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Covalent-organic frameworks with keto-enol tautomerism for efficient photocatalytic oxidative coupling of amines to imines under visible light

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Science China Chemistry 2021年第12期64卷 2169-2179页

作者： Zhenyu Wu Xiubing Huang Xiangjun Li Guangtong Hai Baozhen Li Ge Wang Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China

Photocatalytic oxidation of organic molecules into highly value-added products is an innovative and challenging research which has gradually attracted remarkable attention of *** this work,it is demonstrated that the COF-TpPa with keto-enol tautomerism equilibrium structure shows excellent performance(yield>99%after 8 h)in the selective photocatalytic oxidative coupling of amines to imines under visible light *** is revealed that three kinds of reactive oxygen species(superoxide radical,hydroxyl radical and singlet oxygen)participate in this photocatalytic oxidation *** addition,hydrogen protons cleaved from the benzyl are proven to be reduced to hydrogen in the conduction band of COF-TpPa in anaerobic atmosphere,accompanied with the formation of *** direct hydrogen evolution from amine provides an effective way to extract clean energy from organic molecule as well as the production of value-added *** a contrast,COF-LZU1 with similar structure and chemical composition to COF-TpPa but without keto-enol tautomerism exhibits worse optical properties and photocatalytic *** is also demonstrated that keto-enol tautomerism favors the adsorption of benzylamine based on the characterization results and theoretical calculations.

关键词： covalent-organic frameworks photocatalysts aerobic/anaerobic benzylamine oxidation keto-enol tautomerism

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Unprecedented sesquiterpene-polycyclic polyprenylated acylphloroglucinol adduct against acute myeloid leukemia via inhibiting mitochondrial complex Ⅴ

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Chinese Chemical Letters 2024年第10期35卷 305-308页

作者： Zhengyi Shi Jie Yin Yang Xiao Zhangrong Hou Fei Song Jianping Wang Qingyi Tong Changxing Qi Yonghui Zhang Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation School of PharmacyTongji Medical CollegeHuazhong University of Science andTechnologyWuhan430030China

Monosescinol A(1),the first example of sesquiterpene–polycyclic polyprenylated acylphloroglucinol(PPAP)adduct,which represented a new subclass of PPAP-type natural products,along with two new congeners with normal spiro 6/6/5 tricyclic architecture,were isolated from Hypericum *** A possessed an unprecedented 6/5/5/6/6 pentacyclic carbon skeleton that might be assembled from the 6/6/5 carbon skeleton,via the splitting decomposition of C-3/C-14,and the attack from the C-3 in the PPAP core to C-28 in sesquiterpene *** addition,we have firstly confirmed that 24R configuration was existed in sec–Bu containing PPAPs by single crystal diffraction data analysis of monosescinol B(2),that might provide an enlightenment in the configurational determination of sec–Bu containing ***,further pharmacological research has found that compound 1 exhibited remarkable pharmacological effects against acute myeloid leukemia(AML)cell lines,with direct inhibition of mitochondrial complex V and an increase in mitochondrial membrane potential,and led to an induction of oxidative stress,endogenous inflammation,and apoptosis of AML cells.

关键词： PPAP adduct Single-crystal X-ray diffraction keto-enol tautomerism Plausiblebiosynthetic pathway Cytotoxic activity

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A Quantitative Study of Solvent Effects on keto-enol Tautomeric Equilibria

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Chemical Research in Chinese Universities 1990年第1期6卷 76-79页

作者： Chen Zikang (Department of Chemistry, Beijing Normal University, Beijing)Zhang Yuejun (Elemento-Organic Chemistry Laboratory, Nankai University, Tianjin)

Introduction Organic compounds usually have labile bonds. It is well known that thousands of reactions are carried out in solutions, only a few in the gas-phase. Most chemists are now familiar with the fact that solvent may have a strong influence on reaction rate and equilibrium, so in the last decade, resarching the influence of solvent effects on reaction rate and reaction equilibrium was a very important and

关键词： Solvent effects keto-enol tautomerism N-acetoacetylpyrrole

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Supramolecular Encapsulation of Alagebrium by Cucurbit[7]uril Inhibited the H/D Exchange of both its Carbonyl α-Hydrogen and Thiazolium C（2）-Hydrogen

Supramolecular Encapsulation of Alagebrium by Cucurbit[7]uri...

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全国第十八届大环化学暨第十届超分子化学学术讨论会

作者： Shengke Li Ruibing Wang State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical Sciences University of Macau

＜正＞Background keto-enol tautomerism,which refers to the interconversion equilibrium between keto form and enol form,has drawn considerable interest due to its crucial role in both organic reaction and biological transformation.[1]Moreover,the degradation of many biologically important molecules is often attributed to the labile carbonylα-*** have previously reported

关键词： Cucurbituril Alagebrium keto-enol tautomerism H/D exchange C(2)-Hydrogen

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