Synthesis of Enol Lactones via Cu(I)-Catalyzed Intramolecular O-Vinylation of Carboxylic Acids
Changhui Sun, Yewen Fang, Shuang Li, Yue Zhang, Qiwu Zhao, Shana Zhu and Chaozhong Li*
*State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China, Email: cligmail.sioc.ac.cn
C. Sun, Y. Fang, S. Li, Y. Zhang, Q. Zhao, S. Zhu, C. Li, Org. Lett., 2009, 11, 4084-4087.
DOI: 10.1021/ol9015578 (free Supporting Information)
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In the presence of CuI/trans-N,N′-dimethylcyclohexane-1,2-diamine as catalyst, a number of carboxylic acids underwent efficient intramolecular O-vinylation with vinyl bromides leading to the corresponding five- and six-membered enol lactones. The same catalytic system also enabled an efficient cycloisomerization of alkynoic acids.
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