Results 111 to 120 of about 695 (146)

Biologically active indole and bisindole alkaloids from Tabernaemontana divaricata

Organic & Biomolecular Chemistry, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Kam, Toh-Seok, Pang, Huey-Shen, Lim, Tuck-Meng   +2 more
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Crooksiine, a bisindole alkaloid from Haplophyton crooksii

Phytochemistry, 1991
Abstract Crooksiine, a new bisindole alkaloid with antiacetylcholinesterase activity was isolated from Haplophyton crooksii . Its structure was established utilizing spectrometric methods.
Mohamad Mroue, Maktoob Alam
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A partial synthesis of the Alstonia bisindole alkaloid villalstonine

Tetrahedron Letters, 1994
Abstract The partial synthesis of villalstonine 1 has been completed by coupling the macroline equivalent 2a with plant-derived (+)-pleiocarpamine 3 in 0.2N aq. hydrochloric acid in the presence of fluoride ion.
Yingzhi Bi, James M. Cook, Philip W. LeQuesne   +2 more
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Chapter 4 Bisindole Alkaloids

2006
Publisher Summary This chapter provides an overview on bisindole alkaloids. The indole–indole and tryptamine–tryptamine type, and related alkaloids are discussed. Tryptamine–tryptamine type with an additional monoterpene unit and related alkaloids are briefly discussed.
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Biomimetic synthesis and structure of the bisindole alkaloid alstonisidine

Journal of the Chemical Society, Chemical Communications, 1972
Alstonisidine, a bisindole alkaloid from Alstonia muelleriana, is assigned the revised structure (II) on the basis of its biomimetic synthesis from quebrachidine (III) and macroline (IV).
David E. Burke, James M. Cook, P. W. Le Quesne   +2 more
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Vincazalidine A, a unique bisindole alkaloid from Catharanthus roseus

Journal of Natural Medicines
A new dimeric indole alkaloid, vincazalidine A consisting of an aspidosperma type and a modified iboga type with 1-azatricyclo ring system consisting of one azepane and two piperidine rings coupled with an oxazolidine ring was isolated from Catharanthus roseus, and the structure including absolute stereochemistry was elucidated on the basis of ...
Yusuke, Hirasawa, Ayaka, Kase, Akie, Okamoto, Keigo, Suzuki, Mizuki, Hiroki, Toshio, Kaneda, Nahoko, Uchiyama, Hiroshi, Morita   +7 more
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Partial synthesis of the antiamoebic bisindole alkaloid (−)-macrocarpamine

Tetrahedron Letters, 1996
Abstract The partial synthesis of the antiamoebic bisindole alkaloid (−)-macrocarpamine 1 has been completed by coupling (−)-anhydromacrosalhine-methine 2 with plant-derived (+)-pleiocarpamine 3 in anhydrous 0.2 N HCl in THF in 75% yield.
Tong Gan, James M. Cook
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New Bisindole Alkaloids from Tabernaemontana corymbosa

Journal of Natural Products, 2002
Ten new bisindole alkaloids of the vobasinyl-ibogan type, viz., conodiparines A-F (1-6), conodutarines A and B (7, 8), and cononitarines A and B (9, 10), were obtained from the leaf extract of the Malayan species Tabernaemontana corymbosa. The structures were determined using NMR and MS analysis.
Toh-Seok, Kam, Kooi-Mow, Sim, Huey-Shen, Pang   +2 more
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Syntheses of the Bisindole Alkaloids of the Genera Borreria and Flindersia

2014
Abstract The flinderoles and their structural isomers, the borreverines, have intriguing chemical structures and promising biological activity. These indole alkaloids each contain multiple stereocenters that challenge synthetic chemists to develop new reaction methods. Proven antimalarial activity further established the synthesis of these targets as
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The bisindole alkaloid catharine

Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry, 1976
J. Guilhem, A. Ducruix, C. Riche, C. Pascard   +3 more
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