The Synthesis and Application of 2-Cyano and -Ester Containing Anilines: Selective Copper-Catalyzed Reductive Amination, N-Benzylation, and Cyclization Reactions
2-ester anilines is described via efficient and selective copper(II)-catalyzed reductive amination via hydrosilylation process. Both 2-cyano and 2-ester anilines were successfully synthesized with good functional group tolerance and high selectivity. The application of the 2-cyano and -iodine containing anilines was developed in the synthesis of indoloindole derivativesvia CuSO4-catalyzed N-benzylation
通过高效和选择性的铜 (II) 催化还原胺化,通过氢化硅烷化过程描述了一种方便实用的 2-氰基和 2-酯苯胺途径。成功合成了具有良好官能团耐受性和高选择性的2-氰基苯胺和2-酯苯胺。通过CuSO 4催化的N-苄基化和“一锅”环化反应,开发了含2-氰基和-碘苯胺在吲哚吲哚衍生物的合成中的应用。更有趣的是,这些含 2-氰基和 2-酯的苯胺的光物理性质研究显示出优异的荧光性质,在不久的将来在开发有趣的近紫外光学器件方面具有巨大的应用潜力。
Diastereoselective Synthesis of 4-Hydroxy-2-quinolinones via Formal [2 + 4] Cycloaddition Reactions Using α-Diazo Pyrazoleamides as C2 Synthons
A rhodium-catalyzed highly stereoselective formal [2 + 4]-cycloaddition reaction of α-diazo pyrazoleamides and 2-aminophenyl ketones that produces 4-hydroxy-2-quinolinones in good yields with excellent diastereoselectivities has been developed. A pyrazolium ylide species that is generated from α-diazo pyrazoleamides is used as a C2 synthon for this cycloaddition. This protocol offers an efficient approach
The cyanoamidation of olefins was achieved. When N-(2-vinylphenyl)cyanoformamides were treated with palladium catalyst, intramolecular cyanoamidation took place to give corresponding 3,3-disubstituted oxindoles. P(t-Bu)(3) showed a remarkable effect on this reaction. When it was used with Pd(dba)(2), the reaction was completed in 15 min at 100 degrees C for many substrates. Furthermore, the enantioselective cyanoamidation was accomplished with Pd(dba)(2) and an optically active phosphoramidite to provide optically active 3,3-disubstituted oxindoles. Manipulation of the resulting oxindoles has been studied. (C) 2010 Elsevier Ltd. All rights reserved.