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DOI: 10.1055/s-0030-1260954
Copper-Mediated Aryl Amination: In Situ Generation of an Active Copper(I) Species
Publication History
Publication Date:
14 July 2011 (online)

Abstract
We have developed novel conditions for copper-mediated aryl amination by using a combination of easy-to-handle and inexpensive Cu(OAc)2˙H2O and phenylhydrazine.
Key words
amine - aryl amination - copper - phenylhydrazine - reductant
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References and Notes
We reported that the aryl amination reaction with Cu(OAc)2 did not proceed in DMF (ref. 8). DMSO might work as a reductant under these conditions.
13Typical Procedure: A solution of copper(II) acetate monohydrate (0.40 mmol) and amine (4.0 mmol) in DMSO (1 mL) was stirred for 30 min at r.t., whereupon phenylhydrazine (0.20 mmol) was added. After stirring for 30 min, aryl iodide (1.0 mmol) was added to the solution. The reaction mixture was stirred for 30 min, and the solution was warmed to 90 ˚C. After stirring for 23 h at the same temperature, the solution was cooled to r.t. and diluted with EtOAc. The solution was washed with aq ammoniacal sodium chloride (3 ×). The combined aqueous layer was extracted with EtOAc (3 ×). The combined organic layer was washed with brine, dried over Na2SO4, and concentrated under reduced pressure. The residue was purified by column chromatography to give the corresponding aniline.