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Synthesis 2017; 49(20): 4676-4686
DOI: 10.1055/s-0036-1589071
DOI: 10.1055/s-0036-1589071
special topic
Improved Synthesis of Symmetrical 2,5-Diarylimidazoles by One-Pot Palladium-Catalyzed Direct Arylation Tailored on the Electronic Features of the Aryl Halide
This work was supported by the Università di Pisa under the projects PRA 2015 (project no. 2015_0038) and PRA 2017 (project no. 2017_28).Further Information
Publication History
Received: 22 May 2017
Accepted after revision: 19 June 2017
Publication Date:
31 July 2017 (online)
![](https://www.thieme-connect.de/media/synthesis/201720/lookinside/thumbnails/ss-2017-c0347-st_10-1055_s-0036-1589071-1.jpg)
Dedicated to Prof. Renzo Rossi on the occasion of his 80th birthday
Published as part of the Special Topic Modern Strategies for Heterocycles Synthesis
Abstract
Two methods for the one-pot synthesis of 2,5-diarylimidazoles by palladium-catalyzed direct C–H arylation of 1-substituted imidazoles with aryl bromides have been devised. The first method, promoted by copper(I) iodide, is best suited for electron-poor aryl bromides, and also allows the 2,5-diarylation of thiazole and oxazole. The use of xylene instead of DMA is the key for the efficiency of the second method, which gives the best results with electron-rich aryl bromides.
Key words
direct arylation - imidazoles - palladium - C–C coupling - regioselectivity - C–H bond activation - catalysis - aryl halidesSupporting Information
- Supporting information for this article is available online at https://doi.org/10.1055/s-0036-1589071
- Supporting Information
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