Results 131 to 140 of about 70,439 (171)

Alternative partial synthesis of bisindole alkaloids

Tetrahedron Letters, 1990
Abstract Indoline derivatives of the pericyclivine series are oxidized at position 6 with DDQ; the corresponding alcohols are coupled with nucleophilic indolines under acid conditions to yield dimers similar to undulatine.
G. Massiot, J.M. Nuzillard, B. Richard, L. Le Men-Olivier   +3 more
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Ceridimine: a novel type of bisindole monoterpene alkaloid

Journal of the Chemical Society, Chemical Communications, 1986
The structure determination and synthesis of ceridimine (1), a novel type of bisindole monoterpene alkaloid isolated from Pagiantha cerifera(Apocynaceae), are reported.
Genevi�ve Baudouin, Fran�ois Tillequin, Maryse Bert, Michel Koch   +3 more
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Bisindole alkaloids.

The Alkaloids. Chemistry and biology, 2007
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.
Kam, Toh Seok, Choo, Yeun Mun
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Bisindole alkaloid artifacts from Gonioma malagasy

Tetrahedron Letters, 2013
Abstract Three new bisindole alkaloids ( 1 – 3 ), possessing a rare carbon skeleton formed by two indole moieties fused via a dihydropyran unit, were isolated from the alkaloid extract of the stem bark of Gonioma malagasy . Their structure and absolute configuration were assigned thanks to a combination of one and two dimensional NMR spectroscopy ...
Beniddir, Mehdi A, Martin, M. T., Tran, Huu Dau Marie Elise, Rasoanaivo, Philippe, Guéritte, Francoise, Litaudon, Marc   +5 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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New Bisindole Alkaloids from Petchia Ceylanica

HETEROCYCLES, 1988
Two new bisindole alkaloids, ceylanine and ceylanicine, habe been isolated from Petchia ceylanica and their structures have been established on the basis of spectroscopic ...
_ Atta-ur-Rahman, Azra Pervin, Anjun Muzaffar, Kuruneruge Tuley Dayanada de Silva, Wellage Susil Jayalath Silva   +4 more
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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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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
openaire   +1 more source