organic compounds with a trifluoromethyl group. A new and facile synthesis of ketones with a trifluoromethyl substituent in the α‐position proceeds through a one‐potphotoredox‐catalyzed trifluoromethylation–oxidation sequence of aromatic alkenes. Dimethyl sulfoxide (DMSO) serves as a key and mild oxidant under these photocatalytic conditions. Furthermore, an iridium photocatalyst, fac[Ir(ppy)3] (ppy=2‐phenylpyridine)
Synthesis of α-CF3 carbonylcompounds has been recognized to be difficult up to now because the polarization of CF3δ−-Iδ+ is opposite to that of CH3δ+-Iδ−, and this makes it difficult to introduce CF3+ unit to enolates. We recently reported an effective α-trifluoromethylation of ketones by using Et2Zn with Rh catalyst, but the mechanism has not fully been cleared. Now, we carried out the detailed mechanistic
Cooperative catalysis involving copper(ii) complex bearing redox ligands allows generation of CF˙3 radicals through ligand-based SET while metallic oxidation state is preserved.
铜(II)配合物参与的合作催化可以通过氧化还原配体产生CF˙3自由基,同时保持金属的氧化态。
Diastereoselective trifluoromethylation of chiral imide enolates with iodotrifluoromethane mediated by triethylborane
The trifluoromethylation of lithium enotates of chiral N-acyloxazolidinones with iodotriftuoromcthane mediated by triethylborone proceeds with good diastereomeric excess.
Synthesis of α-Trifluoromethyl Ketones via the Cu-Catalyzed Trifluoromethylation of Silyl Enol Ethers Using an Electrophilic Trifluoromethylating Agent
作者:Lun Li、Qing-Yun Chen、Yong Guo
DOI:10.1021/jo500713f
日期:2014.6.6
A method has been developed for the synthesis of α-trifluoromethyl ketones via the Cu-catalyzed trifluoromethylation of silyl enol ethers with an electrophilic trifluoromethylating agent, which produces a trifluoromethyl radical.