Near-infrared BODIPY dyes modulated with spirofluorene moieties
摘要:
New structurally constrained BODIPY dyes having electron-donating substituents were synthesized. As the key compounds for the construction of the BODIPY dyes, 1'H-spiro-[fluorene-9,4'-indeno[1,2-b] pyrrole] (sp-FIP) derivatives with electron-donating groups, such as OMe and NMe2 at its 6'-position, were prepared using palladium-catalyzed intramolecular direct C-H arylation of a pyrrole moiety. The resulting BODIPY dyes showed bathochromic shift in absorption and fluorescence spectra in comparison to the unsubstituted analogs. Furthermore, pH-dependent reversible spectrum changes of the BODIPY dye were observed with the addition of trifluoroacetic acid (TFA) and subsequent addition of i-Pr2NEt. (C) 2011 Elsevier Ltd. All rights reserved.
organic catalysts to complement the frequently used and precious polypyridyl transition metal systems. Herein, a scalable synthesis of suitable acridinium dyes and their application in photoredox deuterations are described. The acridinium catalysts, prepared on multi-gram scale, allowed the deuteration of a pharmaceutically relevant scaffold in high yield and selectivityundermildconditions. The continuous
Enantioselective Synthesis of Inherently Chiral Calix[4]arenes via Palladium-Catalyzed Asymmetric Intramolecular C–H Arylations
作者:Yu-Zhen Zhang、Meng-Meng Xu、Xu-Ge Si、Jun-Li Hou、Quan Cai
DOI:10.1021/jacs.2c10606
日期:2022.12.21
report herein an efficient approach for the enantioselective synthesis of inherentlychiralcalix[4]arenes via palladium-catalyzed asymmetric intramolecular C–H arylations. Using a chiral bifunctional phosphine-carboxylate ligand, the inherent chirality on macrocyclic scaffolds was induced successfully, from which a wide range of calix[4]arenes with fluorenone motifs were obtained with good yields and excellent
A multi-responsive system based on intramolecular B ← OP Lewis acid–base pairs
作者:Yu Wang、Kanglei Liu、Pangkuan Chen、Xiaodong Yin、Tai Peng、Javed Iqbal、Nan Wang
DOI:10.1039/d2tc01999j
日期:——
switching between the open and closed structures based on the intramolecular B ← O bond plays a key role in their solution state fluorescence response to external stimuli, which can be further tuned by adjusting the electronic/steric properties of the substituents on the BR2/P(O)R2 unit. All these compounds exhibit remarkable mechanochromism. Furthermore, upon grinding, pressure-induced blue-shifted and