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.
Structure–Reactivity Relationship of Trifluoromethanesulfenates: Discovery of an Electrophilic Trifluoromethylthiolating Reagent
作者:Xinxin Shao、Chunfa Xu、Long Lu、Qilong Shen
DOI:10.1021/jo502645m
日期:2015.3.20
A family of electrophilic trifluoromethanesulfenates was prepared. Structure–reactivity relationship studies showed that the substituted groups on the aryl ring of the trifluoromethylthiolating reagent did not have an obvious influence on their reactivities. A simplified electrophilic trifluoromethylthiolating reagent 1c was then identified that can react with a wide range of nucleophiles such as Grignard
Difluorocarbene‐Derived Trifluoromethylthiolation and [
<sup>18</sup>
F]Trifluoromethylthiolation of Aliphatic Electrophiles
作者:Jian Zheng、Lu Wang、Jin‐Hong Lin、Ji‐Chang Xiao、Steven H. Liang
DOI:10.1002/anie.201505446
日期:2015.11.2
The first trifluoromethylthiolation and [18F]trifluoromethylthiolation of alkyl electrophiles with in situ generated difluorocarbene in the presence of elemental sulfur and external (radioactive) fluoride ion is described. This transition‐metal‐free approach is high yielding, compatible with a variety of functional groups, and operated under mild reaction conditions. The conceptual advantage of this
Iron-Catalyzed Decarboxylation of Trifluoroacetate and Its Application to the Synthesis of Trifluoromethyl Thioethers
作者:Benjamin Exner、Bilguun Bayarmagnai、Fan Jia、Lukas J. Goossen
DOI:10.1002/chem.201503915
日期:2015.11.23
Nucleophilic CF3 has been generated by decarboxylation of potassium trifluoroacetate, arguably the most easy‐to‐handle, inexpensive, and sustainable source of trifluoromethyl groups. Simple iron(II) chloride catalyzes the decarboxylation as well as a subsequent trifluoromethylation of organothiocyanates, resulting in a straightforward synthesis of trifluoromethylthioethers. The KCN byproduct is absorbed by
Electrophilic Trifluoromethanesulfanylation of Organometallic Species with Trifluoromethanesulfanamides
作者:François Baert、Julie Colomb、Thierry Billard
DOI:10.1002/anie.201205156
日期:2012.10.8
It's so easy! Direct trifluoromethanesulfanylation reactions remain difficult to perform because of the lack of reagents that are stable and easy to handle. Trifluoromethanesulfanamides are reagents which, in combination with readily available Grignard reagents, can be used by those without experience in fluorine chemistry to easily synthesize trifluoromethylthioethers.