2-Chloro-1,3-dimethylimidazolinium Chloride. 3. Utility for Chlorination, Oxidation, Reduction, and Rearrangement Reactions
摘要:
2-Chloro-1,3-dimethylimidazolinium chloride (1), which can act as a powerful dehydrating equivalent to DCC (2), is also applicable to chlorination, oxidation, reduction, and rearrangement under nearly neutral conditions. The utility of 1 for these reactions is described.
Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides
作者:Graham E. O'Mahony、Kevin S. Eccles、Robin E. Morrison、Alan Ford、Simon E. Lawrence、Anita R. Maguire
DOI:10.1016/j.tet.2013.08.063
日期:2013.11
in the copper-catalysed asymmetricoxidation of aryl benzyl, aryl alkyl and alkyl benzyl sulfides have been investigated. The presence of an aryl group directly attached to the sulfur is essential to afford sulfoxides with high enantioselectivities, with up to 97% ee for 2-naphthyl benzyl sulfoxide, the highest enantioselectivity achieved to date for copper-catalysed asymmetric sulfoxidation. In contrast
Nano cobalt ferrite catalyzed coupling reaction of nitroarene and alkyl halide: An odorless and ligand-free rout to unsymmetrical thioether synthesis
作者:Firouz Matloubi Moghaddam、Raheleh Pourkaveh
DOI:10.1016/j.catcom.2017.02.009
日期:2017.5
This study describes an odorless protocol for the synthesis of unsymmetrical sulfides via cobalt ferrite (CoFe2O4) catalyzed cross-coupling reaction of nitroarenes with alkyl halides in the presence of thiourea as sulfur source underligand-freeconditions. The catalyst was recycled using external magnetic field and reused for ten consecutive runs in the reaction of nitrobenzene, thiourea and benzyl
这项研究描述了在无配体条件下,以硫脲为硫源,通过钴铁氧体(CoFe 2 O 4)催化硝基芳烃与烷基卤化物的交叉偶联反应合成不对称硫化物的无味方案。使用外部磁场使催化剂再循环,并在硝基苯,硫脲和苄基溴的反应中连续十次重复使用,而活性没有明显损失。除了可磁分离之外,便宜和空气稳定是该催化系统的另一个重要特征。所有产物均以良好的产率和短的反应时间形成。
Histidine-functionalized chitosan–Cu(<scp>ii</scp>) complex: a novel and green heterogeneous nanocatalyst for two and three component C–S coupling reactions
chitosan, a novel applicable matrix was successfully prepared and investigated as a heterogeneousnanocatalyst for preparing diaryl sulfides and aryl benzyl thioethers. The Cu(II)-his@CS nanocatalyst was characterized by FT-IR, CHN, XRD, FE-SEM, TEM, EDX, ICP-AES and TG analysis. This novel copper nanocatalyst was used for two and three component C–Scoupling reactions of different arylhalides. The nanocatalyst
method is presented for the asymmetric oxidation of sulfides with H2O2, utilizing a pre-formed manganese complex. Just in the presence of a low catalytic amount of carboxylic acid (CA), a variety of sulfide substrates, including aryl alkyl, aryl benzyl and cyclic sulfides, reacted to form chiral sulfoxides in high yields (up to 95%) and excellent enantioselectivities (>99% ee) under mild conditions. Moreover
提出了一种利用预先形成的锰配合物,用H 2 O 2对硫化物进行不对称氧化的简便,环保的方法。仅在低催化量的羧酸(CA)存在下,各种硫化物底物(包括芳基烷基,芳基苄基和环状硫化物)就以高收率(高达95%)和出色的对映选择性反应形成手性亚砜( ee> 99%)。此外,该方法的实用性已经通过埃索美拉唑和阿苯达唑亚砜(ABZO)的合成得到证明。