Suzuki‐Miyaura coupling of haloarenes is the most widely used protocol for the synthesis of biphenyls. Organosulfur compounds are promising electrophiles since they are abundant in nature and versatile in organic synthesis. We report here the desulfinylative Suzuki‐Miyaura coupling of aryl sulfoxides with phenylboronic acids using bench‐stable nickel/5‐(2,4,6‐triisopropylphenyl)imidazolylidene[1,5‐a]pyridines
卤代芳烃的Suzuki-Miyaura偶联是联苯合成中使用最广泛的方案。有机硫化合物是有前途的亲电子试剂,因为它们性质丰富且有机合成用途广泛。我们在此报告使用稳定的镍/ 5-(2,4,6-三异丙基苯基)咪唑基亚甲基[1,5- a ]吡啶作为催化剂将芳基亚砜与苯基硼酸的脱亚磺酰基铃木-宫浦偶合。配体易于从常见的商业化学品制备。该方法适用于对称和不对称的芳基亚砜,并且以高达94%的收率获得了一系列带有各种官能团的联苯。
Amination of diaryl sulfoxides with anilines and alkylamines has been accomplished under palladium/N-heterocyclic carbene (NHC) catalysis. Owing to its electron deficiency, the leaving arenesulfenate anion would be smoothly released from the palladium center to result in uneventful catalyst turnover under milder reaction conditions in comparison with previous C–S bond amination reactions. This amination
One‐step Oxidative Monofluorination of Electron‐Deficient Sulfoxides to Access Highly Lewis Acidic Sulfur(VI) Cations
作者:Jordan Berreur、Alberto Diez‐Varga、Augustin Manel、Frédéric R. Leroux、Armen Panossian
DOI:10.1002/chem.202202564
日期:2022.12.9
acidic fluorosulfoxonium cations can be prepared in a one-step, chloride promoter-free fashion from electron-deficient sulfoxides using [FXe][OTf]. The latter is prepared by reaction of XeF2 with TMS-OTf, thus representing an inversion of the previously described Umpolung strategy, which failed to convert the same sulfoxides efficiently. The Lewis acidities of the obtained cations have been probed experimentally
Reaction of simple arenes with FSO3H.cntdot.SbF5/SO2: one-pot synthesis of aromatic sulfoxides. Mechanistic aspects and synthetic utility
作者:Kenneth Khosrow Laali、Devdatt S. Nagvekar
DOI:10.1021/jo00005a037
日期:1991.3
In a simple one-pot reaction, mono-, di-, tri-, and polyalkylbenzenes, isomeric alkylhalobenzenes, and fluoro-, (trifluoromethyl)-, and 1,3,5-trifluorobenzene were converted to their corresponding diaryl sulfoxides with FSO3H.SbF5 (1:1) (magic acid)/SO2. Dependency of the yields on the acidity (H0) and the arene structure was demonstrated. Reduction of the formed sulfoxide was also observed as a minor pathway to give diaryl sulfide. The reduction is superacid-catalyzed, and protonated sulfoxides are the key intermediates en route to sulfides. Protonation of several functionalized diaryl sulfoxides was also studied in magic acid/SO2 under stable ion conditions. Unlike the parent diphenyl sulfoxide, which is S-protonated, alkyl-, fluoro-, and trifluoromethyl-substituted diaryl sulfoxides O-protonate to give long-lived sulfoxonium ions. The proposed mechanism for the arene/superacid/SO2 system involves sulfination of the arenium ions, O-protonation of the resulting sulfinic acid, dehydration of the oxonium ion ''ArSO+'' and arylation. In the absence of SO2, the fluorosulfonation, ionization, arylation path becomes dominant. The scope of the reaction is sufficiently broad to be synthetically useful. The methodology is also applicable to unsymmetrical (mixed) diaryl sulfoxides.