Alkoxy-substituted Derivatives of π-Conjugated Acyclic Anion Receptors: Effects of Substituted Positions
作者:Hiromitsu Maeda、Nazuki Eifuku
DOI:10.1246/cl.2009.208
日期:2009.3.5
The synthesis, solid-state assemblies, and anion binding affinities of π-conjugated acyclic anion receptors with alkoxyphenyl substituents are discussed. The position of the alkoxy moiety is essential to determining not only the electronic state but also the anion binding affinity.
A facile three‐step synthesis of 2‐(2‐aminophenyl)pyrrole (1) and 2‐[(2‐aminomethyl)phenyl]pyrrole (2) is reported by use of Suzuki coupling of N‐Boc‐pyrrol‐2‐yl boronic acid (3) and o‐substituted aryl halogenides, followed by hydrogenation. The Pd‐catalyzed cross‐coupling reaction is optimized to be applicable to a wide range of substitued aryl halogenides, with electron‐donating and electron‐withdrawing
据报道,通过N -Boc-吡咯-2-基的Suzuki偶联,可以轻松实现三步合成2-(2-氨基苯基)吡咯(1)和2-[((2-氨基甲基)苯基]吡咯(2)。硼酸(3)和邻位取代的芳基卤化物,然后氢化。对Pd催化的交叉偶联反应进行了优化,以适用于具有电子给体和吸电子取代基5a,5b,5c,5d,5e,5f,5g的广泛取代的芳基卤化物。此外,邻溴代苯胺和3的Pd催化偶联可用于吡咯并[1,2 - c ]喹唑啉-5(6 H)-一(8)的一步制备。J.杂环化学。(2011)。
3,5-Diaryl-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) Dyes: Synthesis, Spectroscopic, Electrochemical, and Structural Properties
作者:Armin Burghart、Heejin Kim、Mike B. Welch、Lars H. Thoresen、Joe Reibenspies、Kevin Burgess、Fredrik Bergström、Lennart B.-Å. Johansson
DOI:10.1021/jo990796o
日期:1999.10.1
This research was undertaken to obtain new "BODIPY" dyes that fluoresce at relatively long wavelengths. The title compounds 1a-e were prepared via a divergent route involving Suzuki couplings of arylboronic acids to N-tert-butoxycarbonyl-4-bromopyrrole 2, condensation of the products with an acid chloride, and incorporation of the boron difluoride entity. Two alkyl-substituted systems 7a and 7b were also prepared for comparison; the critical difference between structures 1 and 7 is that the former have an aryl group attached to each pyrrole nucleus whereas the latter only have alkyl substituents on that same ring. UV absorption and fluorescence emission data were compared for compounds 1 and 7. Absorption and fluorescence emission maxima for compounds 1 occur at higher wavelengths than for compounds 7, and the Stokes shifts for the aryl-substituted compounds 1 are larger than for the alkyl-substituted compounds 7. Fluorescence quantum yields measured for compounds 1 are less than for compounds 7, and possible reasons for this are outlined. Other physical data for the compounds were also collected. Oxidation and reduction potentials of the systems were obtained from cyclic voltammetry experiments, and a single-crystal X-ray structure determination was performed for the bisnaphthyl-substituted compound 1b.
[EN] ORGANIC THIN FILM SOLAR CELL MATERIAL<br/>[FR] MATÉRIAU POUR CELLULE SOLAIRE À COUCHE MINCE ORGANIQUE
C-H Arylation of <i>N</i>
-Heteroarenes under Metal-Free Conditions and its Application towards the Synthesis of Pentabromo- and Pentachloropseudilins
作者:Mukesh Kumar、Shweta Sharma、Parijat Sil、Manoj Kushwaha、Satyajit Mayor、Ram A. Vishwakarma、Parvinder Pal Singh
DOI:10.1002/ejoc.201900353
日期:2019.6.16
Herein, we have developed a metal‐free and mild condition for the synthesis of 2‐arylated heteroarenes. The complex forming property and charge transfer property of phenothiazine expanded its application towards catalysis The optimized condition has been successfully employed for the synthesis important marine natural product namely pentabromo/chloropseudilins (PBP/PCP). The synthesized Pentachloropseudilin