Synthesis of Imidazolidinone, Imidazolone, and Benzimidazolone Derivatives through Oxidation Using Copper and Air
作者:Dazhi Li、Thierry Ollevier
DOI:10.1021/acs.orglett.9b00973
日期:2019.5.17
synthetic method of urea derivativesusing copper and air was developed. These mild conditions provided moderate to very good yields for 15 examples (53–93%), while low yields were obtained with sterically hindered substrates (3 examples). The reaction was found to go through an in situ generated copper–N-heterocyclic carbene, which was then oxidized into cyclic urea derivatives possessing alkyl, benzyl
The structures of diiodosamarium(II) complexes with amide compounds have been investigated basing on single crystalX-ray structural analyses. The reaction of [SmI2(thf)2] with 2 equivalents of tetramethylurea (TMU) gave [SmI2(thf)2(tmu)2] (1). The three different kinds of ligands in 1 attach to the samarium atom in a trans orientation. [SmI2(thf)2] reacted with 4 equivalents of 1,3-dimethyl-2-imidazolidione
Mechanism studies of oxidation and hydrolysis of Cu(I)–NHC and Ag–NHC in solution under air
作者:Dazhi Li、Thierry Ollevier
DOI:10.1016/j.jorganchem.2019.121025
日期:2020.1
The decomposition of copper(I)–NHC and silver-NHC complexes in solution under air was studied. The Cu(I)–NHCs were oxidized into urea derivatives and hydrolysed into imidazoliums or benzimidazoliums. The decomposition of Ag–NHC with a saturated backbone led to ring-opening product, while the Ag–NHC with an unsaturated backbone led to imidazolium and Ag-bisNHC complex. The effects of steric property
Metal-free C(sp<sup>2</sup>)–H functionalization of azoles: K<sub>2</sub>CO<sub>3</sub>/I<sub>2</sub>-mediated oxidation, imination, and amination
作者:Ranajit Das、Mainak Banerjee、Rakesh Kumar Rai、Ramesh Karri、Gouriprasanna Roy
DOI:10.1039/c8ob00535d
日期:——
available simple K2CO3/I2 reagent combination. The iodinated azole adduct, produced via the in situ generation of N-heterocyclic carbene, is the key intermediate for C2−H oxidation, imination, and amination of azoles. Significantly, these reactions proceed under mild conditions with high to excellent yields, are scalable to large quantity and exhibit a broad substrate scope. Interestingly, this direct
通过使用可商购的简单K 2 CO 3 / I 2试剂组合,可以实现多种唑类的直接C2-H氧化和亚胺化。碘化唑加成物,产生通过所述原位生成N-杂环碳烯的,为C2-H氧化,亚胺化,和唑类的胺化的关键中间体。重要的是,这些反应在温和的条件下以高至优异的产率进行,可扩展至大量并显示出广泛的底物范围。有趣的是,这种直接的C2-H胺化方法使我们能够获得各种具有药理活性的N 6-烷基或N 6芳基取代的苯并咪唑并喹唑啉酮骨架通过分子内CH串联进行一锅反应。
Ruthenium complex-catalysed synthesis of 1,3-disubstituted 2,3-dihydroimidazol-2-ones from N,N′-disubstituted ureas and vicinal diols
Various 1,3-disubstituted 2,3-dihydroimidazol-2-ones are readily prepared by the reaction of N,Nâ²-disubstituted ureas with vicinal-diols in the presence of a catalytic amount of ruthenium complex in fair to good yields.