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 Selective Sulfoxidation of Allylic and Vinylic Sulfides by Hydrogen Peroxide Using a Flavin as Catalyst
作者:Auri A. Lindén、Lars Krüger、Jan-E. Bäckvall
DOI:10.1021/jo034273z
日期:2003.7.1
sulfone was detected). No epoxidation of double bonds or interference with other functional groups was observed under the reaction conditions. The general applicability was demonstrated by the selective oxidation of various allylic and vinylic sulfides having different electronic properties. A number of functionalities including hydroxy, acetoxy, amino, silyloxy, and formyl groups are tolerated under these
The reaction of cyclic sulfides with benzyne generated from 2-carboxybenzenediazonium chloride affords ω-chloroalkyl phenyl sulfides in good yields. A similar type of reaction was also observed with acyclic sulfides.
2,3-Sigmatropic Rearrangement of Sulfonium Ylides Generated by Addition of Samarium Carbenoids
作者:Munetaka Kunishima、Daisuke Nakata、Chikako Goto、Kazuhito Hioki、Shohei Tani
DOI:10.1055/s-1998-1979
日期:1998.12
Allylic sulfides are transformed into homoallylic sulfides with complete allylic inversion by treatment with SmI2 and CH2I2 in THF. The reaction will involve allylic sulfonium ylides as an intermediate, which undergoes 2,3-rearrangement.
Chemoselective sulfur oxidation of allylic sulfides containing double bonds of high electron density due to multiple alkyl substituents or extended conjugation was developed using the composite metal oxidecatalyst, LiNbMoO(6), without any epoxidation of the electron-rich double bond(s). Selectiveoxidation to either the corresponding sulfoxides or the sulfones was realized by controlling the stoichiometry