A highly selectivecopper-catalyzed concise synthesis of 3,5-diarylpyridine and 2-(1H)-pyridone has been achieved through cascade Chichibabin-type cyclization, C(sp3)–C(sp3) cleavage, and aerobicoxidation. Azide, ceric ammonium nitrate (CAN), and 2-aminopyridine are disclosed as efficient nitrogen donors in this Cu-catalysis using O2 as the oxidant. Water and molecular oxygen were employed as the
bond participation in annulation to pyridines usingN,N-dimethylformamide (DMF) as the N1 and C4 synthons has been carried out. In this reaction, DMF contributed one N atom and one C atom to two disconnected positions of pyridine ring, with no need for an additional nitrogen source. Two C═C bonds in two molecules of substituted styrenes offered four carbon atoms in the presence of iodine and persulfate
of Cs2CO3, the first simple, efficient, and one-pot procedure for the synthesis of 3,5-diaryl pyridines via a variety of aromatic terminal alkynes with benzamides as the nitrogen source in sulfolane is described. The formation of pyridine derivatives accompanies the outcome of 1,3-diaryl propenes, which are also useful intermediates in organic synthesis. Thus, pyridine ring results from a formal [2+2+1+1]
在 Cs 2 CO 3的存在下,描述了第一个简单、有效和一锅法合成 3,5-二芳基吡啶的方法,该方法通过各种芳族末端炔烃以苯甲酰胺作为环丁砜中的氮源。吡啶衍生物的形成伴随着 1,3-二芳基丙烯的生成,这也是有机合成中有用的中间体。因此,吡啶环源自三个炔烃与苯甲酰胺的正式 [2+2+1+1] 环缩合反应,其中一个炔烃提供一个碳,而苯甲酰胺仅提供氮源。在这项工作中发现了炔烃的新转化以及苯甲酰胺的新用途。