[reaction: see text] The radical trifluoromethylation of ketonesilylenolethers gave alpha-CF(3) ketones in good yields with wide scope of the ketonic substrates including acyclic ketones and cyclopentanone. The use of dialkylzinc to activate the silylenolethers is the key to the efficient radical trifluoromethylation.
Facile Radical Trifluoromethylation of Lithium Enolates
作者:Yoshimitsu Itoh、Koichi Mikami
DOI:10.1021/ol0517574
日期:2005.10.1
[GRAPHICS]Highly basic lithium enolates are shown to be applicable to radical trifluoromethylation. The reaction is extremely fast, and the minimum reaction time is similar to 1 s.
Radical trifluoromethylation of ketone Li enolates
作者:Yoshimitsu Itoh、Koichi Mikami
DOI:10.1016/j.tet.2006.03.115
日期:2006.7
It has generally been believed that highly basic Li enolates cannot be applied as substrates for radical trifluoromethylation due to defluorination of the alpha-CF3 product. However, Li enolates can be in fact employed for radical trifluoromethylation. Moreover, the reaction is extremely fast and the minimum reaction time is only similar to 1 s. (c) 2006 Elsevier Ltd. All rights reserved.
Zincate-type enolate for radical α-trifluoromethylation
Ketone zincate-type enolates can be applied to radical trifluoromethylation for the general synthesis of alpha-CF3-ketones, cyclopentanones in particular. The addition of diethylzinc to lithium enolates is the key in the preparation of the zincate-type enolates for efficient radical trifluoromethylation. (c) 2007 Elsevier Ltd. All rights reserved.
Dialkylzinc-accelerated α-Trifluoromethylation of Carbonyl Compounds Catalyzed by Late-transition-metal Complexes
作者:Yuichi Tomita、Yoshimitsu Itoh、Koichi Mikami
DOI:10.1246/cl.2008.1080
日期:2008.10.5
Trifluoromethylation of ketone silyl enol ethers is found to be significantly accelerated by late-transition-metal catalysts and dialkylzincs to give α-trifluoromethyl ketones in good yields. Addition of dialkylzinc is the key to the high yielding α-trifluoromethylation of carbonyl compounds.