Sulfur‐Catalyzed Oxidative Condensation of Aryl Alkyl Ketones with
<i>o</i>
‐Phenylenediamines: Access to Quinoxalines
作者:Le Anh Nguyen、Thi Thu Tram Nguyen、Quoc Anh Ngo、Thanh Binh Nguyen
DOI:10.1002/adsc.202200527
日期:2022.8.16
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 α-tetralones, propiophenones (R=Me) as well as higher homologues (R=Et, n-Pr) in place of acetophenones