Selective metal-free amination and Diels-Alder reactions are described in the furan series, leading to polysubstituted anilines or to stable oxabicyclic adducts in high yield. Interestingly, anilines are conveniently prepared through a novel one-pot, two-step amination/Diels-Alder procedure from commercially available 5-bromo-2-furaldehyde.
Copper-Catalyzed Intermolecular Thioamination of Maleimides with Thiols and Formamides: A One-Step Construction of 3-Amino-4-thiomaleimides Using Formamides as Nitrogen Sources
Abstract A highly efficient copper-catalyzed intermolecular C(sp2)–H thioamination of maleimides with thiols and formamides in the presence of fluoroboric acid is reported using various readily available formamides as nitrogen sources and solvents. A diverse range of 3-amino-4-thiomaleimides is obtained with good yields under mild conditions, involving C–N and C–S bond formation. This methodology enriches
Three-Component Coupling Reactions of Maleimides, Thiols, and Amines: One-Step Construction of 3,4-Heteroatom-functionalized Maleimides by Copper-Catalyzed C(<i>sp</i>
<sup>2</sup>
)−H Thioamination
A copper‐catalyzed intermolecular thioamination of maleimides with thiols and amines has been developed. A diverse range of 3‐amino‐4‐thiomaleimides and 3,4‐dihydropyrrolo[3,4‐b][1,4]thiazine‐5,7(2H,6H)‐diones were obtained with good yields, involving C−N and C−S bond formations. This methodology is very practical and features high atom economy, excellent functional group tolerance.
已经开发了铜催化的马来酰亚胺分子内硫醇与硫醇和胺的氨基化反应。获得了各种3-氨基-4-硫代马来酰亚胺和3,4-二氢吡咯并[3,4- b ] [1,4]噻嗪-5,7(2 H,6 H)-二酮,收率高,涉及CN和CS键的形成。该方法非常实用,具有高原子经济性,出色的官能团耐受性。