Lewis Acid Catalyzed Indole Synthesis via Intramolecular Nucleophilic Attack of Phenyldiazoacetates to Iminium Ions
摘要:
Lewis acids catalyze the cyclization of methyl phenyldiazoacetates with an ortho-imino group, prepared from o-aminophenylacetic acid, to give 2,3-substituted indoles in quantitative yields.
Copper-Catalyzed Synthesis of 2,3-Disubstituted Indoles
作者:Shinji Tanimori、Haruna Ura、Mitsunori Kirihata
DOI:10.1002/ejoc.200700428
日期:2007.8
one-step synthesis of 2,3-disubstitutedindoles from readily available starting materials, 2-iodoaniline and various β-keto esters was described. The advantage of this method is the use of cheap catalysts and simple experimental procedures undermild reaction conditions. As the substituted indole derivatives are important starting materials for the synthesis of biologically active indole alkaloids
This paper reports our recent results from synthesis of some useful heterocycles, for example oxazolidinones, indoles, and quinoxalinones, by transition metal-catalyzed cascade processes. The scope and limitations of these procedures and the reaction mechanism for formation of the heterocycles are also discussed.
Facile Access to Polysubstituted Indoles via a Cascade Cu-Catalyzed Arylation−Condensation Process
作者:Yu Chen、Xiaoan Xie、Dawei Ma
DOI:10.1021/jo702059q
日期:2007.11.1
hydrolysis delivered 2,3-disubstituted indoles. The halides bearing a strong electron-withdrawing group in the 4-position can undergo in situ basic hydrolysis to provide the corresponding indoles. Polysubstituted indoles can be prepared from substituted 2-halotrifluoroacetanilides with high regioselectivity.
CuI / l-脯氨酸催化的2-卤代三氟乙酰苯胺与β-酮酯和酰胺的交叉偶联,然后进行原位酸性水解,生成了2,3-二取代的吲哚。在4-位带有强吸电子基团的卤化物可进行原位碱性水解以提供相应的吲哚。可以由具有高区域选择性的取代的2-卤代三氟乙酰苯胺制备多取代的吲哚。
A Synthesis of Benzothiazoles and Indoles by Direct C(sp2)–I Activation Catalyzed by Copper(II) on Silica-Coated Magnetite Nanoparticles
N -Substituted 2-amino-1,3-benzothiazoles and 2,3-disubstituted indoles were prepared by C–S and C–C cross-coupling reactions of 2-iodoanilines with isothiocyanates or 1,3-dicarbonyl compounds, respectively, in the presence of magnetic nanoparticles functionalized with a copper(II)–Schiff base complex as an efficient and reusable catalyst.
Lewis Acid Catalyzed Indole Synthesis via Intramolecular Nucleophilic Attack of Phenyldiazoacetates to Iminium Ions
作者:Lei Zhou、Michael P. Doyle
DOI:10.1021/jo902089e
日期:2009.12.4
Lewis acids catalyze the cyclization of methyl phenyldiazoacetates with an ortho-imino group, prepared from o-aminophenylacetic acid, to give 2,3-substituted indoles in quantitative yields.