title: Intramolecular [2+2+2] cycloaddition of bis(propargylphenyl)carbodiimides: synthesis of L-shaped π-extended compounds with pyrrolo[1,2-a][1,8]naphthyridine corner units.
abstract: L-shaped π-extended penta-, hexa-, and heptacycles with a pyrrolo[1,2-a][1,8]naphthyridine junction were prepared from N,N'-bis[2-(2-alkyn-1-yl)phenyl]carbodiimides or their naphthyl analogs via Rh(I)-catalyzed intramolecular [2+2+2] cycloaddition and dehydrogenative aromatization. These L-shaped compounds emit sky-blue, yellow-green, or golden-orange fluorescence, with high quantum yields.
authors.affiliation: Department of Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Tokyo 162-8601, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Otani
authors.forename: Takao
authors.initials: T
authors.lastname: Saito
authors.forename: Ryota
authors.initials: R
authors.lastname: Sakamoto
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Osada
authors.forename: Akihito
authors.initials: A
authors.lastname: Hirahara
authors.forename: Naoki
authors.initials: N
authors.lastname: Furukawa
authors.forename: Noriki
authors.initials: N
authors.lastname: Kutsumura
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Matsuo
authors.forename: Kohei
authors.initials: K
authors.lastname: Tamao