A general and convenient copper-mediated trifluoromethylthiolation of primary and secondary alkyl halides was described. Variation of the solvent, additives and time allowed optimization of the reaction. A wide range of alkyl halides were explored to give a set of alkyl trifluoromethyl thioethers in moderate to excellent yields. A variety of functional groups, including ethers, thioether, esters, nitriles, amides, and ketal groups, were well tolerated in the electrophilic partner.
trifluoromethylthiolation of vinyl bromides has been developed. This method provides ready access to vinyl trifluoromethylthioethers in good to high yields fromsimple, inexpensive starting materials. A broad substrate scope is achieved, and the reaction is compatible with various functional groups, including cyano, nitro, trifluoromethyl, alkoxy, amino, halide, and heterocyclic groups.
An Improved Protocol for the Synthesis of α-Trifluoromethylthio-Substituted Ketones by Copper-Mediated Trifluoromethylthiolation of α-Bromo Ketones
作者:Yangjie Huang、Xing He、Haohong Li、Zhiqiang Weng
DOI:10.1002/ejoc.201403221
日期:2014.11
An efficient and practical approach to α-trifluoromethylthio-substituted ketones was developed. The trifluoromethylthiolation of (bpy)Cu(SCF3) (bpy = 2,2′-bipyridyl) with various α-bromoketones afforded the desired α-trifluoromethylthio-substituted ketones in good yields. The reaction tolerates more functionally than previously reported methods and demonstrates efficient scalability and practicality
A facilepreparation of allylictrifluoromethylthioethers was achieved by using a copper reagent. The reaction of (bpy)Cu(SCF3) with various allylicbromides afforded the desired trifluoromethylthiolation products in good to excellent yields with high stereo‐ and regioselectivity. Common functional groups such as alkyl, alkoxy, trifluoromethyl, nitro, halides and geranyl are well tolerated.