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The discovery of multicomponent condensation of aromatic amines, aldehydes and diacetyl, which leads directly to pyrrole[3,2‐b]pyrroles, has opened the door to a repertoire of π‐expanded indolo[3,2‐b]indoles. Derivatives bearing two C≡C triple bonds undergo intramolecular double cyclization to give sterically congested hexacyclic heterocycles. Both bis‐alkynes and final ladder‐shaped compounds possess...
Sterically hindered 1,4‐dihydropyrrolo[3,2‐b]pyrroles possessing ortho‐(arylethynyl)phenyl substituents at positions‐2 and ‐5 were efficiently synthesized through a sila‐Sonogashira reaction. These unique Z‐shaped dyes showed relatively strong fluorescence in solution. Detailed optimization revealed that, in the presence of InCl3, these alkynes readily undergo an intramolecular double cyclization...
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