The application of a synthetic sequence of amine-exchange/Ullmann-ether reaction to 1,2-diarylenamino-ketones for the access to dibenzoxepino[4,5-d]pyrazoles is reported. The reaction proceeds efficiently, permitting to incorporate a variety of substituents. (C) 2000 Elsevier Science Ltd. All rights reserved.
A novel palladium intramolecular diaryl ether formation
This paper presents an efficient methodology for the preparation of dibenzoxepino[4,5-d]pyrazoles using a novel intramolecular palladium catalyzed diaryl ether formation. The effect of different chelating ligand systems, along with the unusual coupling reaction of phenoxides with aryl iodides and non-activated aryl moieties are also reported. (C) 2000 Elsevier Science Ltd. All rights reserved.