咪唑型离子液负载手性双膦配体pyrphos的合成及不对称氢化研究

doi:10.6023/cjoc201305042

有机化学 ›› 2013, Vol. 33 ›› Issue (10): 2143-2147.DOI: 10.6023/cjoc201305042 上一篇下一篇

研究论文

咪唑型离子液负载手性双膦配体pyrphos的合成及不对称氢化研究

易兵^a,b, 武高峰^b, 周威^b, 何华平^a

a 湖南工程学院化学化工学院生态纺织材料及染整新技术湖南省高校重点实验室湘潭 411104;
b 湘潭大学化学学院环境友好化学与应用省部共建教育部重点实验室湘潭 411105

收稿日期:2013-05-30 修回日期:2013-07-06 发布日期:2013-07-10
通讯作者: 易兵 E-mail:bingyi2004@126.com
基金资助:
国家自然科学基金(Nos. 21172064, 20972045);湖南省自然科学基金(No. 10JJ2006)和湖南省教育厅重点(No. 10A022)资助项目

Study on Synthesis of Imidazolium-Tagged Chiral Pyrphos Diphosphine Ligands and Their Applications in Asymmetric Hydrogenation

Yi Bing^a,b, Wu Gaofeng^b, Zhou Wei^b, He Huaping^a

a Key Laboratory of Ecological Textile Materials & Novel Dying and Finishing Technology, Hunan Provincial Education Department, School of Chemistry & Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104;
b Key Laboratory of Environmentally Friendly Chemistry and Applications, Ministry of Education, School of Chemistry, Xiangtan University, Xiangtan 411105

Received:2013-05-30 Revised:2013-07-06 Published:2013-07-10
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21172064, 20972045), the Natural Science Foundation of Hunan Province (No.10JJ2006), and the Key Scientific Research Fund of Hunan Provincial Education Department (No. 10A022).

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1. 咪唑型离子液负载手性双膦配体pyrphos的合成及不对称氢化研究.PDF(420KB)

摘要/Abstract

采用N-甲基咪唑类离子液体为载体, 以C₂轴手性的双膦配体pyrphos[(R,R)-3,4-bis(diphenylphosphino)pyr-rolidine]为嫁接对象, 研究了N-甲基咪唑型离子液体负载手性双膦配体pyrphos的合成方法, 确定了目标分子的合成路线及提纯方法, 对目标化合物和相关中间体进行了¹H NMR, ¹³C NMR, ³¹P NMR, IR和HRMS等表征. 研究了该类配体与金属铑组成的催化剂在脱氢氨基酸的不对称氢化反应中的应用, 结果表明: 采用[bmim]BF₄/MeOH混合溶剂, 以N-甲基咪唑四氟合硼酸盐离子液负载的pyrphos膦配体与[Rh(COD)₂]BF₄形成的配合物为催化剂, 在α-乙酰氨基肉桂酸的不对称氢化反应中获得了与小分子催化剂相似的催化性能, 产物的转化率为100%, 对映选择性为97.0%. 催化剂循环使用4次, 活性和对映选择性基本不变.

关键词: 不对称氢化, 双膦配体, 咪唑型离子液体, 负载, 催化剂循环利用

Herein we developed a facile method for preparation of a new functionalized ionic liquids supported chiral diphosphine ligands by grafting homogeneous chiral pyrphos[(R,R)-3,4-bis(diphenylphosphino)pyrrolidine] ligand with C₂ axis onto imidazolium ionic liquids supports. Firstly the linker groups having halogen atoms were attached to amino group in pyrphos, and then reacted with N-methylimidazole. The other anion-containing chiral ligands located on ionic liqids (ILs) were synthesized via ion exchange technique. These ligands and the related intermediates were purified by flash column chromatography and were characterized by ¹H NMR, ¹³C NMR, ³¹P NMR, IR and HRMS techniques. All results were consistent with the compounds synthesized. Then we focused on the catalytic performances and the feasibility of catalyst recycling in rhodium-catalyzed asymmetric hydrogenation of prechiral dehydroamino acid. The results showed that the catalyst generated in situ by imidazolium-tagged pyrphos ligands with BF₄ as counteranion and[Rh(COD)₂]BF₄ exhibited high catalytic activity and enantioselectivity in asymmetric hydrogenation of α-acetamido cinnamic acid in[bmim]BF₄/MeOH cosolvent systems, which was similar to the molecule catalyst. The conversion is 100%, and the ee value is up to 97.0%. Moreover, the catalyst could be reused four times without significant loss of activity and enantioselectivity.

Key words: asymmetric hydrogenation, diphosphine ligand, imidazolium ionic liquid, immobilization, catalyst recycling

引用此文

易兵, 武高峰, 周威, 何华平. 咪唑型离子液负载手性双膦配体pyrphos的合成及不对称氢化研究[J]. 有机化学, 2013, 33(10): 2143-2147.

Yi Bing, Wu Gaofeng, Zhou Wei, He Huaping. Study on Synthesis of Imidazolium-Tagged Chiral Pyrphos Diphosphine Ligands and Their Applications in Asymmetric Hydrogenation[J]. Chin. J. Org. Chem., 2013, 33(10): 2143-2147.

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咪唑型离子液负载手性双膦配体pyrphos的合成及不对称氢化研究

Study on Synthesis of Imidazolium-Tagged Chiral Pyrphos Diphosphine Ligands and Their Applications in Asymmetric Hydrogenation

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