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
虽然元素
硫主要用作氧化剂或
硫化剂,但其作为催化剂的作用尚未开发。我们在此报告其在
邻苯二胺与
苯乙酮在
DMSO中氧化缩合以提供
喹喔啉的催化活性。该方法还扩展到 α-四氢
萘酮、
苯丙酮 (R=Me) 以及高级同系物 (R=Et, n -Pr) 以代替
苯乙酮,从而产生了范围广泛的
萘并
喹喔啉和 3-取代的 2-芳基
喹喔啉。