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
Highly efficient one pot palladium-catalyzed synthesis of 3,5-bis (arylated) pyridines: Comparative experimental and DFT studies
作者:Muhammad Akram、Muhammad Adeel、Muhammad Khalid、Muhammad Nawaz Tahir、Hossein Asghar Rahnamaye Aliabad、Malik Aman Ullah、Javed Iqbal、Ataualpa A.C. Braga
DOI:10.1016/j.molstruc.2020.128131
日期:2020.8
Abstract Many different alkyl and aryl substituted pyridinebased organic derivatives have been synthesized due to its uniqueness pyridine core. However, the transition metal catalyzed Suzuki cross coupling reaction has provided an easy route to the synthesis of alkyl and aryl substituted pyridinebased organic compounds. Herein, we reported the arylated pyridinesderivatives: 3, 5-bis (4-(trifluoromethoxy)
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。