Enantiodifferentiating photoisomerization of cyclooctene included and sensitized by benzoate modified β-cyclodextrin derivatives: switching of product chirality by solvent
作者:Guangxun Li、Zhizhong Wang、Runhua Lu、Zhuo Tang
DOI:10.1016/j.tetlet.2011.04.001
日期:2011.6
has been investigated in the enantiodifferentiating photoisomerization of cyclooctene(1Z), sensitized by benzoate modified β-cyclodextrin derivatives bearing nitrogen, oxygen or sulfur substituents. The enantiomeric excess (ee) and E/Z ratio of reaction products were susceptible to the concentration of methanol in the aqueous solution, which could switch to the chirality of product unprecedentedly.
在对不饱和光敏化环辛烯(1Z)的光致异构化过程中,已经研究了溶剂效应,该光敏化是通过苯甲酸酯修饰的带有氮,氧或硫取代基的β-环糊精衍生物敏化的。反应产物的对映体过量(ee)和E / Z比容易受到水溶液中甲醇浓度的影响,这可能会前所未有地转变为产物的手性。进一步的研究表明,改性的CD在1Z的甲醇水溶液中的构象对改性CD的苯甲酸酯部分的取代基和甲醇浓度均高度敏感。溶剂含量代表了一种新的通用工具,可以有效地控制不对称光化学反应,其中可以通过简单地改变反应溶剂的甲醇含量而不是合成对映体敏化剂来改变产品的手性。