高碘化物(Ⅲ)作用下β-酮酸的脫酸反應(yīng)研究
[Abstract]:As a bionic synthesis reaction, catalytic decarboxylation has been extensively studied by organic synthetic chemists because of its advantages of environmental friendliness, mild reaction conditions and high reaction efficiency. The main substrates of this reaction are enolates, 尾 -ketoacids and their esters. At present, the studies on the catalytic decarboxylation of 尾 -ketoacid are mainly focused on the coupling reaction of decarboxylenol with nucleophilic reagents to electrophilic bodies. The catalysts for the reactions are mostly bifunctional organo-nonmetallic catalysts. For example, nickel, ytterbium and iridium also have applications. As a potential substitute for metal catalysts, periodate has similar reaction properties as metal catalysts. Compared with metal catalysts, it has the advantages of environmental friendliness and mild reaction. At present, the catalytic decarboxylation of 尾 -ketoacid under the action of periodate is less reported. The decarboxylation of 尾 -ketoic acid under the action of periodate was studied. The results are as follows: (1) decarboxylation of 尾 -ketoic acid was achieved. The optimum conditions of 尾 -ketoacid decarboxylation were obtained by optimizing the reaction conditions. Under the optimal conditions, the tolerance of the substrate to the reaction was investigated. It was found that the reaction could be carried out efficiently, whether it was electron-deficient aryl, electron-rich aryl, heterocyclic, aliphatic 尾 -ketoacid. At the same time, propionic acid, cyclohexanoic acid as a source of acyl oxygen, can also achieve the corresponding decarboxylation. Finally, the possible mechanism of the reaction was proposed through some verification experiments. (2) the decarboxylation of 尾 -ketoic acid was realized by using carbonyl 偽 -bromide as the intermediate of the reaction. The optimum reaction conditions were obtained by optimizing the reaction conditions. Under the optimal conditions, the tolerance of the substrates was investigated. It was found that the aryl, heterocyclic and naphthalene rings were both electron-rich and electron-deficient. Aliphatic and carbonyl 偽-methylated 尾-ketoacids are highly effective. Finally, on the basis of the mechanism verification experiment, the possible reaction mechanism was proposed. (3) Acyl-azide compounds were prepared by one-pot method from 尾 -ketoacid. The optimal reaction conditions were obtained by screening the conditions. Under the optimal conditions, the substrate was expanded, and it was found that the E-rich or electron-absorbing aryl 尾 -ketoacid could better realize the conversion to acyl-azide compounds, but the aliphatic 尾 -ketoacid could not be realized. This may be related to the low boiling point of aliphatic acyl azide compounds. Finally, the possible mechanism of the reaction was put forward by some mechanism verification experiments and some known literatures.
【學(xué)位授予單位】:西北農(nóng)林科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:O621.251
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