Methyl fluorosulphonyldifluoroacetate; a new trifluoromethylating agent
作者:Qing-Yun Chen、Sheng-Wen Wu
DOI:10.1039/c39890000705
日期:——
Methylfluorosulphonyldifluoroacetate, in the presence of copper(I) iodide, is used as the source of trifluoromethyl group which replaces the halogen in aryl, alkenyl, and alkyl halides.
Potassium 3-oxa-ω-fluorosulfonylperfluoropentanoate (FO2SCF2CF2OCF2CO2K), a low-temperature trifluoromethylating agent for organic halides; its α-carbon-oxygen bond fragmentation
The trifluoromethylation of organichalides with FO2SCF2CF2OCF2CO2K (1) in DMF can be accomplished at 45 °C which is advantageous for thermally sensitive substrates. α-Carbon-oxygenbondfragmentation of 1 and the related β-carbon-oxygen bond scission are discussed.
在DMF中用FO 2 SCF 2 CF 2 OCF 2 CO 2 K (1)对有机卤化物进行三氟甲基化可以在45°C的温度下完成,这对热敏性基材是有利的。α的-碳-氧键断裂1和相关的β碳上-氧键断裂进行了讨论。
Lewis Acid Enabled Copper-Catalyzed Asymmetric Synthesis of Chiral β-Substituted Amides
作者:Mamen Rodríguez-Fernández、Xingchen Yan、Juan F. Collados、Paul B. White、Syuzanna R. Harutyunyan
DOI:10.1021/jacs.7b07344
日期:2017.10.11
are able to overcome the reactivity issues of unactivated enamides, known as the least reactive carboxylic acid derivatives, toward alkylation with organomagnesium reagents. Allowing unequaled chemo-reactivity and stereocontrol in catalytic asymmetric conjugate addition to enamides, the method is distinguished by its unprecedented reaction scope, allowing even the most challenging and synthetically
在这里,我们报告说,容易获得的基于甲硅烷基和硼的路易斯酸与手性铜催化剂结合能够克服未活化的烯酰胺(被称为反应性最低的羧酸衍生物)对有机镁试剂进行烷基化的反应性问题。在催化不对称共轭加成到烯酰胺中允许无与伦比的化学反应性和立体控制,该方法以其前所未有的反应范围而著称,即使是最具挑战性和合成上重要的甲基化也能以良好的产率和出色的对映选择性完成。该催化协议可耐受较宽的温度范围(-78 °C 至环境温度)和放大(10 g),而手性催化剂可以重复使用而不会影响整体效率。
Methyl 3-oxo-ω-fluorosulfonylperfluoropentanoate: a versatile trifluoromethylating agent for organic halides
作者:Qing-Yun Chen、Jian-Xing Duan
DOI:10.1039/c39930001389
日期:——
Methyl 3-oxo-ω-fluorosulfonylperfluoropentanoate FSO2CF2CF2OCF2CO2Me 1, prepared through the reaction of readily available ICF2CF2OCF2CF2SO2F and SO3 followed by MeOH, is a very convenient trifluoromethylatingagent; in the presence of copper(I) iodide, 1not only reacts with vinyl, benzyl allyl, phenyl iodides and bromides, but also with aryl chlorides to give the corresponding trifluoromethyl compounds
3-氧-ω-氟磺酰基全氟戊酸甲酯FSO 2 CF 2 CF 2 OCF 2 CO 2 Me 1是通过容易获得的ICF 2 CF 2 OCF 2 CF 2 SO 2 F和SO 3然后与MeOH反应制备的,非常方便三氟甲基化剂;在碘化铜(I)存在下,1不仅与乙烯基,苄基烯丙基,苯基碘化物和溴化物反应,而且与芳基氯化物反应,以中等至高收率得到相应的三氟甲基化合物;提出了可能的反应机理。
Fluoride-mediated selective cross-coupling reactions of alkyl halides and trimethyl(perfluoroalkyl)silanes, Me3SiRf (Rf=CF3, C2F5) in the absence of any catalysts
作者:Wieland Tyrra、Dieter Naumann、Silke Quadt、Sigrid Buslei、Yurii L. Yagupolskii、Mikhail M. Kremlev
DOI:10.1016/j.jfluchem.2007.02.017
日期:2007.7
A temperature range of −18 °C to room temperature was found to be effective for selective fluoride-mediated cross-couplingreactions of trimethyl(perfluoroalkyl)silanes, Me3SiCF3 and Me3SiC2F5, and alkyl halides, RX (X = Br, I) in the absence of any catalyst.
已发现在−18°C到室温的温度范围内对于三甲基(全氟烷基)硅烷Me 3 SiCF 3和Me 3 SiC 2 F 5以及烷基卤化物RX( X = Br,I)在没有任何催化剂的情况下。