New Synthetic Approach for Optically Active Polymer Bearing Chiral Cyclic Architecture: Combination of Asymmetric Allylic Amidation and Ring-Closing Metathesis Reaction

New Synthetic Approach for Optically Active Polymer Bearing Chiral Cyclic Architecture: Combination of Asymmetric Allylic Amidation and Ring-Closing Metathesis Reaction
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具有手性环状结构的光学活性聚合物的新合成方法:不对称烯丙基酰胺化和闭环复分解反应的组合

DOI:
10.1021/acs.macromol.5b02067
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发表时间:
2015
期刊:
影响因子:
5.5
通讯作者:
and K. Onitsuka
and K. Onitsuka
中科院分区:
化学1区
文献类型:
--
作者:
N. Kanbayashi;T. Okamura;and K. Onitsuka

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介绍了一种新的含手性环结构光活性聚合物的合成方法。该聚合物是由平面手性钌(Cp’ru)配合物催化的不对称烯丙基酰胺化反应和合环复分解(RCM)反应合成的。我们设计了含有烯丙基氯和含有烯烃片段的n -烷氧酰胺的双功能单体,得到的聚合物在每个单体单元中提供两个烯烃片段用于RCM反应。这些单体在Cp’ru催化剂的催化下进行了定量聚合,得到了期望的具有高区域选择性和对映选择性的光学活性聚合物。所得聚合物在第二代Hoveyda-Grubbs催化剂催化下,通过RCM很容易地将每个单体单元转化为一个手性环结构(3,6-二氢- 2h -恶嗪)。此外,该聚合体系适用于各种单体,提供具有多种类型的主链和侧链结构的光学活性聚合物。
A new synthetic approach for optically active polymer-bearing chiral cyclic architecture is described. The polymer is prepared by a combination of asymmetric allylic amidation catalyzed by planar-chiral ruthenium (Cp′Ru) complexes and ring-closing metathesis (RCM) reaction. We have designed bifunctional monomers bearing allylic chloride andN-alkoxyamide possessing an olefinic moiety, and the resulting polymer provides two olefinic moieties for RCM reactions in each monomer unit. These monomers are smoothly polymerized by Cp′Ru catalyst with quantitative conversion to afford the desired optically active polymer with high regio- and enantioselectivities. The resulting polymer is easily converted to one chiral cyclic structure (3,6-dihydro-2H-oxazine) per monomer unit via RCM catalyzed by the second-generation Hoveyda–Grubbs catalyst. Additionally, the polymerization system is applicable to various monomers, which afford optically active polymers possessing several types of main chain and side chain structures.
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