Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 364, Issue 16, Pages 2748-2752Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.202200527
Keywords
sulfur catalysis; quinoxaline; DMSO
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Funding
- Vietnam Academy of Science and Technology [NCVCC06.04/21-21]
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We report the catalytic activity of elemental sulfur in the oxidative condensation reaction, which can efficiently synthesizes a variety of quinoxaline compounds.
While elemental sulfur has been largely used as oxidant or sulfurating agent, its role as a catalyst has not been developed. We report here its catalytic activity in the oxidative condensation of o-phenylenediamines with acetophenones in DMSO to provide quinoxalines. The method was also extended to alpha-tetralones, propiophenones (R = Me) as well as higher homologues (R = Et, n-Pr) in place of acetophenones, leading to a wide range of naphthoquinoxalines and 3-substituted 2-arylquinoxalines.
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