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首页> 外文期刊>RSC Advances >Cooperative chiral salen Ti-IV catalysts with built-in phase-transfer capability accelerate asymmetric sulfoxidation in water
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Cooperative chiral salen Ti-IV catalysts with built-in phase-transfer capability accelerate asymmetric sulfoxidation in water

机译：具有内置相转移能力的合作手性盐酸盐Ti-IV催化剂在水中加速不对称磺氧化

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摘要

A series of cooperative chiral salen Ti-IV catalysts with inherent phase-transfer capability were prepared by covalently bridging double chiral salen Ti-IV units with various polyethylene glycol (PEG)-based dicationic ionic liquid (IL) linkers. Characterization results suggested the presence of polyether-based IL spacers and intact active sites in the catalysts. The polyether-based dicationic IL spacer not only enforced an intramolecular, cooperative reaction pathway favored for the asymmetric suloxidation, but also endowed the bimetallic catalysts with built-in phase transfer capability. High yields of chiral sulfoxides (in the range of 74-90%) with excellent ee values (in the range of 85-91%) were achieved within 45 min when the asymmetric oxidation of methyl phenyl sulfide, methyl p-methoxyphenyl sulfide, and methyl o-methoxyphenyl sulfide were performed in water. The catalytic efficiency was significantly higher than that over neat complex (yields, 10-16% and ee values, 77-79%). More attractively, the phase transfer catalysts could be facilely recovered by solvent precipitation for efficient reuse.
机译：通过共价桥接具有各种聚乙二醇（PEG）的DICTICIC离子液体（IL）接头，通过共价桥接双手性盐酸Ti-IV单元来制备具有固有相转移能力的一系列合作手性盐酸Ti-IV催化剂。表征结果表明存在基于聚醚的IL间隔物和催化剂中的完整活性位点。基于聚醚的DICTIXIC IL间隔物不仅强制于对不对称氧化的分子内的合作反应途径，而且赋予了具有内置相转移能力的双金属催化剂。在45分钟内，在45分钟内在45分钟内在45分钟内获得高产量的手性亚砜（在74-90％的范围内），当时45分钟，当甲基硫化物，甲基甲氧基苯基硫化物的不对称氧化时，实现在水中进行甲基O-甲氧基苯基硫化物。催化效率明显高于整齐的络合物（产率，10-16％和EE值，77-79％）。更吸引人，相转移催化剂可以通过溶剂沉淀进行溶剂沉淀来施加有效再利用。

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  • 来源
    《RSC Advances》 |2016年第29期|共8页
  • 作者

    Zhao Guangwu; Tan Rong; Zhang Yaoyao; Luo Xuanfeng; Xing Chen; Yin Donghong;

  • 作者单位

    Hunan Normal Univ Key Lab Chem Biol &

    Tradit Chinese Med Res Key Lab Assembly &

    Applicat Organ Funct Mol Minist Educ Changsha 410081 Hunan Peoples R China;

    Hunan Normal Univ Key Lab Chem Biol &

    Tradit Chinese Med Res Key Lab Assembly &

    Applicat Organ Funct Mol Minist Educ Changsha 410081 Hunan Peoples R China;

    Hunan Normal Univ Key Lab Chem Biol &

    Tradit Chinese Med Res Key Lab Assembly &

    Applicat Organ Funct Mol Minist Educ Changsha 410081 Hunan Peoples R China;

    Hunan Normal Univ Key Lab Chem Biol &

    Tradit Chinese Med Res Key Lab Assembly &

    Applicat Organ Funct Mol Minist Educ Changsha 410081 Hunan Peoples R China;

    Hunan Normal Univ Key Lab Chem Biol &

    Tradit Chinese Med Res Key Lab Assembly &

    Applicat Organ Funct Mol Minist Educ Changsha 410081 Hunan Peoples R China;

    Hunan Normal Univ Key Lab Chem Biol &

    Tradit Chinese Med Res Key Lab Assembly &

    Applicat Organ Funct Mol Minist Educ Changsha 410081 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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