Full circle: New cyclic tris(spiroborate)s were prepared as molecular recognition modules for nanometer‐sized cationic guests. These cyclophanes were simply prepared by treating corresponding bis(2,3‐dihydroxynaphthalene)s with an equimolar amount of boric acid. The molecular recognition ability of these cyclic spiroborates was estimated in solution and crystal phases by the use of [Ir(tpy2)]3+ as
Multicomponent construction of the tetrakis(spiroborate) anionic nanocycles was achieved by reacting bis(dihydroxynaphthalene)s with tetrahydroxyanthraquinone in the presence of boric acid in a self-organized manner. These nanocycles exhibited selective molecular recognition behavior toward cationic guests such as methyl viologen derivatives. Formation of a supramolecular [email protected] and a [
Confronting the Challenge of Asymmetric Carbonyl Addition to Sterically Bulky Isatins: Upgrading Dirhodium(II)/Biphosphine Catalytic System
作者:Wenjing Guo、Shuming Zhan、Han Yang、Zhenhua Gu
DOI:10.1021/acs.orglett.3c01028
日期:2023.5.12
Catalyticasymmetricaddition of arylboronic acids to ketones is a powerful transformation for directly delivering chiral tertiary alcohols. However, there is no successful example of enantioselective addition to steric bulky isatins, which contain bulky substituent at the 4-position. To confront this challenge, in this work a dirhodium/(BTFM-Garphos) system was developed that showed extremely high
Economical and Readily Accessible Preparation of <i>o</i>,<i>o</i>-Disubstituted Arylboronates through Palladium-Catalyzed Borylation of Haloarenes
作者:Ryoichi Kuwano、Eunhyung Lee、Sungyong Won
DOI:10.1021/acs.orglett.1c03926
日期:2021.12.17
Selective detection of Cys and GSH by using one fluorescent probe at two excitation wavelengths
作者:Yintang Xiao、Kai Guo、Jun Wei、Xiaowei Gao、Dong Yi、Yang Li、Xiaoqi Yu、Chun Zhang、Qin Wang
DOI:10.1016/j.tetlet.2020.152462
日期:2020.10
Selective detection of Cys and GSH by using one fluorescent probe with two different excitation wavelengths is developed based on a naphthyl-coumarin aldehyde probe. Mechanistic studies indicate that the distinctively different fluorescent responses of the probe toward Cys and GSH at the two excitation wavelengths are due to two different reaction pathways that generate different products. The probe has been used to detect Cys and GSH in HeLa cells by using two emission channels. (C) 2020 Elsevier Ltd. All rights reserved.