Synlett 2009(16): 2663-2668  
DOI: 10.1055/s-0029-1217958
LETTER
© Georg Thieme Verlag Stuttgart ˙ New York

Facile CuI-Catalyzed Arylation of Azoles and Amides Using Simple Enaminones as Efficient Ligands

Cungui Chenga, Gonglei Suna, Jieping Wanb, Cuirong Sun*b
a Department of Chemistry, Zhejiang Normal University, Jinhua 321004, P. R. of China
b Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. of China
Fax: +86(571)87951629; e-Mail: suncuirong@zju.edu.cn;
Further Information

Publication History

Received 16 June 2009
Publication Date:
04 September 2009 (online)

Abstract

(E)-3-(Dimethylamino)-1-(2-hydroxyphenyl)prop-2-en-1-one was found to be an excellent ligand for copper-catalyzed N-arylation of azoles and amides with aryl halides under mild conditions. The reaction took place at 82 ˚C in MeCN with broad functional-group compatibility. A combination of the ligand and CuI proved to be an efficient catalytic system to promote the coupling reactions of aryl halides with azoles and amides.

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General Procedure
All chemicals were obtained from commercial source and used without further purification. A stirred suspension of aryl halides (0.5 mmol), azoles or amides (0.5 mmol), CuI powder (0.05 mmol), Cs2CO3 (1.0 mmol), and L5 (0.1 mmol) in MeCN was refluxed for 12 h (monitored by TLC) under nitrogen. After the mixture was cooled to r.t., the MeCN was removed in vacuo. The solid was then extracted with EtOAc (3 × 10 mL), washed with H2O (3 × 10 mL), and dried over Na2SO4. After the solvent was removed, the crude mixture was purified by silica gel column chromatography to provide the desired product.