46496-80-4Relevant academic research and scientific papers
Anti-plasmodial and anti-trypanosomal activity of synthetic naphtho[2,3-b]thiophen-4,9-quinones
Zani, Carlos L.,Chiari, Egler,Krettli, Antoniana U.,Murta, Silvane M.F.,Cunningham, Mark L.,Fairlamb, Alan H.,Romanha, Alvaro J.
, p. 2185 - 2192 (1997)
Naphtho[2,3-b]thiophen-4,9-quinone and five derivatives were prepared using the Friedel-Crafts reaction and tandem-lithiation of aromatic diethylamides. These quinones were evaluated for their trypanocidal and anti-plasmodial activities by their effects on: (1) growth of epimastigote forms of Trypanosoma cruzi in vitro, (2) lysis of trypomastigote forms of T. cruzi in murine blood, (3) growth of Plasmodium falciparum in vitro, and (4) inhibition of the recombinant enzyme trypanothione reductase. The parent compound, naphtho[2,3-b]thiophen-4,9-quinone (3a), was among the most active quinone tested in vitro against P. falciparum at 0.2 μM. However, it was inactive against P. berghei-infected mice treated with 2.3 mmol/kg daily for 5 days. Most of the quinones prepared were active against T. cruzi epimastigotes in culture but exhibited weak activity at 4°C against trypomastigotes in murine blood as well against the enzyme trypanothione reductase. Further structural modifications will be necessary to improve the in vivo activity of the naphthothiophenquinones.
9-Benzylidene-naphtho[2,3-b]thiophen-4-ones as novel antimicrotubule agents - Synthesis, antiproliferative activity, and inhibition of tubulin polymerization
Zuse, Anne,Schmidt, Peter,Baasner, Silke,B?hm, Konrad J.,Müller, Klaus,Gerlach, Matthias,Günther, Eckhard G.,Unger, Eberhard,Prinz, Helge
, p. 7816 - 7825 (2006)
A novel series of 9-benzylidene-naphtho[2,3-b]thiophen-4-ones and structurally related compounds were synthesized and evaluated for their ability to inhibit tubulin polymerization. The 4-hydroxy-3,5-dimethoxy-benzylidene analogue 15d was identified as a potent cytotoxic agent in an assay based on K562 leukemia cells. Antiproliferative activity of 15d and the 2,4-dimethoxy-3-hydroxy-benzylidene analogue 15e was additionally evaluated against a panel of 12 tumor cell lines, including multidrug resistant phenotypes. All resistant cell lines were sensitive to these compounds. Concentration-dependent flow cytometric studies showed that K562 cells as well as KB/HeLa cells treated by 15d were arrested in the G2/M phases of the cell cycle. Moreover, four compounds strongly inhibited tubulin polymerization with activities higher or comparable to those of the reference compounds. In competition experiments, the most active compounds strongly displaced radiolabeled colchicine from its binding site in the tubulin, showing IC 50 values virtually 3- to 4-fold lower than that of colchicine.
A new pseudo rubrene analogue with excellent film forming ability
Zhang, Xiaotao,Meng, Qing,He, Yudong,Wang, Chengliang,Dong, Huanli,Hu, Wenping
, p. 631 - 635 (2011)
A novel pseudo rubrene analogue, 6,11-di(thiophen-2-yl)-tetracene-5,12- dione (DTTDO) was synthesized, in which two thienyl groups and two carbonyl groups replacing four phenyl groups in the rubrene molecule were connected to the backbone of tetracene. This compound was characterized by single crystal X-ray structure analysis, thermogravimetric analysis, absorption spectra and electrochemical measurements. Unlike rubrene, DTTDO exhibited excellent film forming ability by normal vacuum deposition, indicating its promising applications in organic thin film transistors.
Cascade Oxidative C?H Annulation of Thiophenes: Heck-Type Pathway Enables Concise Access to Thienoacenes
Chen, Xingyu,Yang, Yudong,Han, Weiguo,Huang, Quan,Huang, Zhenmei,You, Jingsong
supporting information, p. 12371 - 12375 (2021/05/03)
The pursuit of efficient synthetic route to thienoacenes represents an appealing yet challenging task in the fields of both organic synthetic chemistry and organic functional materials. In this work, we disclose a rhodium-catalyzed cascade C?H annulation of phenacyl phosphoniums with (benzo)thiophenes via a Heck-type pathway to provide a new class of planar thienoacenes, which involves the formation of three Caryl-Caryl bonds and one Caryl?O bond in a single operation. The neutral S,O-heteroacenes exhibit superior stability and adopt a herringbone-like packing mode with efficient π–π stacking in the crystals, suggesting their potential in organic semiconducting materials. This work first exemplifies the superiority of cascade oxidative C?H annulation involving a Heck-type pathway in the development of concise access to heteroacenes.
Metal-Free Arylation-Lactonization Sequence of γ-Alkenoic Acids Using Anilines as Aryl Radical Precursors
Felipe-Blanco, Diego,Gonzalez-Gomez, Jose C.
supporting information, p. 7735 - 7744 (2019/12/24)
The presence of salicylic acid (10 mol-%) and H2O (10 equiv.) significantly improves the arylation-lactonization sequence of γ-alkenoic acids with in situ formed diazonium salts (from bench stable anilines). The reaction is finished in less than 5 h without thermal or photochemical activation, giving access to a variety of γ,γ-disubstituted butyrolactones. The protocol is user-friendly and can be used at gram-scale or adapted to transform alkenols into phthalanes. Control experiments revealed that aryl radicals participate in the reaction and a plausible mechanism is proposed to include this and other mechanistic investigations, for the catalyzed and the background reaction.
Synthesis and characterization of benzannelated thienyl oligomers
Amaladass, Pitchamuthu,Clement, J. Arul,Mohanakrishnan, Arasambattu K.
scheme or table, p. 3798 - 3810 (2009/04/07)
An array of 1,3-diarylbenzo[c]thiophenes have been synthesized by the ring-opening of lactones followed by thionation using Lawesson's reagent with concurrent intramolecular cyclization. Photophysical studies of the various benzo[c]thiophene analogues are presented. The results of a cyclic voltammetric investigation of the benzo[c]thiophenes are also reported.
Heterocyclic compounds, their production and use as tachykinin reactor antagonists
-
, (2008/06/13)
A novel compound represented by the formula: STR1 wherein Ring A and Ring B respectively stands for an optionally substituted homo- or hetero-cyclic ring, and at least one of them stands for an optionally substituted heterocyclic ring stand; Ring C stands for an optionally substituted benzene ring; R stands for a hydrogen atom or an optionally substituted hydrocarbon residue; one of X and Y stands for --NR1 -- (R1 stands for a hydrogen atom or an optionally substituted hydrocarbon residue) or --O--, and the other stands for--CO-- or --CS--, or one of them stands for --N= and the other stands for =CR2 -- (R2 stands for a hydrogen atom, a halogen atom, an optionally substituted hydrocarbon residue, an optionally substituted amino group or an optionally substituted hydroxyl group); n denotes 1 or 2 or salts thereof which have an excellent tachykinin receptor antagonistic action and inhibitory action on plasma extravasation.
Novel antiasthmatic agents with dual activities of thromboxane A2 synthetase inhibition and bronchodilation. 1. 2-[2-(1-imidazolyl)alkyl]- 1(2H)-phthalazinones
Yamaguchi,Kamei,Koga,Akima,Kuroki,Ohi
, p. 4052 - 4060 (2007/10/02)
A number of 4-substituted 2-[ω-(1-imidazolyl)alkyl]-1(2H)-phthalazinones were synthesized in order to develop agents possessing both thromboxane A2 synthetase inhibitory and bronchodilatory activities. The pharmacological evaluation of these compounds disclosed that they have both activities to various extents. Both activities were slightly dependent on the length of the 2-substituents and largely affected by the nature of the 4-substituents. Compounds bearing phenyl and thienyl groups exhibited relatively high and well-rounded activities. Among these compounds, 12j and 15f were found to be the most effective agents having well-rounded activities in vitro and in vivo. Introduction of a carboxyl group reduced both activities contrary to our expectation. 4-(3-Pyridyl)phthalazinone 18b was of particular interest because of unexpectedly high in vivo activities in spite of an absence of significant in vitro activities.
