Transition-Metal-Free Synthesis of Oxindoles by Potassium tert-Butoxide-Promoted Intramolecular α-Arylation
摘要:
Potassium tert-butoxide-mediated intramolecular alpha-arylations of fluoro- and chloro-substituted anilides provide oxindoles in DMF at 80 degrees C. In this manner, diversely substituted products have been obtained in moderate to high yields.
Oxindole synthesis <i>via</i> polar–radical crossover of ketene-derived amide enolates in a formal [3 + 2] cycloaddition
作者:Niklas Radhoff、Armido Studer
DOI:10.1039/d1sc07134c
日期:——
and transition-metal free method for the preparation of valuable and sterically hindered 3,3-disubstituted oxindoles via polar–radical crossover of ketene derived amide enolates. Various easily accessible N-alkyl and N-arylanilines are added to disubstituted ketenes and the resulting amide enolates undergo upon single electron transfer oxidation a homolytic aromatic substitution (HAS) to provide 3,3-disubstituted