Abstract
1,3-Dipolar cycloaddition of nitrilimines 3 with N-benzyl maleimide 4 has provided 5-benzyl-1-(2′,4′-dibromophenyl)-3-(4″-substituted phenyl)-3a,4,6,6a-tetrahydro-1H,5H-pyrrolo[3,4-c]pyrazole-4,6-dione derivatives 5 in excellent yield as the only isomer through a concerted pathway.
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