“…24,25 For example, Yan and co-workers reported the synthesis of spiro[indoline-3,3′-pyrrolo[1,2a]isoquinolines] by a 1,3-dipolar cycloaddition reaction of N-phenacylquinolinium bromides with 3-phenacylideneoxindoles as dipolarophiles. 24 Because of the biological importance of pyrrolo[2,1a]isoquinolines and quinoxaline structures, and in continuation of related studies and our growing interest in developing 1,3-dipolar cycloaddition reactions, [26][27][28] we decided to synthesize spiroheterocycles containing both pyrrolo[2,1a]isoquinoline and quinoxaline moieties. To the best of our knowledge, this is the first report of a 1,3-dipolar cycloaddition of N-phenacylquinolinium bromides with 1-aryl-2-(11H-indeno[1,2-b]quinoxalin-11-ylidene)ethanones in which electron-deficient alkenes act as dipolarophiles to give functionalized spiropyrrolo[2,1-a]isoquinoline derivatives bearing four stereogenic centers.…”