高價碘介導的芳基偶聯(lián)及重排反應:一種合成聯(lián)芳基化合物的新方法
[Abstract]:Diaryl compounds are important structural units, which have been found in some natural products with pharmacological activities, and also have important applications in organic reactions. In recent years, direct dehydrogenation of two aromatic rings has become a new strategy for the construction of biaryl compounds. This method has many advantages, such as atomic economy and green environmental protection, so it has attracted much attention of organic chemistry researchers. Most of the existing methods require transition metals, and there are some problems such as substrate limitation and high reaction temperature. In this paper, a method for preparing biaryl compounds by dehydrogenation coupling and rearrangement mediated by high valence iodine reagents is introduced. The reaction includes the following characteristics: 1) the formation of the bond between aromatic ring C (sp2) and aromatic ring C (sp2); 2) the cleavage of aromatic ring C (sp2) with amide C (O) bond, 3) lactam or internal esterification. A total of 21 biaryl compounds with potential pharmacological activities were prepared by reflux reaction in acetonitrile with 2-aminobenzamide (119) as substrate and PIDA (diacetyl iodobenzene) as oxidant. Using 2-hydroxybenzoamide compound 132 as substrate, dichloromethane as solvent, under the action of PIFA/BF3 OEt2 (bisfluoroacetyl iodiobenzene / boron trifluoride ether), Seventeen diaryl compounds with new structure were prepared by one pot method. All the products were characterized by hydrogen spectrum, carbon spectrum, IR and MS, and the structure of product 121a was confirmed by single crystal diffraction. At the same time, the possible mechanism of the rearrangement reaction was proposed, and the discovery of intermediate 134 and some experimental facts proved the rationality of the mechanism. In addition, we also explored the application of the product. By hydrolysis of some of the products, we obtained the asymmetric structure with amino, hydroxyl functional groups of the biaryl compounds.
【學位授予單位】:天津大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:R914.5
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