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.
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.