在基于H 2 O 2的选择性氧化中研究了由8个连接的Zr 6簇和四位连接体组成的Zr-abtc和MIP-200金属有机骨架的催化性能,并将其与12配位的UiO-66和UiO进行了比较。 ‐67。Zr-abtc在α,β-不饱和酮中缺电子的C = C键的环氧化方面显示了底物转化和产物选择性方面的优势。1,2-环氧化物在香芹酮环氧化中的显着优势,再加上硫醚氧化中砜的高选择性,表明了Zr-abtc上的亲核氧化机理。Zr-abtc中不饱和酮的环氧化中优异的催化性能与大量弱碱性位点有关。H的亲电活化Zr-abtc在石竹烯中富电子的C = C键的环氧化中具有很高的活性,这也可以实现2 O 2。XRD和FTIR研究证实了催化后Zr-abtc结构的保留。MIP-200在基于H 2 O 2的氧化中的低活性很可能与它的特定亲水性有关,这不利于有机底物和H 2 O 2的吸附。
Activation of H<sub>2</sub>O<sub>2</sub> over Zr(IV). Insights from Model Studies on Zr-Monosubstituted Lindqvist Tungstates
作者:Nataliya V. Maksimchuk、Vasilii Yu. Evtushok、Olga V. Zalomaeva、Gennadii M. Maksimov、Irina D. Ivanchikova、Yuriy A. Chesalov、Ilia V. Eltsov、Pavel A. Abramov、Tatyana S. Glazneva、Vadim V. Yanshole、Oxana A. Kholdeeva、R. John Errington、Albert Solé-Daura、Josep M. Poblet、Jorge J. Carbó
DOI:10.1021/acscatal.1c02485
日期:2021.8.20
(Bu4N)2[W5O18Zr(H2O)3] (1) and (Bu4N)6[W5O18Zr(μ-OH)}2] (2), have been employed as molecular models to unravel the mechanism of hydrogen peroxide activation over Zr(IV) sites. Compounds 1 and 2 are hydrolytically stable and catalyze the epoxidation of C═C bonds in unfunctionalized alkenes and α,β-unsaturated ketones, as well as sulfoxidation of thioethers. Monomer 1 is more active than dimer2. Acid
Zr-单取代的 Lindqvist 型多金属氧酸盐 (Zr-POM),(Bu 4 N) 2 [W 5 O 18 Zr(H 2 O) 3 ] ( 1 ) 和 (Bu 4 N) 6 [W 5 O 18 Zr( μ-OH)} 2 ] ( 2 ),已被用作分子模型来揭示过氧化氢在 Zr(IV) 位点上的活化机制。化合物1和2具有水解稳定性,可催化未官能化烯烃和 α,β-不饱和酮中 C=C 键的环氧化以及硫醚的磺化氧化。单体1比二聚体2更活跃。酸添加剂大大加速了氧化反应,并将氧化剂利用效率提高到>99%。产物分布表明异裂氧转移机制,该机制涉及在 Zr-POM 和 H 2 O 2相互作用时形成的亲电氧化物质。1和2与 H 2 O 2的相互作用以及由此产生的过氧衍生物已通过 UV-vis、FTIR、拉曼光谱、HR-ESI-MS 和组合 HPLC-ICP-原子发射光谱技术进行了研究。一个之间的相互作用17
Chinon-Amin-Reaktionen, 20. Mitt. 1,4-Naphthochinon-Derivate einiger Psychopharmaka mit sekundärer Aminstruktur
作者:Hans-Jörg Kallmayer、Christiane Tappe
DOI:10.1002/ardp.19863190708
日期:——
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PROCESS FOR THE SYNTHESIS OF AMINAPHTONE
申请人:LABORATORI BALDACCI SPA
公开号:US20140323747A1
公开(公告)日:2014-10-30
The present invention concerns a new process for the synthesis of aminaphtone, which makes use of non-toxic solvents and reagents, under mild reaction and temperature conditions. The aminaphtone obtained with the method of the present invention also has a purity of at least 98% in weight. The method comprises the following steps: a) epoxidating menadione 1 to provide epoxide 2, b) acidifying epoxide 2 to provide hydroxynaphthoquinone 3, c) esterifying between hydroxynaphthoquinone 3 and 4-aminobenzoyl chloride to obtain compound 4, and d) reducing compound 4 in the presence of a reducing agent in water to obtain aminaphtone.
Unprecedented Role of Hydronaphthoquinone Tautomers in Biosynthesis
作者:Syed Masood Husain、Michael A. Schätzle、Steffen Lüdeke、Michael Müller
DOI:10.1002/anie.201404560
日期:2014.9.8
unexpected 1,4‐diketo tautomeric form of 2‐hydroxyhydronaphthoquinone as a stable intermediate. Similar 1,4‐diketo tautomers of hydronaphthoquinones were established as products of the NADPH‐dependent enzymatic reduction of other 1,4‐naphthoquinones, and as substrates for different members of the superfamily of short‐chain dehydrogenases. We propose an essential role of hydroquinone diketo tautomers in
active (1.73 < IC50 < 18.11 μM). The naphtho[2,3-b]thiophene-4,9-dione analogs showed potent cytotoxicity, 8-hydroxy-2-(thiophen-2-ylcarbonyl)naphtho[2,3-b]thiophene-4,9-dione being the compound with the highest potency and selectivity. Our results suggest that the toxicity is improved in molecules with tricyclic naphtho[2,3-b]furan-4,9-dione and naphtho[2,3-b]thiophene-4,9-dione systems 2-substituted