Modular quadruplex–duplex hybrids as biomolecular scaffolds for asymmetric Michael addition reactions
作者:Ji Hye Yum、Hiroshi Sugiyama、Soyoung Park
DOI:10.1039/d0ob01362e
日期:——
conformation, thermal stability, and metal-binding ability of modified QD hybrid DNA were characterized using spectroscopy. The QD hybrid-based DNA catalysts were successfully applied to asymmetric Michael additionreactions (86% conversion and 76% ee). This study describes a new type of DNA hybrid catalyst produced by the construction of a cooperative active site with a Lewis acid and a H-bond donor.
由于 DNA 具有多种三级结构、化学稳定性和易于处理等优点,基于 DNA 支架的不对称合成已被积极利用。由于基于双链 DNA 的杂化催化剂已经证明了这种卓越的能力,因此人们努力研究新的生物分子支架。在此,我们报告了含有联吡啶配体和氢供体部分的模块化四链体-双链体 (QD) 杂化 DNA 催化剂。使用光谱学表征了修饰的 QD 杂合 DNA 的构象、热稳定性和金属结合能力。基于 QD 杂化的 DNA 催化剂成功地应用于不对称迈克尔加成反应(86% 转化率和 76% ee)。
Highly Efficient Cyclic Dinucleotide Based Artificial Metalloribozymes for Enantioselective Friedel–Crafts Reactions in Water
作者:Changhao Wang、Min Hao、Qianqian Qi、Jingshuang Dang、Xingchen Dong、Shuting Lv、Ling Xiong、Huanhuan Gao、Guoqing Jia、Yashao Chen、Jörg S. Hartig、Can Li
DOI:10.1002/anie.201912962
日期:2020.2.24
construct artificial metalloenzymes (ArMs) for enantioselective catalysis. DNA-based ArMs containing duplex and G-quadruplex scaffolds have been widely investigated, yet RNA-based ArMs are scarce. Here we report that a cyclic dinucleotide of c-di-AMP and Cu2+ ions assemble into an artificialmetalloribozyme (c-di-AMP⋅Cu2+ ) that enables catalysis of enantioselective Friedel-Crafts reactions in aqueous
Enantioselective Friedel–Crafts reactions in water catalyzed by a human telomeric G-quadruplex DNA metalloenzyme
作者:Changhao Wang、Yinghao Li、Guoqing Jia、Yan Liu、Shengmei Lu、Can Li
DOI:10.1039/c2cc31320k
日期:——
A human telomeric G-quadruplex (G4DNA) metalloenzyme, assembled with G4DNA and Cu2+ ions, can catalyze the enantioselective FriedelâCrafts (FâC) reaction in water with good enantioselectivity (up to 75% ee). Furthermore, we found that the absolute configuration and the enantioselectivity of the product largely depend on the conformation and the sequence of G4DNA.
Organic co-solvents in aqueous DNA-based asymmetric catalysis
作者:Rik P. Megens、Gerard Roelfes
DOI:10.1039/b921385f
日期:——
Water-miscible organic co-solvents can be used in DNA-based catalytic asymmetric reactions at appreciable concentration without a negative effect on enantioselectivity. While the rate of the copper(II) Diels–Alder reaction is affected negatively by the presence of organic co-solvents, the copper(II) catalyzed Michael addition and Friedel–Crafts alkylation reaction are significantly faster. Additionally