烃的原子经济羟基羰基化可以通过化学选择性、立体选择性和区域选择性实现,从而以良好到优异的产率提供相应的羧酸。以水为反应溶剂,水溶性钯催化剂容易与产物分离,可重复使用5次。
Synthesis of Vinyl Carboxylic Acids using Carbon Dioxide as a Carbon Source by Iron-Catalyzed Hydromagnesiation
iron‐catalyzed synthesis of α,β‐unsaturated carboxylic acids from alkynes and carbondioxide was developed. This reaction proceeds through hydromagnesiation of alkynes followed by carbondioxide insertion under atmospheric pressure and ambient temperature in the presence of iron and a Grignard reagent as a catalyst and hydride source, respectively. Several symmetrical and unsymmetrical alkynes were transformed
Whereas thermal cyclisation of variously substituted 2,3-diarylacrylazides easily provided a new way to 3-aryl-isoquinolones, nitration of these compounds mainly led to corresponding 3-aryl-4-nitro-isoquinolones. After reduction into 4-amino-3-aryl-isoquinolones, amidification and subsequent cyclization gave the yet unknown title compounds.
Discovery of a new chemical series of BRD4(1) inhibitors using protein-ligand docking and structure-guided design
作者:Bryan C. Duffy、Shuang Liu、Gregory S. Martin、Ruifang Wang、Ming Min Hsia、He Zhao、Cheng Guo、Michael Ellis、John F. Quinn、Olesya A. Kharenko、Karen Norek、Emily M. Gesner、Peter R. Young、Kevin G. McLure、Gregory S. Wagner、Damodharan Lakshminarasimhan、Andre White、Robert K. Suto、Henrik C. Hansen、Douglas B. Kitchen
DOI:10.1016/j.bmcl.2015.04.107
日期:2015.7
Bromodomains are key transcriptional regulators that are thought to be druggable epigenetic targets for cancer, inflammation, diabetes and cardiovascular therapeutics. Of particular importance is the first of two bromodomains in bromodomain containing 4 protein (BRD4(1)). Protein-ligand docking in BRD4(1) was used to purchase a small, focused screening set of compounds possessing a large variety of core structures. Within this set, a small number of weak hits each contained a dihydroquinoxalinone ring system. We purchased other analogs with this ring system and further validated the new hit series and obtained improvement in binding inhibition. Limited exploration by new analog synthesis showed that the binding inhibition in a FRET assay could be improved to the low mu M level making this new core a potential hit-to-lead series. Additionally, the predicted geometries of the initial hit and an improved analog were confirmed by X-ray co-crystallography with BRD4(1). (C) 2015 Elsevier Ltd. All rights reserved.
Joerlander, Chemische Berichte, 1917, vol. 50, p. 417