Synthesis of an optically active polymer containing a planar phthalimide backbone by asymmetric polymerization

Synthesis of an optically active polymer containing a planar phthalimide backbone by asymmetric polymerization
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通过不对称聚合合成含有平面邻苯二甲酰亚胺主链的光学活性聚合物

DOI:
10.1039/d0py01073a
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发表时间:
2020
期刊:
影响因子:
4.6
通讯作者:
Onitsuka Kiyotaka
Onitsuka Kiyotaka
中科院分区:
化学2区
文献类型:
--
作者:
Kanbayashi Naoya;Saegusa Marina;Ishido Yuki;Okamura Taka-aki;Onitsuka Kiyotaka

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不对称聚合是一种很有前途的方法,可以构建主链上含有不对称碳的复杂主链。在这里,我们报道了一种新型的聚合物主链的精确设计和合成,该主链通过平面-手性环戊二烯-Ru配合物催化的邻苯二甲酰亚胺单体的不对称聚合反应来诱导螺旋结构。当tetrakis[3,5-bis(trifluoromethyl)phenyl]borate钠作为添加剂时,聚合反应具有很高的区域选择性和对映体选择性,生成了一种由主链上具有对映体富集型不对称碳的平面型邻苯二甲酰亚胺主链组成的光学活性聚合物。聚合物的每个单体单元中的末端烯烃可以通过硫醇-烯反应得到不同的取代基。CD和UV光谱方法和构象研究表明,平面邻苯二甲酰亚胺主链根据主链不对称碳周围的两个扭转角确定的局部构象紧密折叠,形成圆柱形的41-螺旋结构,由于邻苯二甲酰亚胺主链上的疏水作用,该结构在极性溶剂中稳定。
Asymmetric polymerization is a promising method for constructing sophisticated backbones that contain asymmetric carbons on the main chain. Herein, we report the precise design and synthesis of a novel polymer backbone that induces a helical structure through asymmetric polymerization reactions of a phthalimide-based monomer catalyzed by a planar-chiral cyclopentadienyl–ruthenium complex. When sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate was used as an additive, the polymerization proceeded with high regio- and enantioselectivity, producing an optically active polymer composed of a planar phthalimide backbone with enantiomerically enriched asymmetric carbons on the main chain. The terminal olefin in each monomer unit of the polymer could take on various substituents through thiol–ene reactions. CD and UV spectroscopic methods and conformational studies showed that the planar phthalimide backbones are tightly folded according to the local conformation determined by the two torsion angles around the asymmetric carbons of the main chain, resulting in the construction of a cylindrical 41-helical structure in solution, which was stable in polar solvents due to the solvophobic effect on the phthalimide backbones.
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