We have achieved a rare‐metal‐free photo‐aerobic intramolecular dehydrogenative couplingreaction from two C—H bonds of indole with malonate. This catalytic system proceeded at room temperature under visible light irradiation with oxygen in the air as a terminal oxidant, and the cyclization products were obtained in good to excellent yields.
Radical-Mediated Dearomatization of Indoles with Sulfinate Reagents for the Synthesis of Fluorinated Spirocyclic Indolines
作者:Dmytro Ryzhakov、Maxime Jarret、Régis Guillot、Cyrille Kouklovsky、Guillaume Vincent
DOI:10.1021/acs.orglett.7b03155
日期:2017.12.1
introduction of trifluoromethyl and 1,1-difluoroethyl radicals, generated from their corresponding sulfinate salts, into the C2 position of indole derivatives allows the diastereoselective synthesis of three-dimensional 3,3-spirocyclic indolines over C–H functionalized indoles.
A Simple and Broadly Applicable C−N Bond Forming Dearomatization Protocol Enabled by Bifunctional Amino Reagents
作者:Xiaofeng Ma、Joshua J. Farndon、Tom A. Young、Natalie Fey、John F. Bower
DOI:10.1002/anie.201708176
日期:2017.11.13
A C-Nbondformingdearomatizationprotocol with broad scope is outlined. Specifically, bifunctionalaminoreagents are used for sequential nucleophilic and electrophilic C-Nbond formations, with the latter effecting the key dearomatization step. Using this approach, γ-arylated alcohols are converted to a wide range of differentially protected spirocyclic pyrrolidines in just two or three steps.
Antimony (III) Sulfate Catalyzed One-Pot Synthesis of 2,3-Disubstitutedindoles
作者:A. Srinivasa、K. M. Mahadevan、P. Prabhakara Varma、A. Sudhakara
DOI:10.1080/10426500802388250
日期:2009.7.13
using antimony (III) sulfate as the catalyst. Good yields were obtained after reacting phenylhydrazines hydrochlorides and ketones in refluxing methanol. The exclusive formation of 2,3- disubstituted indoles was observed in the reaction of ethyl methyl ketone with phenylhydrazines. One-pot synthesis of indole-3-propanol using dihydropyran has also been described. The use of reusable antimony (III)
A General Synthesis of Substituted Indoles from Cyclic Enol Ethers and Enol Lactones
作者:Kevin R. Campos、Jacqueline C. S. Woo、Sandra Lee、Richard D. Tillyer
DOI:10.1021/ol036113f
日期:2004.1.1
[reaction: see text] X = CH2, C[double bond]O, R2 = H, alkyl. A general method was developed for the one-pot synthesis of highly functionalized indoles from simple, commercially available aryl hydrazines and cyclicenolethers. Enol lactones were also used as substrates, affording substituted indole acetic acid or indole propionic acid derivatives. This procedure affords 2,3-disubstituted indoles as
[反应:见正文] X = CH 2,C [双键] O,R 2 = H,烷基。已开发了一种通用方法,用于从简单的市售芳基肼和环状烯醇醚一锅合成高官能化的吲哚。烯醇内酯也用作底物,提供取代的吲哚乙酸或吲哚丙酸衍生物。该方法由适当取代的烯醇醚或烯醇内酯得到2,3-二取代的吲哚,作为单一的区域异构体。该方法在抗偏头痛药物舒马曲坦和消炎药消炎痛的有效合成中得到了强调。