A new colorimetric chemodosimeter for mercury ion via specific thioacetal deprotection in aqueous solution and living cells
摘要:
A sensitive and selective new chemodosimeteric chemosensor (DIBT) for mercury ions was successfully devised and characterized. Upon addition of Hg2+ to DIBT, a red-edge absorption band at 972 nm was observed. An important feature for the new chemodosimeter is its high selectivity toward mercury ions over the other competitive species due to Hg2+-triggered specific C-S cleavage, making the 'naked-eye' detection of mercury ions possible in aqueous solution and living cells such as Candida albicans. (c) 2012 Elsevier Ltd. All rights reserved.
Photocatalytic Generation of 2-Azolyl Radicals: Intermediates for the Azolylation of Arenes and Heteroarenes via C–H Functionalization
作者:Amandeep Arora、Jimmie D. Weaver
DOI:10.1021/acs.orglett.6b01718
日期:2016.8.19
2-bromoazoles via photocatalysis, is a powerful intermediate for the intermolecular arylation of unmodified (hetero)arenes. The reaction is characterized by mild conditions, operational simplicity, tolerance toward functional and sterically demanding groups, broad scope, and anti-Minisci selectivity. A working mechanism is provided, and a low-solubility amine is essential for successful coupling. The utility
o-Benzenedisulfonimide has been used to efficientlycatalyse the reaction between 2-aminothiophenol, 2-aminophenol, o-phenylenediamine and various ortho esters (28 examples; average yield 90%) or aldehydes (17 examples; average yield 72%) giving the corresponding benzofused azoles in excellent yields. Reaction conditions were very simple. In addition, other carboxylic acid derivatives have been tested
Syntheses of 2-arylbenzothiazoles from flash vacuum pyrolyses and photolyses of 2-methylthio-N-(arenylidene)anilines
作者:Chin-Hsing Chou、Pin-Chih Yu、Bo-Chi Wang
DOI:10.1016/j.tetlet.2008.04.118
日期:2008.6
Flash vacuum pyrolyses and photolyses of 2-methylthio-N-(arenylidene)anilines 2a–h are new and convenient methods for the syntheses of 2-arylbenzothiazoles 1a–h.
One-pot synthesis of benzofused heteroaryl azoles <i>via</i> tandem C-heteroatom coupling/C–H activation of azoles
作者:Xurong Qin、Xuefeng Cong、Dongbing Zhao、Jingsong You、Jingbo Lan
DOI:10.1039/c1cc10572h
日期:——
The Cu(I) or Pd(II)-catalyzed cross-couplings of gem-dihaloolefins with azoles viatandem C-heteroatom coupling/C-Hactivation for the preparation of benzofused heteroaryl azoles have been developed.
We have demonstrated a novel and green approach for the synthesis of 2-substituted benzothiazole analogues. A number of 2-aryl and heteroaryl benzothiazole scaffolds were synthesized using Amberlite IR-120 resin under microwave irradiation. The catalytic role and reusability of the resin was well established here. 2-Substituted benzothiazole analogues (3a-l) were also tested against several bacterial