the stereoselectivesynthesis of various (E)-, (Z)-, and disubstituted 3-alkylideneoxindoles via radical cyclization reactions were investigated using tandem indium-mediated carbometallation and palladium-catalyzed cross-couplingreactions. The proper combination of substrates and reaction conditions is important for good yields. The key step is the first stereoselective carboindation reaction using
Synthesis, Structure and Emission Properties of Spirocyclic Benzofuranones and Dihydroindolones: A Domino Insertion–Coupling–Isomerization– Diels–Alder Approach to Rigid Fluorophores
作者:Daniel M. D'Souza、Alexander Kiel、Dirk-Peter Herten、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/chem.200700759
日期:2008.1.7
far thermodynamically and kinetically favored over a possible Claisenrearrangement. Compounds of this new class of spirocyclic compounds possess large Stokes shifts and fluoresce intensively with blue over green to orange colors. As a consequence of the spirocyclic rigidity fluorescence lifetimes and quantum yields are rather high in some cases.
Domino Carbopalladation/CH Functionalization Sequence: An Expedient Synthesis of Bis-Heteroaryls through Transient Alkyl/Vinyl-Palladium Species Capture
作者:Upendra K. Sharma、Nandini Sharma、Yogesh Kumar、Brajendra K. Singh、Erik V. Van der Eycken
DOI:10.1002/chem.201503708
日期:2016.1.11
A microwave‐assisted highly efficient intermolecular domino carbopalladation/CHfunctionalization sequence has been developed to access bis‐heteroaryl frameworks in a single operation. The reaction involves carbopalladation of the halogenated acrylamides or phenylpropiolamides by the Pd(0) catalysis, followed by the direct (hetero)arylation to give products with good to excellent yields. The synthetic
微波辅助高效分子间多米诺carbopalladation / C ħ官能序列已经发展到访问双-杂芳基的框架在单次操作。该反应涉及通过Pd(0)催化使卤化丙烯酰胺或苯基丙酰胺的碳弹法反应,然后进行直接(杂)芳基化反应,从而获得具有良好收率或优异收率的产品。该方法的综合用途也扩展到了Ugi-加合物作为起始原料的应用。
Palladium Nanoparticle-Catalyzed Stereoselective Domino Synthesis of 3-Allylidene-2(3<i>H</i>)-oxindoles and 3-Allylidene-2(3<i>H</i>)-benzofuranones
作者:Naziya Parveen、Govindasamy Sekar
DOI:10.1021/acs.joc.9b03397
日期:2020.4.3
stereoselective protocol for the synthesis of unsymmetrically substituted (E)-3-allylideneoxindole and (E)-3-allylidenebenzofuran from readily accessible starting materials using palladium binaphthyl nanoparticles (Pd-BNPs) has been developed. Pd-BNP showing a wide range of functional group tolerance and an immense array of substrate scope have been explored with the successful synthesis of the drug molecule “tubulin
Palladium‐Catalyzed 5‐
<i>exo‐dig</i>
Cyclization Cascade, Sequential Amination/Etherification for Stereoselective Construction of 3‐Methyleneindolinones
An cascade intramolecular 5‐exo‐dig cyclization of N‐(2‐iodophenyl)propiolamides and sequential amination/etherification (with N‐hydroxybenzamides, phenyl hydroxycarbamate) protocol for the synthesis of amino‐ and phenoxy‐substituted 3‐methyleneindolinones using unexpensive Pd(PPh3)4 as catalyst has been developed. The protocol enables the assembly of structurally important oxindole cores featuring