Copper-Catalyzed Domino Synthesis of 2-Imino-1<i>H</i>-imidazol-5(2<i>H</i>)-ones and Quinoxalines Involving CC Bond Cleavage with a 1,3-Dicarbonyl Unit as a Leaving Group
作者:Yan Yang、Fan Ni、Wen-Ming Shu、An-Xin Wu
DOI:10.1002/chem.201403001
日期:2014.9.8
The domino sequence for the synthesis of 2‐imino‐1H‐imidazol‐5(2H)‐ones includes aza‐Michael addition, intramolecular cyclization, CCbond‐cleavage, 1,2‐rearrangement, and aerobic dehydrogenation reaction, whereas the domino sequence for the synthesis of quinoxalines includes aza‐Michael addition, intramolecular cyclization, elimination reaction, and CCbond‐cleavage reaction. The two domino reactions
Formation of Unsymmetrical 1,4-Enediones via A Focusing Domino Strategy: Cross-Coupling of 1,3-Dicarbonyl Compounds and Methyl Ketones or Terminal Aryl Alkenes
A highly efficient synthesis of unsymmetrical 1,4-enediones from 1,3-dicarbonyl compounds and methyl ketones or terminalarylalkenes has been developed via a focusing domino strategy. Simple and readily available starting materials, mild reaction conditions, and a very simple operation are advantages of the reaction, which allow straightforward synthesis of a variety of unsymmetrical 1,4-enediones
I<sub>2</sub>/Cu-mediated self-sorting domino reaction of aryl β-ketoesters into symmetrical 2-carboalkoxy-1,4-enediones: application to synthesis of pyrazine, β-carboline and quinoxalines
作者:Gandhesiri Satish、Andivelu Ilangovan
DOI:10.1039/c5ra08030d
日期:——
A self-sorting domino reaction of aryl β-ketoesters into symmetrical 1,4-enediones is reported by an I2/Cu system.
一种I2/Cu体系报告的芳基β-酮酯的自排序多米诺反应可将其转化为对称的1,4-烯二酮。
Organocatalytic enantioselective conjugate addition of pyrazolin-5-ones to arylomethylidene malonates
An efficient asymmetric organocatalytic conjugate addition reaction of pyrazolin-5-ones with arylomethylidene malonates has been successfully developed by employing bifunctional Cinchona derived thiourea organocatalysts. The protocol provides straightforward access to pyrazole substituted scaffolds in good yields with high stereocontrol.
Unsymmetrical 1,1,2-triacylalkenes were conveniently prepared by the oxidative coupling of 1,3-keto esters with terminal alkynes by employing 4.0 equivalents of inexpensive cericammoniumnitrate (CAN) as the oxidant in acetonitrile as the solvent at 0 °C. The method is milder than previously reported methods and can be conducted under air, thereby demonstrating its practicality and versatility for
不对称的 1,1,2-三酰基烯烃是通过 1,3-酮酯与末端炔烃的氧化偶联,在 0 °C 下使用 4.0 当量廉价的硝酸铈铵 (CAN) 作为氧化剂,以乙腈为溶剂,方便地制备的。该方法比以前报道的方法更温和,并且可以在空气中进行,从而证明了它在制备这些有用的构件方面的实用性和多功能性。该反应被认为是通过由 CAN 引发的 1,3-酮酯底物的单电子转移过程发生的,以产生 α-自由基物质,该物质迅速添加到反应中的末端炔烃伴侣。随后通过空气和 CAN 对所得乙烯基自由基进行氧化,然后导致形成作为 E 和 Z 异构体混合物的三酰基烯烃产物。反应被证明是一般的,