N-Bromosuccinimideand Iodine Catalyzed Highly Efficient Deoxygenation ofSulfoxides to Thioethers Using 3-Mercaptopropionic Acid under Mild ReactionConditions
Selective Oxidation of Sulfides to Sulfoxides Using 30% Hydrogen Peroxide Catalyzed with a Recoverable Silica-Based Tungstate Interphase Catalyst
摘要:
Various types of aromatic and aliphatic sulfides are selectively oxidized to sulfoxides and sulfones in good to excellent yields using 30% H2O2 in the presence of catalytic amounts of a novel recoverable silica-based tungstate interphase catalyst at room temperature. The catalyst can be recovered and reused for at least eight reaction cycles under the described reaction conditions without considerable loss of reactivity.
Rapid, Efficient and Chemoselective Deoxygenation of Sulfoxides to Thioethers Using NaBH<sub>4</sub>/I<sub>2</sub>
作者:Babak Karimi、Daryoush Zareyee
DOI:10.1055/s-2003-37349
日期:——
Sodium borohydride in the presence of iodine in anhydrous THF converts a range of structurally different sulfoxides to their thioethers in excellent yields. It has been found that chemoselective deoxygenation of sulfoxides can be achieved in the presence of other reducible functional groups such as esters, nitriles and double bonds.
Rhodium-catalyzed enantioselective C–H alkynylation of sulfoxides in diverse patterns: desymmetrization, kinetic resolution, and parallel kinetic resolution
作者:Lingheng Kong、Yun Zou、Xiao-Xi Li、Xue-Peng Zhang、Xingwei Li
DOI:10.1039/d2sc05310a
日期:——
Rhodium-catalyzedenantioselective C–H alkynylation of achiral and racemic sulfoxides is disclosed with alkynyl bromide as the alkynylating reagent. A wide range of chiral sulfoxides have been constructed in good yield and excellent enantioselectivity (up to 99% ee, s-factor up to > 500) via desymmetrization, kinetic resolution, and parallel kinetic resolution under mild reaction conditions. The high
Oxidation By Manganese Dioxide (mno<sub>2</sub>) Catalysed With H<sub>2</sub>SO<sub>4</sub>/silica gel. Efficient solvent-Free Oxdation Of Thioethers To Their Corresponding Sulfoxides
作者:H. Firouzabadi、M. Abbasi
DOI:10.1080/00397919908086128
日期:1999.5
H2SO4 mixed with silica gel (1:2) by weight produces a white powder which is an effective catalyst for the oxidation of thioethers to their corresponding sulfoxide by MnO2 under solvent-free conditions.
Enantioselective inclusion of chiral alkyl aryl sulfoxides in a supramolecular helical channel consisting of an enantiopure 1,2-amino alcohol and an achiral carboxylic acid
The enantio selective clathrate formation of alkyl aryl sulfoxides 4 was achieved with dissymmetric one-dimensional helical channels created in two-component hosts consisting of (1R,2S)-2-amino-1,2-diphenylethanol 1 and an achiral carboxylic acid, p-tert-butylbenzoic acid 2, or 2-anthraquinonecarboxylic acid 3. X-ray crystallographic analyses showed that the host framework (1R,2S)-1.3 in the single crystal of a clathrate with methyl p-methylphenyl sulfoxide 4n [(1R,2S)-1.3.4n (single)] maintained a supramolecular helical array as those of the solvent-included single crystals (1R,2S)-1.3-EtOH(single) and (1R,2S)-1-3-H2O.THF(single), while the guest 4n molecules were highly disordered. Moreover, the X-ray powder diffraction pattern of (1R,2S)-1-3-4n(clathrate) obtained through the clathrate formation demonstrated that the molecular arrangements of (1R,2S)-1, 3, and 4n were not the same as those which appeared in (1R,2S)-1.3.4n(single); the channel was enlarged. These results are consistently explained by assuming the dynamic motion of the framework (1R,2S)-1-3 to achieve widely applicable clathrate formation. (c) 2007 Elsevier Ltd. All rights reserved.
TRIMETHYLCHLOROSILANE (TMCS) CATALYZED EFFICIENT REDUCTION OF SULFOXIDES TO THIOETHERS USING 3-MERCAPTOPROPIONIC ACID UNDER MILD REACTION CONDITIONS
作者:Babak Karimi、Daryoush Zareyee
DOI:10.1080/10426500490257050
日期:2004.1
A variety of alkyl and aryl sulfoxides were successfully deoxygenated using 3-mercaptopropionic acid as reducing agent and a catalytic amount of trimethylchlorosilane (10-20 mol%) in CH3CN at ambient temperature.