An Efficient Cyclic Di-AMP Based Artificial Metalloribozyme for Enantioselective Diels-Alder Reactions
作者:Qianqian Qi、Shuting Lv、Min Hao、Xingchen Dong、Youkun Gu、Peizhe Wu、Wenyue Zhang、Yashao Chen、Changhao Wang
DOI:10.1002/ejoc.202000652
日期:2020.8.2
A small cyclic RNA of c‐di‐AMP and Cu2+ ions could assemble into an artificialmetalloribozyme, that is able to catalyze the enantioselectiveDiels–Alderreactions with up to 80 % ee . The presence of c‐di‐AMP in the metalloribozyme not only achieves the chirality transfer but also gives rise to a significant rate enhancement.
Asymmetric Diels-Alder reactions between aza-chalcone and cyclopentadiene (CP) catalyzed by the binaphthol-titanium (BINOL – Ti) in the presence of HMPA (80 mole %) were studied. The products were obtained with up to 87% ees.
Enantioselective Diels-Alder Reactions with G-Quadruplex DNA-Based Catalysts
作者:Changhao Wang、Guoqing Jia、Jun Zhou、Yinghao Li、Yan Liu、Shengmei Lu、Can Li
DOI:10.1002/anie.201204850
日期:2012.9.10
DNA in command: An enantioselectiveDiels–Alderreaction can be achieved using human telomeric G‐quadruplex DNA‐based catalysts. The absolute configuration of the product can be reversed when the conformation of G‐quadruplex DNA is switched from antiparallel to parallel, and both the reaction rate and the enantioselectivity of the Diels–Alderreaction were found to be dependent on the DNA sequence
found that the G-triplex DNA could be used as an enantioselectivecatalyst without further addition of ligands in Diels–Alderreactions when coordinated with copper ions, for the first time. The efficiency and selectivity of the catalyst were investigated. The kinetic measurements were made using ultraviolet (UV) light. The stability of the catalyst in aqueous buffer was confirmed by circular dichroism
that were covalently bound to copper(II) catalysts. The resulting cells enantioselectively catalyzed the abiotic Diels-Alder cycloaddition reaction of cyclopentadiene and azachalcone. The prospects of this strategy lie in the organ-confined in vivo preparation of receptor-based artificial metalloenzymes for the catalysis of reactions exogenous to the human metabolism. These could be used for the targeted
众所周知,人工金属酶是有前途的生物催化工具,但它们最近的区室化导致与细胞成分相容,从而为可能的治疗应用提供了线索。我们制备并表征了基于嵌入人类活细胞细胞质膜中的 A2A 腺苷受体的人工金属酶。野生型受体通过与共价结合到铜 (II) 催化剂的强拮抗剂结合而被化学改造为金属酶。所得细胞对映选择性催化环戊二烯和氮杂查耳酮的非生物狄尔斯-阿尔德环加成反应。该策略的前景在于基于受体的人工金属酶的器官限制在体内制备,用于催化人类代谢的外源反应。