cleavage of the protecting groups, hydroxylated chromones and xanthones were assessed as scavenging agents against both reactiveoxygen species (ROS) [superoxide radical (O2*-), hydrogen peroxide (H2O2), hypochlorous acid (HOCl), singletoxygen (1O2), and peroxyl radical (ROO*)] and reactive nitrogen species (RNS) [nitric oxide (*NO) and peroxynitrite anion (ONOO-)]. Generally, all the tested new hydroxylated
One-pot synthesis of 3-(furan-2-yl)-4H-chromen-4-ones from 1-(2-hydroxyphenyl)butane-1,3-diones and 2,5-dimethoxy-2,5-dihydrofuran catalyzed via K10 montmorillonite under solvent-free conditions
A new, concise and efficient method of one-potsynthesis of 3-(furan-2-yl)-4H-chromen-4-ones was developed using K10 montmorillonite catalysis undersolvent-freeconditions.
Enantioselective Synthesis of Chromanones through Organocatalytic Tandem Reactions
作者:Mengxue Lu、Xin Wang、Zongli Xiong、Jingxiang Duan、Wen Ren、Weijun Yao、Yi Xia、Zhen Wang
DOI:10.1002/adsc.202001031
日期:2020.12.8
An enantioselective approach to lactone‐fused chromanone derivatives from 1‐(2‐hydroxyaryl)‐1,3‐diketones and α,β‐unsaturated aldehydes under mild conditions has been developed, which included organocatalytic stepwise Michaeladdition/ cycloketalization/hemiacetalization and followed by oxidation reaction. In the presence of chiral amine organocatalyst and an additional salicylic acid, a wide range
SC2-conjugated fluorescent magnetic nanoparticles (SCNPs) for sensing SA with a fluorogenic response via interacting at an atypical drug binding site. In solution, the highly sensitive and selective fluorogenic response was evaluated by the prominent amplification and blue-shift in the emission maxima of the probes from deep red to dark yellow through an intermediate orange emission. The transformation
肝损伤和肾功能衰竭的全球负担需要技术辅助向代谢标志物的即时 (POC) 测试发展。因此,在当前健康状况普遍存在的情况下,实现现场检测和量化血清白蛋白 (SA) 可以显着有助于阻止死亡率和发病率的增加。在此,我们合理设计和合成了远红光发射、溶剂化荧光变色苯乙烯基色酮 ( SC ) 衍生物SC1和SC2,以及SC2共轭荧光磁性纳米粒子 ( SCNPs ),用于通过以下方式检测具有荧光响应的SA在非典型的药物结合位点相互作用。在溶液中,通过中间的橙色发射,探针的发射最大值从深红色到深黄色的显着放大和蓝移来评估高灵敏度和选择性的荧光反应。通过光谱测量显示了荧光素向荧光团的转变。正如对接研究所揭示的,探针在蛋白质袋中的稳定性归因于非共价相互作用,例如 H 键、阳离子-π 和疏水相互作用。实际应用揭示了SC衍生物的新颖性,通过 (a) 检测从真实血液样本中分离的 SA 的能力开启荧光响应;(b) 使用
作者:Xiaoyi Li、Zihao Li、Rong Zhang、Zhen Zhou、Yonghui Zhang、Yi Xia、Weijun Yao、Zhen Wang
DOI:10.1021/acs.orglett.3c00705
日期:2023.4.21
organocatalyzed stereoselective domino reaction as a facile approach to multicyclic spirooxindolederivatives bearing two stereogenic quaternary carbon atoms is reported. The alkyl-substituted chiral thiourea catalyst was efficient for the reaction to tolerate a wide range of substrates, furnishing a new class of spirooxindolederivatives bearing an O,O-acetal-fused tricyclic skeleton or tetrahydroxanthone moiety