87084-40-0Relevant academic research and scientific papers
A concise synthesis of indolic enamides: coscinamide A, coscinamide B, and igzamide
Ma, Yuelong,Yakushijin, Kenichi,Miyake, Fumiko,Horne, David
, p. 4343 - 4345 (2009)
A concise synthesis of indolic enamides coscinamide A, coscinamide B, and the brominated tryptamine derivative igzamide is described. Both E- and Z-isomers of these natural compounds were obtained during the thermally assisted dehydration reaction and wer
Reduction of 2,5-bis(3′-indolyl)pyrazines to 2,5-bis(3′- indolyl)piperazines: Synthesis of bisindolylpiperazine marine alkaloids dragmacidin A, B, and C
Tonsiengsom, Fay,Miyake, Fumiko Y.,Yakushijin, Kenichi,Horne, David A.
, p. 49 - 54 (2006)
A concise total synthesis of the bisindole alkaloids drag-macidin A, B and C is described that centers on the preparation and reduction of 2,5-bis(3′-indolyl)pyrazines to 2,5-bis(3′-indolyl)piperazines. Georg Thieme Verlag Stuttgart.
The potential of achiral sponge-derived and synthetic bromoindoles as selective cytotoxins against PANC-1 tumor cells
Lorig-Roach, Nicholas,Hamkins-Indik, Frances,Johnson, Tyler A.,Tenney, Karen,Valeriote, Frederick A.,Crews, Phillip
, p. 217 - 223 (2017/11/30)
Our quest to isolate and characterize natural products with in vitro solid tumor selectivity is driven by access to repositories of Indo-Pacific sponge extracts. In this project an extract of a species of Haplosclerida sponge obtained from the US NCI Natural Products Repository displayed, by in vitro disk diffusion assay (DDA) and IC50 determinations, selective cytotoxicity with modest potency to a human pancreatic cancer cell line (PANC-1) relative to the human lymphoblast leukemia cell line (CCRF-CEM). Two brominated indoles, the known 6-bromo conicamin (1) and the new derivative, 6-Br-8-keto-conicamin A (2), were identified and 2 (IC50 1.5 μM for the natural product vs 4.1 μM for the synthetic material) was determined to be responsible for the cytotoxic activity of the extract against the PANC-1 tumor cell line. The new natural product and ten additional analogs were prepared for further SAR testing.
Metabolism of the phytoalexins camalexins, their bioisosteres and analogues in the plant pathogenic fungus Alternaria brassicicola
Pedras, M. Soledade C.,Abdoli, Abbas
, p. 4541 - 4549 (2013/07/26)
The metabolism of the phytoalexins camalexin (1), 1-methylcamalexin (10) and 6-methoxycamalexin (11) by Alternaria brassicicola and their antifungal activity is reported. This work establishes that camalexins are slowly biotransformed (ca. six days) to the corresponding indole-3-thiocarboxamides, which are further transformed to the indole-3-carboxylic acids. These metabolites are substantially less inhibitory to A. brassicicola than the parent camalexins, indicating that these enzyme-mediated transformations are detoxifications. In addition, analyses of the metabolism of synthetic isomers and bioisosteres of camalexin (1) indicate that isomers of camalexin in the thiazole ring are not metabolized. Based on these results, the potential intermediates that lead to formation of indole-3-thiocarboxamides are proposed.
Synthesis of 5-(3-indolyl)oxazole natural products. Structure revision of Almazole D
Miyake, Fumiko,Hashimoto, Michinao,Tonsiengsom, Sorasaree,Yakushijin, Kenichi,Horne, David A.
experimental part, p. 4888 - 4893 (2010/08/06)
The synthesis and utility of β-oxotryptamine and β-oxytryptophan ester synthons provide a convenient entry to 5-(3-indolyl)oxazole natural products leading to a structure revision of almazole D.
Methods for making bis-heterocyclic alkaloids
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Page column 0096, (2010/11/30)
Methods for making bis-heterocyclic compounds, especially bis-heterocyclic compounds having five and six-membered heterocyclic linkers are described. Also described are methods for making an alpha amino ketone synthon that enables facile syntheses of bisindole compounds, including topsentins and dragmacidins.
A facile synthesis of dragmacidin B and 2,5-bis(6′-bromo-3′-indolyl)piperazine
Miyake, Fumiko Y.,Yakushijin, Kenichi,Home, David A.
, p. 3185 - 3187 (2007/10/03)
(matrix presented) A short synthesis of dragmacidin B (1), 2,5-bis(6′-bromo-3′-indolyl)piperazine (2), and corresponding didebromo analogues 8 and 9 is described. The key steps involve the dimerization of oxotryptamines 4 and 11 to give bis(indolyl)pyrazines 5 and 12, which upon selective reduction and reductive methylation with sodium cyanoborohydride afforded the requisite piperazine natural products.
Synthesis of a bis-pyrrolo-quinone structure analogue to wakayin
Barret, Roland,Roue, Nathalie
, p. 3889 - 3890 (2007/10/03)
The addition of different amines to indole-4,7-quinone is studied. The application of this reaction with indolyl-2-oxoethylamine lead to the preparation of an analogue of wakayin 2.
