<i>N</i>-Trifluoromethylthiosaccharin: An Easily Accessible, Shelf-Stable, Broadly Applicable Trifluoromethylthiolating Reagent
作者:Chunfa Xu、Bingqing Ma、Qilong Shen
DOI:10.1002/anie.201403983
日期:2014.8.25
A new, electrophilic trifluoromethylthiolating reagent, N‐trifluoromethylthiosaccharin, was developed and can be synthesized in two steps from saccharin within 30 minutes. N‐trifluoromethylthiosaccharin is a powerful trifluoromethylthiolating reagent and allows the trifluoromethylthiolation of a variety of nucleophiles such as alcohols, amines, thiols, electron‐rich arenes, aldehydes, ketones, acyclic
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
Nucleophilic Trifluoromethylthiolation of Alkyl Chlorides, Bromides and Tosylates
作者:Chunfa Xu、Qingyun Chen、Qilong Shen
DOI:10.1002/cjoc.201500905
日期:2016.5
A direct nucleophilic trifluoromethylthiolation of alkyl chlorides, bromides and tosylates with AgSCF3 was described. It was found that the presence of nBu4NI or a combination of nBu4NI/nBu4NBr significantly enhanced the reaction rates. The reaction conditions were mild, thus allowing the tolerance of a variety of functional groups.
描述了用AgSCF 3烷基氯,溴化物和甲苯磺酸酯的直接亲核三氟甲基硫醇化。发现存在n Bu 4 NI或n Bu 4 NI / n Bu 4 NBr的组合显着提高了反应速率。反应条件温和,因此允许各种官能团的耐受性。
Copper-Catalyzed Synthesis of α-Trifluoromethylthio-Substituted Ketones
The CF3S-substituted moiety serves as an important structural element in many bioactive molecules. A versatile copper catalyst that allowed for trifluoromethylthiolation of primary and secondary α-bromoketones is described. The reaction with readily available elemental sulfur and CF3SiMe3 afforded a broad scope and moderate to good yields of α-trifluoromethylthio-substituted ketones. This procedure represents a very operationally simple yet powerful strategy for the synthesis of α-trifluoromethylthio-substituted ketones, a useful and versatile class of synthetic synthons.