Microwave-assisted synthesis of 3-substituted indoles via intramolecular arene–alkene coupling of o-iodoanilino enamines
摘要:
A generally applicable and high-yielding protocol for the synthesis of 3-substituted indole derivatives is described. Key features include microwave-assisted intramolecular arene alkene coupling of o-iodoanilino enamines, and expedient synthesis of o-iodoanilino enamine substrates employing N,O-acetal TMS ethers, which could be conveniently derived from the corresponding amides. Our unique procedure seems quite efficient and provides an easy access to a variety of 3-substituted indoles as privileged structure for a wide range of biological targets. (C) 2013 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of spirocyclic oxindoles based on a one-pot Ullmann coupling/Claisen rearrangement and its application to the synthesis of a hexahydropyrrolo[2,3-b]indole alkaloid
efficient and convenient approach to the synthesis of spirocyclicoxindoles from iodoindoles has been developed. The most striking feature of this approach is that the sequential intramolecular Ullmann coupling and Claisen rearrangement proceeds in a one-pot manner to afford 3-spiro-2-oxindoles in good yield with excellent diastereoselectivity. Application of this one-pot reaction to chiral non-racemic
A dramatic enhancing effect of InBr3 was observed towards the oxidative Sonogashira cross-coupling reaction of 2-ethynylaniline with (E)-trimethyl(3,3,3-trifluoroprop-1-enyl)silane.
Metal-Free Synthesis of Fluorinated Indoles Enabled by Oxidative Dearomatization
作者:Edon Vitaku、David T. Smith、Jon T. Njardarson
DOI:10.1002/anie.201511149
日期:2016.2.5
fluorinated drugs is increasing each decade. Therefore, new approaches for accessing fluorinated nitrogen heterocycles are of great significance. A novel, scalable, and metal‐free method for accessing a wide range of fluorinated indoles is described. This oxidative‐dearomatization‐enabled approach assembles 2‐trifluoromethyl NH‐indole products fromsimple commercially available anilines with hexafluoroacetylacetone
Synthesis of 2-Quinolones via Palladium-Catalyzed Carbonylative Annulation of Internal Alkynes by <i>N</i>-Substituted <i>o</i>-Iodoanilines
作者:Dmitry V. Kadnikov、Richard C. Larock
DOI:10.1021/jo049149+
日期:2004.10.1
The palladium-catalyzed annulation of internal alkynes by N-substituted o-iodoanilines under 1 atm of carbonmonoxide results in the formation of 3,4-disubstituted 2-quinolones. The nature of the substituent on the nitrogen is crucial to obtaining high yields of 2-quinolones. The best results are obtained using alkoxycarbonyl, p-tolylsulfonyl, and trifluoroacetyl substituents. The nitrogen substituent
Access to Benzo[<i>a</i>]carbazoles and Indeno[1,2-<i>c</i>]quinolines by a Gold(I)-Catalyzed Tunable Domino Cyclization of Difunctional 1,2-Diphenylethynes
The cyclization order of the difunctional 1,2-diphenylethynes was precisely tuned under the catalysis of gold by changing the nitrogen substitution of the substrates, leading to the facile preparation of benzo[a]carbazole and indeno[1,2-c]quinolinederivatives. The mechanisms of these domino cyclizations were probed by control experiments, and an insight into the selectivity of the cyclization was
通过改变底物的氮取代,在金的催化下精确调节了双官能1,2-二苯乙炔的环化顺序,从而轻松制备了苯并[ a ]咔唑和茚并[1,2- c ]喹啉衍生物。通过控制实验探索了这些多米诺环化的机理,并通过密度泛函理论(DFT)计算获得了对环化选择性的深入了解。这项研究代表了访问苯并[ a ]咔唑和茚并[1,2- c ]喹啉的统一而通用的方法。