Silver-catalyzed fluoroalkylation of thiols using fluoroalkanesulfinates
作者:Jing-jing Ma、Qi-ran Liu、Guo-ping Lu、Wen-bin Yi
DOI:10.1016/j.jfluchem.2016.11.010
日期:2017.1
A practical sliver-catalyzed fluoroalkylation of aryl-, heteroaryl- and allcylthiols has been developed. The reaction has a good functional-group tolerance and excellent selectivity. A variety of stable and solid fluoroalkanesulfinates including di- and perfluoroalkanesulfinates can be employed. This methodology provides a straightforward and streamlined access to perfluoroallcylthiolated organic molecules.[GRAPHICS](C) 2016 Elsevier B.V. All rights reserved.
Oxidation of Sulfur-Containing Compounds with HOF·CH<sub>3</sub>CN
作者:Shlomo Rozen、Yifat Bareket
DOI:10.1021/jo961862e
日期:1997.3.1
The HOF . CH3CN complex, easily prepared by passing F-2 through aqueous acetonitrile, is an exceptionally efficient oxygen transfer agent. All types of sulfides have been oxidized to sulfones in excellent yields, in a few minutes at room temperature. The reaction proceeds through the formation of sulfoxides which at low temperatures of around -75 degrees C could be isolated in good yields. It was demonstrated through a reaction with thianthrene 5-oxide (20) that HOF . CH3CN is strongly electrophilic in nature. Sulfides with an electron-depleted sulfur atom such as perfluoroalkyl or aryl sulfides, which could not be well oxidized by any other method, were also efficiently converted to the corresponding sulfones in minutes. Thiophenes are generally hard to oxidize to the corresponding S-dioxides since the conditions required by the orthodox oxidants encourage consecutive typical ene and diene reactions. HOF . CH3CN requires;short reaction times and low temperatures, thus enabling the isolation of thiophene dioxides, some of which could not be made by any other way. It seems that apart from unprotected amines, other functional groups such as aromatic rings, ketones, hydroxyls, and ethers do not interfere, since the sulfur atom reacts considerably faster.
Two-Photon Polarity Probes Built from Octupolar Fluorophores: Synthesis, Structure-Properties Relationships, and Use in Cellular Imaging
作者:Céline Le Droumaguet、Aude Sourdon、Emilie Genin、Olivier Mongin、Mireille Blanchard-Desce
DOI:10.1002/asia.201300735
日期:2013.12
A series of octupolar fluorophores built from a triphenylamine (TPA) core connected to electron‐withdrawing (EW) peripheral groups through conjugated spacers has been synthesized. Their photoluminescence, solvatochromism, and two‐photon absorption (2PA) properties were systematically investigated to derive structure–property relationships. All derivatives exhibit two 2PA bands in the 700–1000 nm region:
efficient one‐pot synthesis of S‐perfluoroalkylated NH‐sulfoximines from sulfides has been developed using phenyliodine diacetate (PIDA) and ammonium carbamate. Remarkable rate enhancement with trifluoroethanol was observed, presumably due to H‐bonding effects. These mild and metal‐free conditions are compatible with ‐CH2F, ‐CFCl2, ‐CF2H, ‐CF2Br, ‐C4F9, and ‐CF3 groups, in both the alkyl‐ and aryl series. Based
使用二碘苯基碘二乙酸酯(PIDA)和氨基甲酸铵开发了一种通用的由硫化物有效地单锅合成S-全氟烷基化NH-亚磺酰亚胺的方法。观察到三氟乙醇显着提高了速率,这可能是由于氢键作用所致。这些温和且无金属的条件在烷基和芳基系列中均与-CH 2 F,-CFCl 2,-CF 2 H,-CF 2 Br,-C 4 F 9和-CF 3基团兼容。根据19 F NMR分析,λ 6,提出了-acetoxysulfanenitrile中间体。