Synthesis, inverse docking-assisted identification and in vitro biological characterization of Flavonol-based analogs of fisetin as c-Kit, CDK2 and mTOR inhibitors against melanoma and non-melanoma skin cancers
15-Cl2-DHTP–boron complex catalyst for the asymmetric Diels–Alder cycloaddition of 2′-hydroxychalcones and dienes was developed and tested. The resulting cyclohexenes with three chiral centers were obtained in high yields (up to 98%) with excellent stereoselectivities (up to >20:1 endo/exo, >99% ee). This catalytic system features high efficiency, broad substrate scopes, and mild reaction conditions. In
(小号)-2,15-CL 2 -DHTP -硼为2'-hydroxychalcones和二烯不对称狄尔斯-阿尔德环加成配合物催化剂进行开发和测试。得到的具有三个手性中心的环己烯以高收率(高达98%)和优异的立体选择性(高达> 20:1 end / exo,> 99%ee)获得。该催化系统具有高效,广泛的底物范围和温和的反应条件的特点。另外,进行了DFT研究以解释不对称诱导的立体化学过程。
Enantioselective [2+2] Photocycloaddition Reactions of Enones and Olefins with Visible Light Mediated by
<i>N</i>
,
<i>N</i>
′‐Dioxide–Metal Complexes
A 2‐alkenoylpyridine‐bound N,N′‐dioxide–TbIII complex has been found to absorb visible light to reach the excited state, leading to the direct visible‐light‐excited catalytic enantioselective [2+2] cycloaddition of 2‐alkenoylpyridines to various alkenes in the absence of an additional photosensitizer. Diverse enantioenriched cyclobutanes were successfully obtained (yields up to 70 %, >19:1 d.r., 92 %
Substituent‐Controlled Divergent Cascade Cycloaddition Reactions of Chalcones and Arylalkynols: Access to Spiroketals and
<i>Oxa</i>
‐Bridged Fused Heterocycles
作者:Tianlong Zeng、Jingyang Kong、Hongkai Wang、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1002/adsc.202100523
日期:2021.8.13
Herein, we report substituent-controlled divergentcascadecycloadditionreactions of chalcones and arylalkynols in the presence of PtI2. Depending on the substituent on the chalcone, either spiroketals or oxa-bridged fusedheterocycles could be obtained in the ranges of 86–97% and 87–95% yields under identical reaction conditions. Control experiments were carried out to elucidate the origin of the
Optimized Palladium(0)-catalyzed Suzuki Cross-coupling Reaction of Polystyrene-supported Selenenyl Flavanones: A Convenient Preparation of Biaryl-chromen-4-one
作者:E Tang、Wen Li、Zhangyong Gao、Lianpeng Zhang、Qiushi Ma
DOI:10.1002/cjoc.201280023
日期:2012.3
Application of the Suzuki cross‐couplingreaction for efficient synthesis of diverse substituted biaryl‐chromen‐4‐ones using an optimized palladium(0) catalyst system is reported. The coupling of arylboronic acids with the resin‐bound bromoflavanones which were prepared by organoselenium‐induced regioselective intramolecular cyclization of bromo‐2‐hydroxylchalcones proceeded smoothly. Biaryl‐chromen‐4‐ones
Synthesis, Molecular Docking Studies and Biological Evaluation o f 3-Iminoaurones as Acetylcholinesterase and Butyrylcholinesterase Inhibitors
作者:Ehsan Ullah Mughal、Amina Sadiq、Bilal Ahmad Khan、Muhammad Naveed Zafar、Ishtiaq Ahmed、Muhammad Zubair
DOI:10.2174/1570180814666170106123959
日期:2017.8.9
techniques (IR, mass spectrometry and NMR spectroscopy) and evaluated in vitro for their inhibitory potential against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) enzymes. All target compounds exhibited varied degree of IC50 values compared to standard Donepezil. Among the series, the compound 6c was found as a potent dual inhibitor of AChE and BChE having IC50values 0.92±0.01 and 2.25±0