Kinetic Resolution of Tertiary Alcohols: Highly Enantioselective Access to 3-Hydroxy-3-Substituted Oxindoles
作者:Shenci Lu、Si Bei Poh、Woon-Yew Siau、Yu Zhao
DOI:10.1002/anie.201209043
日期:2013.2.4
Enantioselective: The first highlyenantioselectivekineticresolution of 3‐hydroxy‐3‐substituted oxindoles has been developed through oxidative esterification catalyzed by a N‐heterocyclic carbene (see picture). This method uses a simple procedure and provides 3‐hydroxy‐oxindoles with various substituents at the 3‐position in excellent enantiopurity. S=selectivity.
Applications of Ytterbium(II) Reagent as Grignard Reagent and Single-Electron Transfer Reagent in the Synthesis of 3-Substituted 2-Oxindoles
作者:Songlin Zhang、Pengkai Wang、Xuyan Cao
DOI:10.1055/a-1516-7917
日期:2021.10
The use of ytterbium(II) reagent as both nucleophilic reagent and single-electron transfer reagent in the reaction of isatin derivatives with ytterbium(II) reagent is reported. From a synthetic point of view, a general, efficient, and experimentally simple one-pot method for the preparation of 3-substituted 2-oxindoles was developed.
报道了使用镱 (II) 试剂作为亲核试剂和单电子转移试剂在靛红衍生物与镱 (II) 试剂的反应中。从合成的角度来看,开发了一种通用、高效且实验简单的一锅法制备 3-取代 2-羟吲哚。
Bismuthtriflate-catalyzed Reaction of<i>N</i>-Alkylisatins with Allyltrimethylsilane
作者:Harhadas M. Meshram、Palakuri Ramesh、B. Chennakesava Reddy、G. Santosh Kumar
DOI:10.1246/cl.2011.357
日期:2011.4.5
An efficient and generalmethod has been described for the synthesis of 3-allyl-3-hydroxyoxindole by the reaction of isatins with allyltrimethylsilane in the presence of Bi(OTf)3·4H2O. The method i...
The asymmetric synthesis of the 3-allyl-3-hydroxyoxindole skeleton was accomplished in yields up to 99% via a metal-free and enantioselective allylation of isatins (90–96% ee) using BINOL derivatives as catalysts and an optimized allylboronate. This methodology was applied at a gram-scale to the synthesis of the natural product (R)-chimonamidine.
Diversity-Oriented Synthesis of Oxacyclic Spirooxindole Derivatives through Ring-Closing Enyne Metathesis and Intramolecular Pauson-Khand (2+2+1) Cyclization of Oxindole Enynes
reagent‐based diversity‐oriented synthesis (DOS) of novel fused spirooxindole scaffolds from oxindole enynes has been developed. The reaction involves a metal‐catalyzed C‐3 allylation/vinylation/homoallylation of N‐substituted isatins which gives rise to the corresponding alcohols that can be converted into the required enynes. Further transformation to diverse complex molecular scaffolds proceeds via a subsequent