- Aerobic Dehydrogenation of N-Heterocycles with Grubbs Catalyst: Its Application to Assisted-Tandem Catalysis to Construct N-Containing Fused Heteroarenes
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An aerobic dehydrogenation of nitrogen-containing heterocycles catalyzed by Grubbs catalyst is developed. The reaction is applicable to various nitrogen-containing heterocycles. The exceptionally high functional group compatibility of this method was confirmed by the oxidation of an unprotected dihydroindolactam V to indolactam V. Furthermore, by taking advantage of the oxygen-mediated structural change of the Grubbs catalyst, we integrated ring-closing metathesis and subsequent aerobic dehydrogenation to develop the novel assisted-tandem catalysis using molecular oxygen as a chemical trigger. The utility of the assisted-tandem catalysis was demonstrated by the concise synthesis of N-containing fused heteroarenes including a natural antibiotic, pyocyanine.
- Kawauchi, Daichi,Noda, Kenta,Komatsu, Yoshiyuki,Yoshida, Kei,Ueda, Hirofumi,Tokuyama, Hidetoshi
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supporting information
p. 15793 - 15798
(2020/10/12)
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- Pyrazine compound and application thereof
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The invention discloses a pyrazine compound and application thereof. In particular, the present invention provides a compound represented by the formula (I), wherein the extractant composed of the compound has a high extraction rate for lithium ions, and the organic phase is easy to enrich lithium-7 isotopes, so as to realize the extraction and separation of lithium isotopes.
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Paragraph 0155; 0157-0158
(2019/07/04)
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- Site-selective synthesis of functionalized dibenzo[: F, h] quinolines and their derivatives involving cyclic diaryliodonium salts via a decarboxylative annulation strategy
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Here we report a site-selective synthesis of functionalized dibenzo[f,h]quinolines and their derivatives, which could be used as OLED materials. The key step is the double cross coupling reaction between the 2-chloropyridinyl acids and the cyclic diaryliodonium salts, where the carboxylic acid was unprecedentedly employed as both a traceless directing group and a functional handle in a one-pot atom- and step-economical process.
- Yang, Shuai,Hua, Wenkai,Wu, Yanqi,Hu, Tao,Wang, Feng,Zhang, Xingxian,Zhang, Fengzhi
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supporting information
p. 3239 - 3242
(2018/04/05)
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- With dibenzo [f, h] quinaline * [...] electroluminescent metal complexes
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This invention relates to electroluminescent metal complexes of the formula (I), or (II), a process for their preparation, electronic devices comprising the metal complexes and their use in electronic devices, especially organic light emitting diodes (OLE
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Paragraph 0381; 0382
(2016/10/10)
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- Reactions of 1,2,5-thiadiazole 1,1-dioxide derivatives with nitrogen nucleophiles. Part IV. Addition of α-diamines
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α-diamines, such as ethylendiamine and o-phenylendiamine, add to 3,4-aryl-disubstituted 1,2,5-thiadiazole 1,1-dioxides to give dihydropyrazines or quinoxalines, respectively and sulfamide. The new compound acenaphtho [5,6-b]-2,3-dihydropyrazine was synthesized and characterized. The addition of ethylendiamine to 3,4-diphenyl-1,2,5-thiadiazoline 1,1-dioxide gives 3,4-disubstituted thiadiazolidlne 1,1-dioxide, dihydropyrazines, or pyrazines, depending on the reaction condition used. The reactions were followed by cyclic voltammetry and NMR spectroscopy which, in some cases, allowed the detection of the thiadiazolidine intermediate. Copyright
- Mirifico, Maria Virginia,Caram, Jose Alberto,Vasini, Enrique Julio,Piro, Osear Enrique,Castellano, Eduardo E.
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experimental part
p. 163 - 169
(2010/04/30)
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- Spectroscopic and electrochemical properties of dichlorodiimine complexes of Au(III) and Pt(II) with 1,4-diazine derivatives of o-phenanthroline
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A series of dichlorodiimine complexes [M(N∧N)Cl2] z of Au(III) and Pt(II) with 1,4-derivatives of o-phenanthroline [(N∧N) = o-phenanthroline (phen), dipyrido[f,h]quinoxaline (dpq), dipyrido[a,c]phenazine (dppz), 6,7-dicyanodipyrido[f,h]quinoxaline (dicnq)] were prepared and characterized by 1H NMR, electronic absorption, and emission spectroscopy and by cyclic voltammetry. In all the complexes, the 3(π-π*)-type transition is the spin-forbidden transition of the lowest energy, responsible for the luminescence. The longest wave bands in the absorption spectra of the Au(III) and Pd(II) complexes were assigned in accordance with the results of the electrochemical studies to the 1(d*)-and 1(d*)-type transitions, respectively. Pleiades Publishing, Inc., 2006.
- Ivanov,Puzyk,Balashev
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p. 843 - 848
(2008/02/02)
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- Synthesis and characterization of 9,10-bis(arylimino)-9,10-dihydrophenanthrenes, the structure of (Z,Z)-9,10-bis(phenylimino)-9,10-dihydrophenanthrene and PdCl2-[(E,E)-9,10-bis(phenylimino)-9,10-dihydrophenanthrene] in the solid state and in so
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The synthesis and characterization of substituted phenanthrene-9,10-quinone diimines of the type 9,10-bis(arylimino)-9,10-dihydrophenanthrene (aryl-BIP) is described. These rigid bisnitrogen ligands have been synthesized by a metal-mediated cyclodehydroge
- Van Belzen, Ruud,Klein, Rene A.,Smeets, Wilberth J.J.,Spek, Anthony L.,Benedix, Roland,Elsevier, Cornelis J.
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p. 275 - 285
(2007/10/03)
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