据报道,在环境条件下吲哚核心的电氧化重建,导致色胺酮的构建。这种电化学策略通过使用市售的 NH-吲哚原料作为起始材料,简化了分子骨架跳跃。此外,这种骨骼重建的综合价值通过不同的进一步变换得到了证明。涉及控制实验和循环伏安研究的初步机理研究表明电的必要性以及氧气和 TEMPO 的重要性,从而揭示了可能的反应途径。
The numerous bioactivities exhibited by tryptanthrins led chemists to develop synthetic approaches towards this important scaffold. In particular, conversion of isatins into tryptanthrins has been the subject of several studies. In this context, by using iodine and potassium hydroxide at room temperature, we have discovered a simple way to convert isatin and seven of its 5-substituted derivatives (Bu
Cu-Catalyzed Synthesis of Tryptanthrin Derivatives from Substituted Indoles
作者:Chen Wang、Lianpeng Zhang、Anni Ren、Ping Lu、Yanguang Wang
DOI:10.1021/ol401144m
日期:2013.6.21
A concise method for the preparation of tryptanthrins fromindoles via the copper-catalyzed aerobic oxidation is described. The reactions can be carried out under mild reaction conditions with varying functional group tolerance.
A Biomimetic, One-Step Transformation of Simple Indolic Compounds to <i>Malassezia</i>-Related Alkaloids with High AhR Potency and Efficacy
作者:Nikitia Mexia、Stamatis Koutrakis、Guochun He、Alexios-Leandros Skaltsounis、Michael S. Denison、Prokopios Magiatis
DOI:10.1021/acs.chemrestox.9b00270
日期:2019.11.18
Malassezia furfur isolates from diseased skin preferentially biosynthesize compounds which are among the most active known aryl-hydrocarbon receptor (AhR) inducers, such as indirubin, tryptanthrin, indolo[3,2-b]carbazole, and 6-formylindolo[3,2-b]carbazole. In our effort to study their production from Malassezia spp., we investigated the role of indole-3-carbaldehyde (I3A), the most abundant metabolite
Synthesis of substituted tryptanthrins via oxidation of isatin and its derivatives
作者:T. V. Moskovkina、M. V. Denisenko、A. I. Kalinovskii、V. A. Stonik
DOI:10.1134/s1070428013120051
日期:2013.12
acetonitrile gave indolo[2,1-b]quinazoline-6,12-dione (tryptanthrin) and its 2,8-dimethyl-, 2,8-dibromo-, and 2,8-diiodo derivatives. Oxidative coupling of 5,7-dichloroisatin with isatin under analogous conditions afforded 2,4-dichloroindolo[2,1-b]quinazoline-6,12-dione, while 1,4-dichloroindolo[2,1-b]quinazoline-6,12-dione and 1,4-dichloro-8-methylindolo[2,1-b]quinazoline-6,12-dione were obtained by
在无水乙腈中用高锰酸钾氧化isatin及其5取代的类似物,得到吲哚[2,1 - b ]喹唑啉-6,12-二酮(色胺酮)及其2,8-二甲基-,2,8-二溴-和2,8-二碘衍生物。在类似条件下,将5,7-二氯靛红与靛红氧化偶联,得到2,4-二氯吲哚[2,1 - b ]喹唑啉-6,12-二酮,而1,4-二氯吲哚[2,1 - b ]喹唑啉-6通过将4,7-二氯靛红与靛红和5-甲基靛红分别氧化偶联,得到1,2,2-二酮和1,4-二氯-8-甲基吲哚并[2,1- b ]喹唑啉-6,12-二酮。
Divergent Synthesis of Methylisatoid and Tryptanthrin Derivatives by Ph<sub>3</sub>P–I<sub>2</sub>-Mediated Reaction of Isatins with and without Alcohols
A novel phosphonium-mediated reaction of isatins is described. In the presence of alcohol, the reaction proceeds to furnish C-12 modified tryptanthrin derivatives. Without alcohol, self-dimerization of isatins gives rise to tryptanthrin and its analogs. This divergent and step-economic approach provides a facile access to diverse indoloquinazoline structures including the natural alkaloids, methylisatoid