title: Synthesis of pyrrolo[3,2-a]phenazines from 5-nitroindoles and anilines.
abstract: Anilines react with 5-nitroindoles in the presence oft-BuOK inN,N-dimethylformamide (DMF) to form 5-nitroso-4-arylaminoindoles that in turn when treated withN,O-bis(trimethylsilyl)acetamide cyclize to pyrrolo[3,2-a]phenazines. In an alternative approach pyrrolo[3,2-a]phenazines are formed from aminoindoles and nitroarenes.
authors.affiliation: Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, P.O. Box 58, 01-224 Warsaw, Poland.
authors.forename: Zbigniew
authors.initials: Z
authors.lastname: Wróbel
authors.affiliation: Department of Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warsaw, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Więcław
authors.affiliation: Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, P.O. Box 58, 01-224 Warsaw, Poland.
authors.forename: Robert
authors.initials: R
authors.lastname: Bujok
authors.affiliation: Institute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, P.O. Box 58, 01-224 Warsaw, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Wojciechowski
keywords: Amines; Anions; Cyclizations; Heterocycles; Lewis acids; Nucleophilic substitutions