Copper-catalyzed asymmetric sulfoxidation of aryl benzyl and aryl alkyl sulfides, using aqueous hydrogen peroxide as the oxidant, has been investigated. A relationship between the steric effects of the sulfide substituents and the enantioselectivity of the oxidation has been observed, with up to 93% ee for 2-naphthylmethyl phenyl sulfoxide, in modest yield in this instance (up to 30%). The influence
(PhCH<sub>2</sub>PPh<sub>3</sub>)<sup>+</sup>Br<sub>3</sub> <sup>−</sup>: A Versatile Reagent for the Chemoselective Oxidation of Sulfides to Sulfoxides
作者:F. Shirini、G. H. Imanzadeh、A. R. Mousazadeh、A. R. Aliakbar
DOI:10.1080/10426500903176539
日期:2010.7.30
Benzyltriphenylphosphonium tribromide (BTPTB), as a stable solid reagent, is easily prepared by the reaction of benzyltriphenylphosphonium bromide with Br2. This reagent can be used as an efficient reagent for the chemoselective oxidation of dialkyl and aryl-alkyl sulfides to their corresponding sulfoxides in the presence of diaryl sulfides and primary alcohols. All reactions were performed in a refluxing
Synthesis of <i>N</i>-alkylated 2-pyridones through Pummerer type reactions of activated sulfoxides and 2-fluoropyridine derivatives
作者:Gang Hu、Jiaxi Xu、Pingfan Li
DOI:10.1039/c8ob00860d
日期:——
excellent yields through a one-pot procedure involving either normal or interrupted Pummerer reactions between triflic anhydride activated sulfoxides and 2-fluoropyridine derivatives, followed by hydrolysis. This is a rare case that uses 2-fluoropyridine as a nucleophile in Pummerer type reactions.
Selective Oxidation of Sulfides to Sulfoxides and Sulfones Using<b><i>n</i></b>-Butyltriphenylphosphonium Dichromate (Bu<sup><i>n</i></sup>PPh<sub>3</sub>)<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>in the Presence of Aluminium Chloride in Solution and Under Microwave Irradiation
sulfones in excellent yields using n-butyltriphenylphosphonium dichromate (BTPPDC) in the presence of aluminium chloride in acetonitrile solution and under microwave irradiation. In addition, selective oxidation of sulfides in the presence of functional groups such as a carbon–carbon double bond, ketone, oxime, aldehyde, ether, and acetal can be considered as a noteworthy advantage of this method.
Novel dioxomolybdenum complexes containing ONO-tridentate Schiff base ligands derived from 4-aminobenzohydrazide: synthesis, spectral characterization, and application as efficient homogeneous catalysts for selective sulfoxidation
作者:Hadi Kargar、Mehdi Fallah-Mehrjardi
DOI:10.1007/s13738-021-02282-0
日期:2021.12
Novel dioxomolybdenum Schiff base complexes, [MoO2(Ln)(CH3OH)], were synthesized by the reaction of MoO2(acac)2 and ONO donor Schiff base ligands (H2Ln) derived by the condensation of 4-aminobenzohydrazide and substituted salicylaldehydes. The synthesized ligands and their complexes were characterized by various spectroscopic techniques like FT-IR, 1H NMR, 13C NMR, and elemental analysis (CHN). The
新型二氧钼席夫碱配合物 [MoO 2 (L n )(CH 3 OH)] 是通过 MoO 2 (acac) 2和 ONO 供体席夫碱配体 (H 2 L n )的反应合成的,该配体由 4 -氨基苯甲酰肼和取代的水杨醛。合成的配体及其配合物通过各种光谱技术如 FT-IR、1 H NMR、13C NMR和元素分析(CHN)。复合物中中心金属原子周围的几何形状被认为是扭曲的八面体。此外,通过在叔丁基氢过氧化物存在下在回流条件下在 1,2-二氯乙烷中氧化芳基和烷基硫化物来研究配合物的催化效率。该方法具有收率高、反应时间短、选择性好等优点,可生成相应的亚砜而不会过度氧化成砜。