Fluorescent dyad for cooperative recognition of copper cation and halogen anion
摘要:
TMS-ethynyl triazolyl benzothiadiazole (BTD) derivatives have been successfully synthesized by mono deprotection of di-TMS-ethynyl BTD followed by click chemistry. The fluorescence intensity of TMS-ethynyl triazolyl BTD-DCM dyad 8, as well as triazolyl BTD 3, and the DCM derivative 7 could be selectively quenched by Cu2+, but almost not affected by different tested anions. Interestingly, the fluorescence emission of DCM-based fluorophores 7 and 8 was highly sensitive to a combination of Cu2+, F-, or Br- in a sequence dependent manner. With the dyad 8, the detection limit as low as 0.13 ppb could be attained for F- in MeCN. The Cu2+-promoted aerobic oxidative dimerization of DCM moiety to tetrahydrofuran derivatives has also been demonstrated for the first time. (C) 2013 Elsevier Ltd. All rights reserved.
Efficient synthesis of fluorescent alkynyl C-nucleosides via Sonogashira coupling for the preparation of DNA-based polyfluorophores
作者:Dominik K. Kölmel、Luzi J. Barandun、Eric T. Kool
DOI:10.1039/c6ob01199c
日期:——
A facile and general procedure for the preparation of alkynyl C-nucleosides with varied fluorophores is presented. Sonogashira coupling was used as a key reaction to conjugate the dyes to an easily accessible ethynyl functionalized deoxyribose derivative. The new C-nucleosides were used for the preparation of DNA-based polyfluorophores.
Synthetic Method of 5,5-Dimethyl-2,4-Adipaldehyde-0,0-Boron Difluoride
申请人:Cai Lifei
公开号:US20120071695A1
公开(公告)日:2012-03-22
This invention, which involves synthetic method of 5, 5- dimethyl-2, 4-adipaldehyde-0, 0-Boron difluoride, belongs to the field of organic synthesis. Synthetic method of 5, 5-dimethyl-2, 4-adipaldehyde-0, 0-Boron difluoride is to react pinacolone and boron trifluoride diethyl ether at low temperature, and then add aqueous alkaline solution in after treatment to extract product from ether, after that, separate fluid, condense organic phase and final product is obtained. Yield of this method is 2 to 3 times higher than that in literature, and apart from that, mild reaction condition, simple procedures, easy operation, and low cost make it easy for industrial production. The product can be used directly in next step reaction without any special purification.
While the original probe (TD-1) was not efficient enough, supramolecular self-assembly with a glycocluster (TPE2S or TPE4S) could restore and enhance its fluorescence detection properties.
Supramolecular Assembly of TPE‐Based Glycoclusters with Dicyanomethylene‐4
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‐pyran (DM) Fluorescent Probes Improve Their Properties for Peroxynitrite Sensing and Cell Imaging
glycoclusters were used to self‐assemble with these DM probes to obtain supramolecular water‐soluble glyco‐dots. This self‐assembly strategy enhanced the fluorescence intensity, leading to an enhanced selectivity and activity of the resulting glyco‐dot comparing to DM probes alone in PBS buffer. The glyco‐dots also exhibited better results during fluorescence sensing of intracellular ONOO− than the probes