Synthesis of carbazoles by intramolecular arylation of diarylamide anions.
J Org Chem
; 74(12): 4490-8, 2009 Jun 19.
Article
in En
| MEDLINE
| ID: mdl-19459669
ABSTRACT
The synthesis of a series of substituted 9H-carbazoles by the photostimulated S(RN)1 substitution reaction with diarylamines as starting substrate was performed. The diarylamines were obtained by two approaches, the Pd-catalyzed reactions (Buchwald-Hartwig) or Cu-catalyzed reactions of 2-haloanilines with aryl halides, or 2-bromoiodobenzene with anilines, with moderate to very good isolated yields (45-89%). Through an intramolecular C-C bond formation of diarylamines by the S(RN)1 mechanism, carbazoles were achieved. These reactions proceeded synthetically in very good to excellent yields (81-99%) in liquid ammonia and DMSO. The reaction of N-(2-bromophenyl)-2-phenylbenzenamine gave 1-phenyl-9H-carbazole (38%) and the isomer 9H-tribenz[b,d,f]azepine (58%). By using this methodology, 9H-carbazoles, substituted 9H-carbazoles, benzocarbazoles, and even 3,3'-bi(9H-carbazole) were obtained by a double S(RN)1 reaction with benzidine.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Benzene Derivatives
/
Carbazoles
/
Amides
/
Aniline Compounds
Language:
En
Journal:
J Org Chem
Year:
2009
Document type:
Article
Affiliation country: