Catalytic Domino Reaction of Ketones/Aldehydes with Me3SiCF2Br for the Synthesis of α-Fluoroenones/α-Fluoroenals
Xiaoning Song, Jian Chang, Dongsheng Zhu*, Jiaheng Li, Cong Xu, Qun Liu* and Mang Wang*
*Department of Chemistry, Northeast Normal University, Renmin Street 5268, Changchun 130024, P. R. China, Email: zhuds206nenu.edu.cn, liuqunnenu.edu.cn, wangm452nenu.edu.cn
X. Song, J. Chang, D. Zhu, J. Li, C. Xu, Q. Liu, M. Wang, Org. Lett., 2015, 17, 1712-1715.
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A domino reaction of enolizable carbonyl compounds with Me3SiCF2Br provides α-fluoroenones and α-fluoroenals via formation of difluorocarbene and silyl enol ether, difluorocyclopropanation, desilylation, ring-opening, and defluorination. Me3SiCF2Br acts as not only the difluorocarbene source but also the TMS transfer agent as well as internal bromide and fluoride anion catalyst. Only a catalytic amount of n-Bu4NBr as initiator is needed.
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