Allylic C–H alkylation with a CF3-containing nucleophile
作者:Lun Li、Qing-Yun Chen、Yong Guo
DOI:10.1039/c3cc43120g
日期:——
Allylic C-H alkylation of allylarenes with dimethyl 2-trifluoromethylmalonate was successfully developed. The reactions were carried out at room temperature in the presence of a catalytic amount of Pd(OAc)2/Ph3P and a stoichiometric amount of 2,6-dimethylbenzoquinone. The reactions avoided defluorination successfully, providing a new method to construct a CF3-containing all-carbon quaternary center
Pd-Catalyzed Allylic Alkylation of CF3-Containing Esters with Three Electron-Withdrawing Groups
作者:Yong Guo、Lun Li、Donghui Huang、Qing-Yun Chen
DOI:10.1055/s-0032-1318313
日期:——
Tsuji-Trost reaction (Pd-catalyzed allylic alkylation) of CF3-containing esters with three electron-withdrawing groups is reported. The reactions with methyl bis(trifluoromethyl) acetate and dimethyl ( trifluoromethyl) malonate were carried out with low-loading catalysts of Pd(0) and XPhos at ambient temperature in THF, giving the products in high yields. This method efficiently overcomes the beta-defluorination, which is hard to control in the chemical transformation of alpha-trifluoromethyl carbanions, and provides versatile fluorinated compounds with quaternary carbon centers, which are highly demanded in drug discovery.