Synthesis of Dispiro[indeno[1,2-b]quinoxaline-11,1′-pyrrolo-[2,1-a]isoquinoline-3′,3′′-indolin]-2′′-one Derivatives via Cycloaddition Reactions

The 1,3-dipolar cycloaddition reaction of ( Z )-1-aryl-2-(11 H -indeno[1,2- b ]quinoxalin-11-ylidene)ethan-1-one with generated in situ azomethine ylide leads to novel 2′-(arylcarbonyl)-6′,10b′-dihydro-2′ H ,5′ H -dispiro[indeno[1,2- b ]quinoxaline-11,1′-pyrrolo[2,1- a ]isoquinoline-3′,3′′-indolin]-2′′-one derivatives in moderate yields. Structures of all products have been characterized by NMR, IR and HRMS spectra, and X-ray crystallographic analysis.