Room temperature facile synthesis of quinoxalines catalyzed by amidosulfonic acid

Abstract

(Chemical Equation Presented) Amidosulfonic acid NH2-SO 3H catalyzed direct condensations of o-phenylenediamines with α-diketones at room temperature in organic solvents to afford quinoxalines in excellent yields. The amidosulfonic acid as a solid acid catalyst in this preparation was efficient and recoverable.