title: Brønsted acid catalyzed cascade reactions of 2-[(2-aminophenyl)ethynyl]phenylamine derivatives with aldehydes: a new approach to the synthesis of 2,2'-disubstituted 1H,1'H-3,3'-biindoles.
abstract: An unusual Brønsted acid catalyzed cascade reaction of 2-[(2-aminophenyl)ethynyl]phenylamine derivatives with aryl(heteroaryl)aldehydes to afford an efficient alternative entry into 2,2'-disubstituted-1H,1'H-3,3'-biindoles under metal-free conditions is reported.
authors.affiliation: Dipartimento di Scienze Fisiche e Chimiche, Università di L'Aquila , Via Vetoio 67010 Coppito (AQ), Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Arcadi
authors.forename: Marco
authors.initials: M
authors.lastname: Chiarini
authors.forename: Gaetano
authors.initials: G
authors.lastname: D'Anniballe
authors.forename: Fabio
authors.initials: F
authors.lastname: Marinelli
authors.forename: Emanuela
authors.initials: E
authors.lastname: Pietropaolo