Enantioselective Synthesis of Tryptophan Derivatives by a Tandem Friedel–Crafts Conjugate Addition/Asymmetric Protonation Reaction
作者:Madeleine E. Kieffer、Lindsay M. Repka、Sarah E. Reisman
DOI:10.1021/ja209390d
日期:2012.3.21
tandem Friedel-Crafts conjugate addition/asymmetric protonation reaction between 2-substituted indoles and methyl 2-acetamidoacrylate is reported. The reaction is catalyzed by (R)-3,3'-dibromo-BINOL in the presence of stoichiometric SnCl(4), and is the first example of a tandem conjugate addition/asymmetric protonation reaction using a BINOL·SnCl(4) complex as the catalyst. A range of indoles furnished
Potassium persulfate mediated oxidative dearomatization and C–H functionalization of indoles in water: Green and transition metal free approach for the synthesis of indolone derivatives
作者:Ballanki Trinadh、Baby Viswambharan
DOI:10.1016/j.tet.2023.133527
日期:2023.8
metal-free “Greener Approach” for the synthesis of 2-(1H-indol-3-yl)-2,3’- bisindolin-3-one derivatives using K2S2O8 as an eco-friendly oxidant in water is described for electron rich and deficient indoles. Reactions in water and acetonitrile are done for confirming the intermediate and yield. The reaction proceeds through a radical pathway, confirmed by EPR, with C3 oxidativedearomatization followed by trimerization
一种操作简单、不含过渡金属的“绿色方法” ,使用 K 2 S 2 O 8作为生态合成 2-(1H-indol-3-yl)-2,3'- bisindolin -3-one 衍生物描述了富电子和缺电子吲哚在水中的友好氧化剂。在水和乙腈中进行反应以确认中间体和产率。该反应通过 EPR 证实的自由基途径进行,先进行 C3 氧化脱芳构化,然后进行三聚化。对选定的具有供体-受体官能团的化合物进行了初步光物理研究。
Visible-Light-Promoted Cascade Carboxylation/Arylation of Unactivated Alkenes with CO2 for the Synthesis of Carboxylated Indole-Fused Heterocycles
作者:Han Yang、Qi Yang、Yang Yao、Peiyang Gu、Jianwei Sun、Song Sun
DOI:10.1021/acs.orglett.4c01967
日期:2024.8.2
carboxylation/arylation of indole-tethered unactivated alkenes with CO2 to access various carboxylated indole-fused heterocycles. This reaction is initiated by the addition of a CO2 radical anion to the alkene motif toward an alkyl carbon radical, followed by its addition to the aromatic ring, and then rearomatization to afford the final products. This reaction provides a facile and sustainable protocol for
AbstractThe Brønsted acid‐mediated alkylation and alkenylation of indoles were efficiently achieved by means of 3‐(dimethylamino)acrylonitrile. Regulating the acidity of the reaction medium with para‐toluenesulfonic acid monohydrate (p‐TsOH⋅H2O) and/or acetic acid (HOAc) led to versatile formation of 3‐alkylated and 3‐alkenylated indole derivatives under mild conditions. The 3‐alkylated indole products could be nearly quantitatively transformed to the corresponding separable (E)‐ and (Z)‐3‐alkenylated indoles.magnified image