碳酸鉀參與肟類化合物氮—氧鍵斷裂重排合成吡啶酚的反應(yīng)研究
[Abstract]:Rearrangement reaction is not only an important tool to construct new carbon-carbon bond and carbon-heterogeneity bond, but also plays an important role in the field of organic synthesis, especially in the synthesis of complex products from simple raw materials. These reactions are widely used in the synthesis of organic fine chemicals, drug synthesis and pesticide chemistry. In addition to the well-known carbon-carbon bond breaking rearrangements such as the Clayson reaction, the nitrogen-oxygen bond break-rearrangement also plays an important role in the synthesis of polysubstituted furans, pyridine and pyrrole, and other heterocyclic compounds with special applications. However, compared with carbon-carbon bond fracture rearrangement, nitrogen-oxygen bond fracture rearrangement is less reported and mostly confined to such problems as harsh reaction conditions, narrow substrate range, low yield and low selectivity. In addition, these reactions are often used in transition metals or solvents with high toxicity, which have negative effects on economy and environment. Therefore, it is very important to develop a kind of nitrogen-oxygen bond breaking rearrangement reaction with mild conditions, good functional tolerance and valuable product structure for the study of rearrangement reaction and the development of organic synthesis methodology. In this paper, the rearrangement of nitrogen-oxygen bond and the related reactions are discussed. Furthermore, based on the interest of our team in the conversion of oxime compounds and the development of novel, simple and environmentally friendly nitrogen-oxygen bond breaking rearrangement reaction, a new cyclization and rearrangement method for the synthesis of pyridinol from 緯, 未 -alkynyl oxime compounds is reported. Through the affinity addition cyclization of oxime and the nitrogen-oxygen bond breaking process, 3-pyridinol, which is mainly dependent on the existing pyridine skeleton structure, was obtained. There is no transition metal catalyst and oxidant in the reaction process, and no strong alkali is used to initiate the nucleophilic reaction, only potassium carbonate can be added. The reaction has the advantages of high tolerance of functional groups, wide substrate range, good atomic economy and mild conditions. The use of glycerol as solvent makes the reaction have the advantages of low cost, low toxicity and environmental friendliness.
【學(xué)位授予單位】:西北大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:O626
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