可見光誘導(dǎo)酚類化合物的官能團(tuán)化研究
[Abstract]:One of the key objectives in the field of catalysis is the development of a new method of activating inert small molecules, which improves the utilization ratio of resources and energy and the synthesis efficiency of the target product in the reaction process by a new bonding mode. In the past decade, the revival of free-radical chemistry in the field of organic synthesis has also raised the researchers' interest in photochemistry. A special open-shell reactive intermediate can be produced during the photocatalytic reaction, which is difficult or even impossible to obtain under the influence of other catalysts. In addition, that light has the essential attribute of large reserves, green environment protection and renewable energy, which make the photocatalytic method accord with the requirements of the era of safety, environmental protection and green and high efficiency advocated by the modern organic chemistry. The phenolic compounds and their derivatives are a kind of very important medical intermediate and chemical raw material. Bromophenol is a common organic synthesis intermediate and plays an important role in the fields of material, medicine and pesticide. The benzo-phenylene skeleton compound which is directly synthesized by the phenolic substance has the potential biological activity, and can show various physiological functions such as anti-inflammation, anti-oxidation and anti-cancer. The benzo-VA-(1) ketone compound, which is constructed with o-aminophenol or alcohol as a raw material, has important significance in the fields of biology, medicine and pesticide, for example, the anti-AIDS drug according to the law contains the characteristic structure. In this paper, phenolic compounds are used as a central reaction substrate, and various functional groups of the phenolic compounds under normal pressure and normal pressure are studied through visible light induction, such as bromination,[3 + 2] ring addition, esterification/ deamination and direct amination. The bromination of phenolic compounds was carried out under visible light-induced conditions by using tetrabromized carbon as an oxidation-quenching agent and a bromine source, and using Ru (bpy) _ 3Cl _ 2 as a photocatalyst. The bromophenol product is considered to be the bromine simple substance generated by the in-situ oxidation of the bromide anion and the phenol are electrophilic addition. And the olefin can also generate the corresponding double bond by the bromine addition product under the same condition, which further proves the generation of the bromine simple substance in the reaction process. The method adopts the solid-state tetrabromocarbon as a bromine source, avoids the high-toxicity liquid bromine used in the conventional synthesis method, and studies a more green and environment-friendly, energy-saving and high-efficiency bromination method. using sodium persulfate as the oxidizing agent, the[3 + 2] cycloaddition reaction between the phenol and the olefin class is realized under the condition of visible light induction or heating, and a series of dihydro-benzene and the sulfur-containing compounds are obtained at a good yield, The natural product, Corsifanan A. S _ 2O _ 8 ~ (2-), was decomposed into a strong oxidizing SO2-4 ~ (路-) under the condition of light or heating, and the substrate phenol can be oxidized into phenol-oxygen free radicals to carry out the[3 + 2] cycloaddition reaction with the olefin. Compared with the severe conditions of strong acid and heavy metal used in the traditional synthesis method, the method provides a more gentle environment-friendly and economic energy-saving way. Under the condition of visible light catalysis, a series of five-membered ring or six-membered ring of benzene is synthesized by using Ru (bpy) _ 3Cl _ 2 as a photocatalyst, and a series of five-membered ring or six-membered ring-containing benzo-VA-(1) ketone compound is synthesized. And the tribromocarbon free radicals generated after the tetrabrominating carbon is involved in the oxidation quenching are directly involved in the formation of the carbon atoms in the reaction product. And the continuous flow process is adopted to realize the expansion reaction and the recovery and utilization of the photocatalyst. The synthesis method is characterized in that the carbon source in the product is derived from two different components, namely, the carbon is derived from the carbon tetrabromide and the oxygen is derived from water, and the production of highly toxic raw materials such as phosgene and the like, such as phosgene, and the like, which is used in the conventional synthesis method, is avoided. By using potassium persulfate as the oxidizing agent, the direct cross-dehydrogenation amination of the phenolic compound and the heterocyclic diphenylamine compound is realized under the condition of visible light irradiation to synthesize the reaction of the cyclic triphenylamine. The synthesis method does not need any catalyst, the reaction conditions are simple and mild, the reaction yield is high, and the chemical selectivity of the product is single. Most importantly, the method avoids the advance activation of the substrate, and generates a new carbon-nitrogen bond in a manner that the two-molecule substrate is dehydrogenated and coupled directly. The synthesis process of non-cyclic triphenylamine is further studied on the basis of the preliminary work. The direct cross-dehydrogenation amination of the phenolic compound and the non-cyclic dianiline compound under simple and mild conditions is realized under the action of the organic photocatalyst 2,4,6-triphenylamine salt, and a series of non-cyclic triphenylamine monomers are synthesized. The reaction mechanism of the double-radical cross-coupling was deduced by the fluorescence quenching experiment and the EPR test. Furthermore, by calculating the quantum yield of the reaction, there is a basic determination of the free radical chain-increasing process in the reaction. The method innovatively widens the application range of the substrate and avoids the conditions of high temperature, metal catalysis and advance activation of the reaction substrate required in the conventional amination coupling method. Both types of amination reactions are based on the free-radical cross-coupling of the free radical of the phenol and the free radicals generated by the oxidation.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:O621.251
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