Abstract
The reaction between a variety of o-phenylenediamines (=benzene-1,2-diamines), dialkyl acetylenedicarboxylates, and derivatives of nitrostyrene (=(E)-(2-nitroethenyl)benzene) in the presence of sulfamic acid (SA; H3NSO3) as catalyst led to the corresponding pyrrolo[1,2-a]quinoxaline-4(5H)-one derivatives in high yields.
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