Selective aliphatic fluorination by halogen exchange in mild conditions
摘要:
HF-Base media, in particular (HF)(10)-pyridine or (HF)(3)-triethylamine, allow aliphatic chlorine-fluorine exchanges on acid-sensitive molecules. Depending on the nature (pyridine or triethylamine), stoichiometry of the base and temperature, selective mono-, di-, or tri-chlorine-fluorine exchanges on trichloromethyl groups alpha to sulfur, oxygen and carbon atoms can be obtained. (C) 2005 Elsevier B.V. All rights reserved.
Trifluoromethanesulfanylamides as Easy-to-Handle Equivalents of the Trifluoromethanesulfanyl Cation (CF<sub>3</sub>S<sup>+</sup>): Reaction with Alkenes and Alkynes
作者:Aurélien Ferry、Thierry Billard、Bernard R. Langlois、Eric Bacqué
DOI:10.1002/anie.200903387
日期:2009.10.26
Making introductions: The CF3S unit can be added in an electrophilic fashion to alkenes and alkynes in reactions with trifluoromethanesulfanylamide reagents (see scheme; Ts=toluene‐4‐sulfonyl). The products obtained may be of interest, for example, in pharmaceutical chemistry and materials science.
Catalytic addition of trihalogenomethanesulfenyl chlorides to olefinic compounds
作者:A. Haas、M. Lieb、Yuanfa Zhang
DOI:10.1016/s0022-1139(00)80889-1
日期:1985.11
Trifluoroacetic acid has been found to be an efficient catalyst for the addition of fluorochloromethanesulfenyl chlorides CFnCl3−nSCl (n = 1, 2, 3) to olefins such as cyclohexene, 1-hexene, allyl bromide and vinyl bromide. The reaction with cyclohexene led to trans adducts. The addition to asymmetrical olefins afforded a mixture of Markovnikov- and anti-Markovnikov oriented adducts. The factors influencing
已发现三氟乙酸是将氟氯甲烷亚磺酰氯CF n Cl 3-n SCl(n = 1,2,3)加至烯烃如环己烯,1-己烯,烯丙基溴和乙烯基溴的有效催化剂。与环己烯的反应产生反式加合物。向不对称烯烃的加成提供了马尔可夫尼可夫和反马尔可夫尼可夫取向的加合物的混合物。讨论了影响反应过程的因素。
First and second generation of trifluoromethanesulfenamide reagent: A trifluoromethylthiolating comparison
Trifluoromethylthiolation of molecules is a more and more studied reaction. In particular, the direct electrophilic trifluoromethylthiolation plays an important role in this chemistry. Among the various developed reagents, trifluoromethanesulfenamides constitute an efficient family of reagents. However, no systematic comparison of these two generations has been realized. In this paper, the difference of reactivity of these reagents is studied towards various nucleophiles. (C) 2015 Elsevier B.V. All rights reserved.
Selective aliphatic fluorination by halogen exchange in mild conditions
作者:Laurent Saint-Jalmes
DOI:10.1016/j.jfluchem.2005.10.006
日期:2006.1
HF-Base media, in particular (HF)(10)-pyridine or (HF)(3)-triethylamine, allow aliphatic chlorine-fluorine exchanges on acid-sensitive molecules. Depending on the nature (pyridine or triethylamine), stoichiometry of the base and temperature, selective mono-, di-, or tri-chlorine-fluorine exchanges on trichloromethyl groups alpha to sulfur, oxygen and carbon atoms can be obtained. (C) 2005 Elsevier B.V. All rights reserved.