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A facile strategy was developed for the synthesis of biologically important 4,5‐dihydropyrrolo[1,2‐a]quinoxalines and pyrrolo[1,2‐a]quinoxalin]‐2‐ones by treating 2‐(1H‐pyrrol‐1‐yl)anilines with imidazo[1,2‐a]pyridine‐3‐carbaldehyde or isatin, using amidosulfonic acid (NH3SO3) as a solid catalyst in water at room temperature. The protocol has been extended to electrophile ninhydrin. The catalyst could...
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