Etude de la regiochimie et de lastereochimie de l'addition conjuguee de sulfoxydes et d'oxydes de phosphine d'alcene-2yles, de phosphonates et de sulfoxydes d'allyles et de dimethyl-3,3 allyles, lithiees a des enones cycliques
Synthesis of Sulfoxides by the Hydrogen Peroxide Induced Oxidation of Sulfides Catalyzed by Iron Tetrakis(pentafluorophenyl)porphyrin: Scope and Chemoselectivity
The oxidation of sulfides with H2O2 catalyzed by iron tetrakis(pentafluorophenyl)porphyrin in EtOH is an efficient and chemoselective process. With a catalyst concentration 0.03−0.09% of that of the substrate, sulfoxides are obtained with yields generally around 90−95% of isolated product. With vinyl and allyl sulfides, no epoxidation is observed. With a catalyst concentration between 0.09% and 0.25%
四(五氟苯基)卟啉铁在EtOH中催化的H 2 O 2氧化硫化物是一种有效的化学选择过程。在催化剂浓度为底物浓度的0.03-0.09%的情况下,获得的亚砜的收率通常约为分离产物的90-95%。对于乙烯基和烯丙基硫化物,未观察到环氧化。催化剂浓度为底物浓度的0.09%至0.25%,可以以几乎定量的产率获得砜,并且在亚砜的合成中观察到相同的高化学选择性。
Highly chemoselective synthesis of aryl allylic sulfoxides through calcium hypobromite oxidation of aryl allylic sulfides
作者:Vittorio Pace、Laura Castoldi、Wolfgang Holzer
DOI:10.1016/j.tetlet.2011.12.046
日期:2012.2
A highlychemoselectiveoxidation of widely substituted aryl allylic sulfides, prepared by allylation of arylthioethers with KF-Celite, to the corresponding aryl allylic sulfoxide was achieved by employing calcium hypobromite. Neither over-oxidation to sulfones nor halogenation of the aromatic rings was observed. The protocol may be successfully applied for the oxidation of substituted allylic systems
oxy-1-butene and 4-chloro-1-ethynyl-1,5-dimethyl-5-hexenyl acetate, respectively. In contrast, 3-methyl-2-butenyl derivatives 2d–f and 3-methyl-2-butenoic acid afforded a variety of products such as chlorohydrin, vinylchloride, and sulfoxide other than ene-type products, suggesting that the functional group of R in 2 affects the reaction cou...
Efficient and Selective Sulfoxidation by Hydrogen Peroxide, Using a Recyclable Flavin−[BMIm]PF<sub>6</sub> Catalytic System
作者:Auri A. Lindén、Mikael Johansson、Nina Hermanns、Jan-E. Bäckvall
DOI:10.1021/jo060274q
日期:2006.5.1
A new flavin catalyst 2 immobilized in an ionic liquid ([BMIm]PF6) was used for the highly selective oxidation of sulfides to sulfoxides by hydrogenperoxide. The sulfoxides were obtained in good to high yields and high selectivity without any detectable overoxidation to sulfone. The catalyst in the ionic liquid was recycled up to seven times without loss of activity or selectivity.
Spin Trapping Studies of Peroxyl Radicals. Detection of the Reactive Intermediates for Oxidation Generated from O<sub>2</sub><sup>−•</sup>and Sulfonyl, Sulfinyl, and Phosphoryl Chlorides
作者:Yong Hae Kim、Sang Chul Lim、Mikio Hoshino、Yasuo Ohtsuka、Takeshi Ohishi
DOI:10.1246/cl.1989.167
日期:1989.1
The spintrappingstudies by ESR have demonstrated that O2−• efficiently reacts with 2-nitrobenzenesulfonyl chloride, 2-nitrobenzenesulfinyl chloride, and diphenylphosphoryl chloride, to result in the formation of their peroxyl radicals, some of which have been key intermediates for site-selective oxidation of certain organic molecules and argued whether they exist as anion and/or radical form.