Synthesis and antifungal activity of 5-arylamino-4,7-dioxobenzo[b]thiophenes
摘要:
5-Arylamino-4,7-dioxobenzo[b]thiophenes 3-6 were synthesized and tested for in vitro antifungal activity against Candida and Aspergillus species. 5-Arylamino-6-chloro-2-(methoxycarbonyl)-4,7-dioxobenzo[b]thiophenes 5 showed, in general, more potent antifungal activity against Candida species than the other 4,7-dioxobenzo[b]thiophenes 3, 4 and 6. The results suggest that 5-arylamino-4,7-dioxobenzo[b]thiophenes would be potent antifungal agents. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and antifungal activity of 5-arylamino-4,7-dioxobenzo[b]thiophenes
摘要:
5-Arylamino-4,7-dioxobenzo[b]thiophenes 3-6 were synthesized and tested for in vitro antifungal activity against Candida and Aspergillus species. 5-Arylamino-6-chloro-2-(methoxycarbonyl)-4,7-dioxobenzo[b]thiophenes 5 showed, in general, more potent antifungal activity against Candida species than the other 4,7-dioxobenzo[b]thiophenes 3, 4 and 6. The results suggest that 5-arylamino-4,7-dioxobenzo[b]thiophenes would be potent antifungal agents. (c) 2005 Elsevier Ltd. All rights reserved.
Studies on Quinones. Part 30. Synthesis of Benzo[<i>b</i>]thiophene-4, 7-Quinones
作者:Jaime A. Valderrama、Claudio Valderrama
DOI:10.1080/00397919708006822
日期:1997.6
Abstract The synthesis of a variety of benzo[b]thiophene-4, 7-quinones (4a-f), by oxidative demethylation of the corresponding 4, 7-dimethoxybenzo[b]thiophenes (3a-f), with cerium (IV) ammonium nitrate is reported. Heterocycles (3a, b), were prepared by cyclization of the corresponding 2, 5-dimethoxy-6-nitrobenzaldehyde (1a), and 2, 5-dimethoxy-6-nitroacetophenone (1b), with methyl thioglycolate.
The synthesis of kigelinone thiophene analogs and related naphtho[2,3-b]thiophene-4,9-quinones from 2- substituted 4,7-dimethoxybenzo[b]thiophenes via an oxidative deprotection, Diels-Alder, and oxidative aromatization reaction sequence is reported. The 2-substituted naphtho[2,3-b]thiophene-4,9-quinones display significant antitumoractivity in the range IC50 1.1-47 μM on a panel of four distinct human
Solvent-Free Microwave Synthesis of 3-(4-Benzo[b]thiophene-2-carbonyl)-1-piperazinyl-1-benzo[b]thiophen-2-yl-1-propanones. New Hetero Bis-Ligands with Potential 5-HT1A Serotonergic Activity
作者:Hernán Pessoa-Mahana、Johann Kosche C.、Nadia Ron H.、Gonzalo Recabarren-Gajardo、Claudio Saitz B.、Ramiro Araya-Maturana、C. David Pessoa-Mahana
DOI:10.3987/com-08-11326
日期:——
A novel series of 2-benzothiophenealkylpiperazine derivatives 11 (a-d) with potential affinity at 5-HT1A serotonin receptors have been synthesized via solvent-free, microwave-promoted Michael addition of benzo[b]thiophene piperazine derivatives 6(a-c) to substituted benzo[b]thiophen-2-yl propenones 10(b,c).
Studies on Quinones. Part 38: synthesis and leishmanicidal activity of sesquiterpene 1,4-Quinones
作者:Jaime A Valderrama、Julio Benites、Manuel Cortés、Hernán Pessoa-Mahana、Eric Prina、Alain Fournet
DOI:10.1016/j.bmc.2003.08.011
日期:2003.11
The reaction of (+)-euryfuran 1 with several benzo-, naphtho- and benzo[b]thiophene-1,4-quinones in acetic acid yields the corresponding euryfuryl-1.4-quinones 3, 5, 7, 8, 10, 12, and 14. The structure of compounds 7, 8, 12, and 14 was assigned through 2D NMR H-1-C-13 HMBC experiments. The influence of the acidity of the solvent upon the reactivity and regioselectivity of the quinones to the oxidative coupling reaction, is discussed. The in vitro activity of the euryfurylquinones and their corresponding precursors against Leishmania amazonensis is described. (C) 2003 Elsevier Ltd. All rights reserved.
Synthesis and antiprotozoal activity of naphthofuranquinones and naphthothiophenequinones containing a fused thiazole ring
作者:Ricardo A. Tapia、Luz Alegria、Carlos D. Pessoa、Cristian Salas、Manuel J. Cortés、Jaime A. Valderrama、Marie-Elisabeth Sarciron、Félix Pautet、Nadia Walchshofer、Houda Fillion
DOI:10.1016/s0968-0896(03)00122-6
日期:2003.5
The synthesis of tetracyclic quinones 10a,b, 14a,b, 19a,b and 20a,b is described. The preparations involve regioselective Diels-Alder reactions via trapping the thiazole o-quinodimethane 9 with several benzofuranquinones and benzothiophenequinones. The structure of the regioisomers was assigned through 2D NMR H-1-C-13 HMBC experiments performed on 10a and 14a. Compounds 10a,b, 14a as well as phenol I and the starting quinones 2, 5, 7 and 15 are evaluated against Leishmania sp., Toxoplasma gondii and THP-1 cells. Almost all the tested compounds exhibit significant antiprotozoal activities with lower cytotoxicities than the reference compounds. Among them, quitiones 2 and 14a possess the best activities towards L. donovani and T. gondii with the lowest toxicities. (C) 2003 Elsevier Science Ltd. All rights reserved.