Copper-catalysed approach to spirocyclic oxindoles via a direct C–H, Ar-H functionalisation
摘要:
A practical and efficient entry to spirocyclic oxindoles from readily accessible anilide precursors, using only catalytic amounts of an inexpensive copper salt together with air as the sole re-oxidant, is described. In addition to providing access to a broad range of spiro-oxindole products, the utility of this method is demonstrated in a formal synthesis of the natural product, horsfiline. (C) 2012 Elsevier Ltd. All rights reserved.
Fast Transition Metal‐Free Synthesis of Functionalized Oxindoles and Dihydroquinoline‐2‐ones Under Microwave Irradiation
作者:Júlia L. Couto、Milene M. Hornink、Vinicius R. Nascimento、Leandro H. Andrade
DOI:10.1002/ejoc.202200962
日期:2022.11.25
A fast transition metal-free methodology for the synthesis of highly functionalized heterocycles was developed. The exploitation of formamide or N-methylformamide and potassium persulfate undermicrowaveirradiation resulted in a reaction of 10 s. The functionalized oxindoles and dihydroquinoline-2-ones give access to several spirolactones and spiroimides.