Zhao D, Wang W, Yang F, Lan J, Yang L, Gao G, You J. Copper-catalyzed direct C arylation of heterocycles with aryl bromides: discovery of fluorescent core frameworks.
Angew Chem Int Ed Engl 2009;
48:3296-300. [PMID:
19338010 DOI:
10.1002/anie.200900413]
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Abstract
A window of opportunity: A general copper-catalyzed C-H bond-activation path allows arylation of heterocycles with a wide range of aryl bromides (see scheme). The reaction shows excellent regioselectivity and exhibits good functional group tolerance. The 8-aryl xanthines exhibit fluorescence in a variety of solvents and show promise as reagents for biological imaging.
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