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
General Suzuki Coupling of Heteroaryl Bromides by Using Tri-<i>tert</i>-butylphosphine as a Supporting Ligand
作者:Yinjun Zou、Guizhou Yue、Jianwei Xu、Jianrong Steve Zhou
DOI:10.1002/ejoc.201402915
日期:2014.9
A general procedure for the fast Suzuki coupling of major families of heteroaryl bromides was realized by using Pd(OAc)2/PtBu3 as the catalyst. Many couplings were finished within minutes at room temperature in n-butanol. Different from previous studies, three typical heteroaryl bromides were systematically examined in couplings of various heteroaryl and aryl boronic acids.
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.
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