Chiral Macrocycle‐Enabled Counteranion Trapping for Boosting Highly Efficient and Enantioselective Catalysis
作者:Rui Ning、Hao Zhou、Shi‐Xin Nie、Yu‐Fei Ao、De‐Xian Wang、Qi‐Qiang Wang
DOI:10.1002/anie.202003673
日期:2020.6.26
manipulated for tuning the catalysis process. In parallel to well‐developed crown ether‐based cation‐binding catalysis, a macrocycle‐enabled counteranion trapping strategy is presented for boosting highly efficient and enantioselective catalysis. A set of bis‐diarylthiourea macrocycles containing two BINOL moieties were designed and synthesized. They possess a well‐confined chiral cavity and strong binding
可以定制量身定制的大环化合物实现紧密结合,以调节催化过程。与发达的基于冠醚的阳离子结合催化同时,提出了大环活化的对负离子捕获策略,以促进高效和对映选择性催化。设计并合成了一组包含两个BINOL部分的双-二芳基硫脲大环。它们具有密闭的手性腔,对二磺酸根阴离子具有很强的结合亲和力。由于紧密结合,仅1 mol%的大环化合物与1 mol%的乙二磺酸结合可以促进吲哚与亚胺的Friedel-Crafts反应中优异的转化率和高达99%ee。单独的酸或大环化合物不提供任何反应性。