Results 171 to 180 of about 2,460 (195)

Octacycles and Nonacycles from 3-Hydroxy-2,2′-bisindole

The Journal of Organic Chemistry, 2021
3-Hydroxy-2,2'-bisindole undergoes acid- and base-mediated dimerization-skeletal rearrangement processes, generating polyheterocyclic ring systems containing up to nine rings. The mechanistic rationale for these reactions is provided, which infers some overlap with the previously reported reactivity of 3',3″-dihydroxytetraindole under analogous ...
Maurycy Prystupa, Tilo Söhnel, Jonathan Sperry   +2 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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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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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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Bisindoles. 30. Acid condensation of bisindoles with aromatic aldehydes and the synthesis of new endole-containing polyamines

Chemistry of Heterocyclic Compounds, 1993
Reaction of 2,2′-diethoxycarbonyl-bis(5-indolyl)sulfone with benzaldehyde gave an active dibromide — 2,2′diethoxycarbonyl-3,3′-di(bromobenzyl)bis(5-indolyl)sulfone; derivatives of di(bisindolyl)phenylmethane have been prepared by condensation of 2,2′-diethoxycarbonyl-bis (N-methyl-5-indolyl)sulfone with benzaldehyde and p-methoxybenzaldhyde.
N. N. Ovsyannikova, Sh. A. Samsoniya, N. N. Suvorov, N. A. Kogan   +3 more
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New Synthetic Protocol for the Preparation of Unsymmetrical Bisindoles.

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Hanns Martin, Kaiser, Wei Fun, Lo, Abdol Majid, Riahi, Anke, Spannenberg, Matthias, Beller, Man Kin, Tse   +5 more
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Leucophyllinines A and B, bisindole alkaloids from Leuconotis eugeniifolia

Journal of Natural Medicines, 2019
Two new bisindole alkaloids, leucophyllinines A (1) and B (2) consisting of eburnane and quebrachamine-type skeletons were isolated from the bark of Leuconotis eugeniifolia, and their structures were elucidated on the basis of spectroscopic data. Leucophyllinines A and B showed antiplasmodial activities against Plasmodium falciparum 3D7.
Tang, Yiming, Nugroho, Alfarius Eko, Hirasawa, Yusuke, Tougan, Takahiro, Horii, Toshihiro, A. Hadi, A. Hamid, Morita, Hiroshi   +6 more
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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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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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