Annulation of imidazolines: A 1,3-dipolar cycloaddition route to pyrroloimidazoles, pyrrolidines and pyrroles

Article abstract of DOI:10.1016/0040-4039(90)80221-7

Azomethine ylides, prepared from imidazolinium salts, undergo 1,3-dipolar cycloaddition with a variety of dipolarophiles to produce hexahydropyrrolo[1,2-α]imidazoles, which are reduced to pyrrolidines; with 2-chloroacrylonitrile as dipolarophile, pyrroles