89-62-3Relevant articles and documents
Aromatic ring liquid crystal compound and liquid crystal composition and application thereof
-
Paragraph 0116-0118; 0123-0124; 0147-0149; 0152-0153, (2021/05/29)
The invention relates to an aromatic ring liquid crystal compound, a liquid crystal composition and an assembly suitable for a microwave region and a millimeter wave region of a high-frequency technology or an electromagnetic spectrum, and particularly a phase shifter and a microwave array antenna. The liquid crystal composition provided by the invention at least comprises a compound represented by a general formula I. The liquid crystal composition provided by the invention is good in stability, high in response speed and wide in liquid crystal phase temperature range.
A two price arrowheads catalytic 4 - methyl - 2 - nitroaniline synthetic method (by machine translation)
-
Paragraph 0020-0023; 0024-0027; 0028-0031; 0032-0035, (2018/04/27)
The invention discloses a method for synthesizing 4 - methyl - 2 - nitroaniline method, comprises the following steps: (1) in order to N - (toluene) urethane raw material, addition of an oxidizing agent, to palladium acetate, palladium chloride and palladium sulfate in an arbitrary as catalyst, as the nitrating agent is tert-butyl nitrite, in the 80 - 100 °C lower, in solvent 1, 4 - dioxane are reacted in a, make corresponding O-nitro containing protecting group to the toluidine; (2) then hydrolysis, to obtain the target product. 2. Method according to Claim 1, characterized in that part (1) in the step, the oxidant is air, O2 And hydrogen peroxide in an arbitrary. The method of the invention preparation technology is simple, mild reaction conditions, high yield, environment-friendly. (by machine translation)
4-methyl-2-nitroaniline synthesis method
-
Paragraph 0018-0028, (2018/03/24)
The invention discloses a 4-methyl-2-nitroaniline synthesis method, which comprises: carrying out amino protection with ethyl chloroformate by using 4-methylaniline as a raw material to generate N-(p-toluene)ethyl carbamate; adding an oxidant and a copper salt catalyst, and carrying out a reaction for a certain time at a temperature of 50-120 DEG C in a reaction solvent by using a nitroso-containing compound as a nitrating agent to prepare a corresponding protected o-nitro-p-toluidine; and carrying out hydrolysis to obtain the target product. According to the present invention, the method hasadvantages of simple preparation process, mild reaction condition, high yield and environment protection.
Selectivity of the complexation reactions of four regioisomeric methylcamphorquinoxaline ligands with gold(III): X-ray, NMR and DFT investigations
Gli?i?, Biljana D.,Hoffmann, Marcin,Warzajtis, Beata,Gen?i?, Marija S.,Blagojevi?, Polina D.,Radulovi?, Niko S.,Rychlewska, Urszula,Djuran, Milo? I.
, p. 137 - 149 (2016/01/15)
Reported are the synthesis, spectral and structural characteristics of new quinoxaline-related regioisomeric ligands L1-L4 (1,x,11,11-tetramethyl-1,2,3,4-tetrahydro-1,4-methanophenazine, x = 7, 8, 9 and 6, respectively) and their mononuclear Au(III) complexes (1-4). Fusion of the camphor moiety to the quinoxaline core made two N-atoms of quinoxaline nonequivalent while the introduction of a methyl-substituent at positions 6-9 enabled a tuning of coordination properties of L1-L4. Gold(III) complexes 1-4 and ligands L1-L4 have been studied in detailed by 1D and 2D NMR and the structures of 1-4 have been determined by X-ray crystallography. The results of these analyses revealed a regiospecific coordination of Au(III) to the sterically less hindered N-5 atom (spatially close to the non-substituted bridgehead carbon) of L1-L3, and to N-10 (spatially close to the methyl-substituted bridgehead carbon) of L4. The results of DFT calculations shed light on disparate coordination modes of L1-L4 toward the AuCl3 fragment and explain formation of single coordination products in high yield.
Perenosins: A new class of anion transporter with anti-cancer activity
Van Rossom, Wim,Asby, Daniel J.,Tavassoli, Ali,Gale, Philip A.
supporting information, p. 2645 - 2650 (2016/03/05)
A new class of anion transporter named 'perenosins' consisting of a pyrrole linked through an imine to either an indole, benzimidazole or indazole is reported. The indole containing members of the perenosin family function as effective transmembrane Cl-/NO3- antiporters and HCl cotransporters in a manner similar to the prodigiosenes. The compounds reduce the viability of MDA-MB-231 and MCF-7.
Discovery of phenoxybutanoic acid derivatives as potent endothelin antagonists with antihypertensive activity
Cai, Jin,Liu, Ligang,Hong, Kwon Ho,Wang, Peng,Li, Lushen,Cao, Meng,Sun, Chunlong,Wu, Xiaoqing,Zong, Xi,Chen, Junqing,Ji, Min
, p. 657 - 667 (2015/02/19)
A series of phenoxybutanoic acid derivatives were synthesized and tested for their antagonistic activity on the contraction of the rat thoracic aortic ring induced by endothelin-1. Preliminary screening results showed that 6e and 6g with benzoheterocycles demonstrated significant antagonistic activities when compared to the reference compound BQ123. The results from additional assays for the binding affinity and selectivity for endothelin receptors showed that 6e was a selective ETA antagonist with a nanomolar IC50. Moreover, 6e was effective in relieving hypoxia-induced pulmonary arterial hypertension and right ventricular weight ratio. Therefore, 6e may have potential for further development as a therapeutic agent for the treatment of cardiovascular diseases.
Copper-catalyzed mild nitration of protected anilines
Hernando, Elier,Castillo, Rafael R.,Rodríguez, Nuria,G?mez Arrayás, Ram?n,Carretero, Juan C.
, p. 13854 - 13859 (2016/02/18)
A practical copper-catalyzed direct nitration of protected anilines, by using one equivalent of nitric acid as the nitrating agent, has been developed. This procedure features mild reaction conditions, wide structural scope (with regard to both N-protecting group and arene substitution), and high functional-group tolerance. Dinitration with two equivalents of nitric acid is also feasible. Practical and reliable: A Cu-catalyzed selective nitration of para- and ortho-substituted aniline derivatives by using one equivalent of HNO3 has been developed that produces water as the only stoichiometric byproduct (see scheme; PG=protecting group). This method is compatible with strongly electron-deficient substrates, enabling dinitration (by using 2.0 equiv of HNO3). This method allows for a rapid access to relevant nitrogen-containing heterocyclic architectures.
Direct oxidative nitration of aromatic sulfonamides under mild conditions
Li, Ying-Xiu,Li, Lian-Hua,Yang, Yan-Fang,Hua, Hui-Liang,Yan, Xiao-Biao,Zhao, Lian-Biao,Zhang, Jin-Bang,Ji, Fa-Jin,Liang, Yong-Min
supporting information, p. 9936 - 9938 (2014/08/18)
A direct nitration of aromatic sulfonamides using sodium nitrite as the nitrating agent has been developed. The reaction shows typically mono-substitution selectivity and can be enlarged to the gram scale with good yield.
Design of ionic liquid 3-methyl-1-sulfonic acid imidazolium nitrate as reagent for the nitration of aromatic compounds by in situ generation of NO 2 in acidic media
Zolfigol, Mohammad A.,Khazaei, Ardeshir,Moosavi-Zare, Ahmad R.,Zare, Abdolkarim,Kruger, Hendrik G.,Asgari, Zhila,Khakyzadeh, Vahid,Kazem-Rostami, Masoud
experimental part, p. 3640 - 3645 (2012/06/15)
3-Methyl-1-sulfonic acid imidazolium nitrate ([Msim]NO3) as a new Bronsted acidic ionic liquid and nitrating agent was prepared and used for the efficient nitration of aromatic compounds (even aniline derivatives). The dramatic effect of this reagent by in situ generation of nitrogen dioxide as a radical on aromatic compounds to give nitroarenes has been studied.
Arylethenylbenzofuroxan derivatives as drugs for chagas disease: Multigram batch synthesis ysubg a wuttug#bideb process
Porcal, Williams,Merlino, Alicia,Boiani, Mariana,Gerpe, Alejandra,Gonzalez, Mercedes,Cerecetto, Hugo
supporting information, p. 156 - 162 (2013/01/03)
In the present work, we developed robust processes for the preparation of new antitrypanosomal benzofuroxans, E and Z isomers of 5-arylethenylbenzo[1,2-c] 1,2,5-oxadiazole p1N-oxide 1-6, in muhigram batch through Wittig-Boden conditions as the key synthetic step. In these conditions, the generation of the benzofurazans, as secondary byproduct, was minimized.
