title: Pyrrolo[1,2-a]quinoxalines: novel synthesis via annulation of 2-alkylquinoxalines.
abstract: In an attempt to synthesize a novel homoleptic complex 3 from 2-methyl-3-phenylquinoxaline 1 and Ir(acac)(3) for application as a triplet emitter in OLEDs (organic light-emitting diodes) no cyclometalation was observed. Instead, an annulation to 1-methyl-4-phenylpyrrolo[1,2-a]quinoxaline 2 was observed. Since pyrroloquinoxalines are potentially bioactive and few paths for their synthesis are known, selected reactions and conditions were investigated, suggesting Ir(acac)(3) as catalyst and proving glycerol to be a reactant.
authors.affiliation: Labor für Elektrooptik am Institut für Hochfrequenztechnik, Technische Universität Braunschweig, Postfach 3329, 38023 Braunschweig, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Ammermann
authors.forename: Christian
authors.initials: C
authors.lastname: Hrib
authors.forename: Peter G
authors.initials: PG
authors.lastname: Jones
authors.forename: Wolf-Walther
authors.initials: WW
authors.lastname: du Mont
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Kowalsky
authors.forename: Hans-Hermann
authors.initials: HH
authors.lastname: Johannes
mesh_terms: D000478:Alkylation; D005990:Glycerol / Q000737:chemistry; D008958:Models, Molecular; D015394:Molecular Structure; D011758:Pyrroles / Q000138:chemical synthesis*; D011810:Quinoxalines / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D011758:Pyrroles; D011810:Quinoxalines; C531444:pyrrolo(1,2-a)quinoxaline; D005990:Glycerol