Copper-Catalyzed Aminotrifluoromethylation of Unactivated Alkenes with (TMS)CF3: Construction of Trifluoromethylated Azaheterocycles
摘要:
The first example of a copper(I)-catalyzed intramolecular aminotrifluoromethylation of unactivated alkenes using (TMS)CF3 (trimethyl(trifluoromethyl)silane) as the CF3 source is described. A broad range of electronically and structurally varied substrates undergo convenient and step-economical transformations for the concurrent construction of a five- or six-membered ring and a C-CF3 bond toward different types of trifluoromethyl azaheterocycles. The methodology not only circumvents use of expensive electrophilic CF3 reagents or the photoredox strategy but also expands the scope to substrates that are difficult to access by the existing methods. Mechanistic studies are conducted, and a plausible mechanism is proposed.
Efficient Copper-Catalyzed Direct Intramolecular Aminotrifluoromethylation of Unactivated Alkenes with Diverse Nitrogen-Based Nucleophiles
作者:Jin-Shun Lin、Ya-Ping Xiong、Can-Liang Ma、Li-Jiao Zhao、Bin Tan、Xin-Yuan Liu
DOI:10.1002/chem.201303387
日期:2014.1.27
A mild, convenient, and step‐economical intramolecular aminotrifluoromethylation of unactivated alkenes with a variety of electronically distinct, nitrogen‐based nucleophiles in the presence of a simple copper salt catalyst, in the absence of extra ligands, is described. Many different nitrogen‐based nucleophiles (e.g., basic primaryaliphatic and aromaticamines, sulfonamides, carbamates, and ureas)