环加成反应已被广泛研究,并为合成环状化合物提供了有效的策略。传统上,反应伙伴被广泛地掺入环状产物中而不会断裂。从不同的角度来看,如果在这种环加成反应中涉及通过化学键裂解的某些片段化,它将改变组装顺序并实现更多的产物多样性。在这里,我们报告通过部分或完全的NO自由基结合苯胺和炔烃的化学选择性亚硝基化。多个C–N键,意外的C–N键和N = O键断裂的形成使该片段性环加成反应成为2,5,2-二氢恶唑,1 H -1,2,3-三唑2-氧化物的有效方法或喹喔啉N-氧化物。在露天,无金属和温和条件下的简便操作使该协议特别实用且有吸引力。还进行了一系列的机理研究和密度泛函理论计算,这有助于解释零碎或完整的NO掺入过程,拓宽了新反应发现的领域。
Hypervalent iodine(<scp>iii</scp>)-promoted N-incorporation into N-aryl vinylogous carbamates to quinoxaline diesters: access to 1,4,5,8-tetraazaphenanthrene
作者:A. Sagar、Shinde Vidaycharan、Anand H. Shinde、Duddu S. Sharada
DOI:10.1039/c6ob00447d
日期:——
A novel oxidative N-incorporation strategy for synthesis of quinoxaline diesters under metal-free conditions is described for the first time. The mild reaction conditions allow for this transformation via the formation of two C(sp2)–N bonds utilizing cheaply available NaN3 as the N-atom source. N-Aryl vinylogous carbamates in this study undergo azidation at enamino C(sp2)–H selectively. The robustness
Exploring the Oxidative Cyclization of Substituted
<i>N</i>
‐Aryl Enamines: Pd‐Catalyzed Formation of Indoles from Anilines
作者:Julia J. Neumann、Souvik Rakshit、Thomas Dröge、Sebastian Würtz、Frank Glorius
DOI:10.1002/chem.201100631
日期:2011.6.20
The direct Pd‐catalyzed oxidative coupling of twoCH‐bonds within N‐aryl‐enamines 1 allows the efficient formation of differently substituted indoles 2. In this cross‐dehydrogenative coupling, many different functional groups are tolerated and the starting material N‐aryl‐enamines 1 can be easily prepared in one step from commercially available anilines. In addition, the whole sequence can also be
2,4-Bis(fluoroalkyl)quinoline-3-carboxylates as Tools for the Development of Potential Agrochemical Ingredients
作者:Fallia Aribi、Armen Panossian、Jean-Pierre Vors、Sergii Pazenok、Frédéric R. Leroux
DOI:10.1002/ejoc.201800375
日期:2018.8.1
scalable method for the synthesis of quinoline derivatives substituted by fluorinated groups at both the C‐2 and C‐4 positions developed in our laboratory, we have devised an approach to the synthesis of a new series of unprecedented 2,4‐bis(fluoroalkyl)quinoline‐3‐carboxylates in just two steps. After standard saponification, the latter gave the corresponding 2,4‐bis(fluoroalkyl)quinoline‐3‐carboxylic acids
A Convenient Route to 1-Alkyl-5-trifluoromethyl-1,2,3-triazole-4-carboxylic Acids Employing a Diazo Transfer Reaction
作者:Rustam T. Iminov、Alexander V. Mashkov、Bohdan A. Chalyk、Pavel K. Mykhailiuk、Anton V. Tverdokhlebov、Andrey A. Tolmachev、Yulian M. Volovenko、Oleg V. Shishkin、Svetlana V. Shishkina
DOI:10.1002/ejoc.201300030
日期:2013.5
The reaction of ethyl 3-(alkylamino)-4,4,4-trifluoro-but-2-enoates with mesyl azide in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) gave ethyl 1-alkyl-5-trifluoromethyl-1,2,3-triazole-4-carboxylates in good yields. Further hydrolysis of the ester group afforded the title compounds on a multigram scale.