and Lu's reagent 1 a being the most reactive and Billard's reagent 1 h being the least reactive electrophile. While the observed electrophilic reactivities (E) of the amido‐derived trifluoromethylthiolating reagents correlate well with the calculated Gibbs energies for heterolytic cleavage of the X−SCF3 bonds (Tt+DA), the cumol‐derivedreagents 1 f and 1 g are more reactive than expected from the thermodynamics
Metal-Free Direct Dehydroxytrifluoromethylthiolation of Alcohols via the Umpolung Reactivity of Trifluoromethanesulfenamides
作者:Quentin Glenadel、Anis Tlili、Thierry Billard
DOI:10.1002/ejoc.201600197
日期:2016.4
A direct dehydroxytrifluoromethylthiolation of alcohols with trifluoromethanesulfenamide has been described. This method, based on the original umpolungreactivity of trifluoromethanesulfenamides, proposes a direct “OH-SCF3 exchange” under mild and, more especially, metal-free conditions.
Copper‐catalyzeddirect perfluoroalkylthiolation of alkynes by using the corresponding perfluoroalkanesulfenamide reagent is reported. The selective mono‐ and bis‐perfluoroalkylthiolation of alkynes can be conducted under very mild conditions (no base, room temperature) in very good to excellent yields. This approach, which uses a low toxicity, inexpensive copper catalyst that incorporates a commercially
Acid-Catalyzed Synthesis of α-Trifluoromethylthiolated Carbonyl Compounds
作者:Sébastien Alazet、Ermal Ismalaj、Quentin Glenadel、Didier Le Bars、Thierry Billard
DOI:10.1002/ejoc.201500710
日期:2015.7
α-trifluoromethylthiolation of carbonylcompounds in soft acidic conditions has been developed. With this method only mono-trifluoromethylthiolation was selectively observed. Base-sensitive ketones can then be trifluoromethylthiolated. More sensitive aldehydes are also trifluoromethylthiolated under these conditions with good yields. This work provides a new route towards the synthesis of various valuable t
Electrophilic Trifluoromethylthiolation of Carbonyl Compounds
作者:Sébastien Alazet、Luc Zimmer、Thierry Billard
DOI:10.1002/chem.201403409
日期:2014.7.7
prefunctionalization, has been developed. Aldehydes, ketones, esters, amides, keto‐esters, alkaloids, and steroids have been trifluoromethylthiolated with good yields. This work, proposing a new reagent for electrophilic trifluoromethylthiolation, provides a route towards the original synthesis of various trifluoromethylthiolated molecules for further applications.