Switched enantioselectivity by solvent components and temperature in photocyclodimerization of 2-anthracenecarboxylate with 6(A),6(x)-diguanidio-gamma-cyclodextrins
Switched enantioselectivity by solvent components and temperature in photocyclodimerization of 2-anthracenecarboxylate with 6(A),6(x)-diguanidio-gamma-cyclodextrins
复制标题
2-蒽甲酸酯与 6(A),6(x)-二胍基-γ-环糊精光环二聚反应中溶剂组分和温度改变对映选择性
DOI：
10.1016/j.cclet.2017.05.004
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发表时间：
2018
影响因子：
9.1
通讯作者：
Yang Cheng
中科院分区：
文献类型：
--
作者：
Yi Jigao;Liang Wenting;Wei Xueqin;Yao Jiabin;Yan Zhiqiang;Su Dan;Zhong Zhihui;Gao Guowei;Wu Wanhua;Yang Cheng
以一系列6A， 6x -二胍-γ-环糊精（CDs）为手性宿主，介导2-蒽甲酸（AC）对映分化[4 + 4]光环二聚反应。这些γ- cd衍生物在氨水溶液中与AC形成稳定的1:2三元配合物，并且在这些双胍-γ- cd的存在下，头对头的光二聚体3和4大大增强。手性光二聚体2和3的对映选择性是温度和氨含量的关键函数，通过改变这些外部因素表现出倒转的产物手性。
A series of 6A,6X-diguanidio-γ-cyclodextrins (CDs) were used as chiral hosts for mediating the enantiodifferentiating [4 + 4] photocyclodimerization of 2-anthracenecarboxylic acid (AC). Theseγ-CD derivatives form stable 1:2 ternary complexes with AC in aqueous ammonia solutions and the head-to-head photodimers3and4were greatly enhanced in the presence of these diguanidio-γ-CDs. The enantioselectivity of chiral photodimers2and3is a critical function of the temperature and the ammonia contents, showing inverted product chirality by changing these external factors.