Studies on Quinones. Part 38: synthesis and leishmanicidal activity of sesquiterpene 1,4-Quinones
摘要:
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.
Studies on Quinones. Part 38: synthesis and leishmanicidal activity of sesquiterpene 1,4-Quinones
摘要:
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.
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
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.
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.