期刊
ORGANIC LETTERS
卷 19, 期 11, 页码 3021-3024出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.7b01304
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We describe the highly selective copper-catalyzed Ullmann-type coupling of bromoiodoarenes with oxazolidinones. 3,4,7,8-Tetramethyl-1,10-phenanthroline (Me4Phen) was identified as an optimal ligand promoting the desired C-N bond formation, while minimizing the competitive bromo-iodo exchange pathway that leads to formation of iodo-substituted and bis-coupled side products. The developed method is highly selective with a >98:2 ratio of the bromo- vs iodo-substituted compounds obtained in the isolated products.
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