Synthesis 2020; 52(04): 544-552
DOI: 10.1055/s-0039-1690244
paper
© Georg Thieme Verlag Stuttgart · New York

Copper-Catalyzed Aerobic Oxidative Alkynylation of 3,4-Dihydroquinoxalin-2-ones

Jaume Rostoll-Berenguer
,
Gonzalo Blay
,
José R. Pedro
,
Carlos Vila
Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València, Spain   Email: jose.r.pedro@uv.es   Email: carlos.vila@uv.es
› Author Affiliations
Financial support from the Agencia Estatal de Investigación (AEI, Spanish Government) and the European Regional Development Fund (FEDER, European Union) (CTQ2017-84900-P) is acknowledged. J.R.-B. thanks the Ministerio de Ciencia, Innovación y Universidades for a FPU predoctoral contract and C.V. thanks the Agencia Estatal de Investigación (AEI, Spanish Government) for RyC contract (RYC-2016-20187).
Further Information

Publication History

Received: 18 September 2019

Accepted after revision: 16 October 2019

Publication Date:
04 November 2019 (online)


Published as part of the Bürgenstock Special Section 2019 Future Stars in Organic Chemistry

Abstract

Herein, we described a ligand-free copper-catalyzed aerobic oxidative functionalization of 3,4-dihydroquinoxalin-2(1H)-ones with terminal alkynes using visible-light and oxygen as terminal oxidant to give 3-ethynyl-3,4-dihydroquinoxalin-2(1H)-one, cyclic propargylic amines, in moderate to good yields. Moreover, we demonstrate the versatility of the 3-ethynyl-3,4-dihydroquinoxalin-2(1H)-ones obtained by preparing several 3,4-dihydroquinoxalin-2-one derivatives.

Supporting Information