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Copper-catalyzed N-alkylation of indoles by N-tosylhydrazones
作者:Li Ling、Jing Cao、Jianfeng Hu、Hao Zhang
DOI:10.1039/c7ra03765a
日期:——
An efficient method for the direct N-alkylation of indoles via copper-catalyzed reductive cross coupling between N-tosylhydrazones and indole reagents has been developed. The reaction was performed in the presence of copper iodide and potassium hydroxide by utilization of tri(p-tolyl)phosphine as a ligand. A wide variety of N-alkylated indoles were obtained in moderate to good yields. The application
Visible-Light Sensitization of Vinyl Azides by Transition-Metal Photocatalysis
作者:Elliot P. Farney、Tehshik P. Yoon
DOI:10.1002/anie.201308820
日期:2014.1.13
Irradiation of vinyl and aryl azides with visible light in the presence of Ru photocatalysts results in the formation of reactive nitrenes, which can undergo a variety of CN bond‐forming reactions. The ability to use low‐energy visible light instead of UV in the photochemical activation of azides avoids competitive photodecomposition processes that have long been a significant limitation on the synthetic
在 Ru 光催化剂存在下用可见光照射乙烯基和芳基叠氮化物会导致反应性氮烯的形成,氮烯可以进行各种 C N 键形成反应。在叠氮化物的光化学活化中使用低能可见光代替紫外线的能力避免了竞争性光分解过程,而竞争性光分解过程长期以来一直是这些反应合成应用的重大限制。
Cascade Reaction of 2-Naphthols and Azirines: One-Pot Synthesis of C-3 Naphthol-Substituted Benzo[<i>e</i>]indoles
A copper-catalyzed annulation of 3-aryl-2H-azirines with 2-naphthols has been developed for the rapid assembly of C-3-naphthol-substituted benzo[e]indoles in one pot. This cascade reaction was realized through dearomatic nucleophilic ring opening of azirine, intramolecularcyclization, and oxidative cross-dehydrogenative coupling to furnish the important unreported π-expanded naphthol/benzo[e]indole
已开发出铜催化的 3-芳基-2 H-氮杂环与 2-萘酚环化,用于在一个锅中快速组装 C-3-萘酚取代的苯并 [ e ] 吲哚。这种级联反应是通过氮丙啶的脱芳亲核开环、分子内环化和氧化交叉脱氢偶联来实现的,以提供重要的未报道的 π 扩展萘酚/苯并 [ e ] 吲哚联芳基化合物。
A synthetic route towards 3,4-disubstituted pyrrolidin-2-ones via a Michael addition and reductive ring closing strategy
Pyrrolidin-2-one derivatives were synthesized via DABCO mediated Michael addition of isoxazol-5(4H)-ones with nitroalkenes, followed by one pot reduction of the nitro group and ring cleavage with cyclization. 2-Pyrrolidinone scaffolds with a wide range of substituents were synthesized with good yield and diastereoselectivity by using this protocol.