leuconotis/alkaloid

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11 rezultatov

Rhazinilam-Leuconolam-Leuconoxine Alkaloids from Leuconotis griffithii.

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Prijava / prijava

Eight new indole alkaloids (1-8) belonging to the rhazinilam-leuconolam-leuconoxine group, in addition to 52 other alkaloids, were isolated from the stem-bark extract of Leuconotis griffithii, viz., nor-rhazinicine (1), 5,21-dihydrorhazinilam-N-oxide (2), 3,14-dehydroleuconolam (3), and leuconodines

Aspidospermatan-aspidospermatan and eburnane-sarpagine bisindole alkaloids from Leuconotis.

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Prijava / prijava

Leucofoline and leuconoline, representing the first members of the aspidospermatan-aspidospermatan and eburnane-sarpagine subclasses of the bisindole alkaloids, respectively, were isolated from the Malayan Leuconotis griffithii. The structures of these bisindole alkaloids were established using NMR

Eucophylline, a Tetracyclic Vinylquinoline Alkaloid from Leuconotis eugenifolius.

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Prijava / prijava

Eucophylline (1), a new tetracyclic vinylquinoline alkaloid, was isolated from the bark of Leuconotis eugenifolius together with leucophyllidine (2). The structure and absolute configuration of 1 were elucidated on the basis of 2D NMR correlations and simulated CD analysis. Leucophyllidine (2)

Leucophyllidine, a cytotoxic bisindole alkaloid constituted from the union of an eburnan and a new vinylquinoline alkaloid.

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Prijava / prijava

A cytotoxic bisindole alkaloid possessing an unprecedented structure constituted from the union of an eburnan half and a novel vinylquinoline alkaloid has been isolated from Leuconotis griffithii. The structure was established by analysis of the spectroscopic data and confirmed by X-ray diffraction

Leucoridines A-D, cytotoxic Strychnos-Strychnos bisindole alkaloids from Leuconotis.

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Prijava / prijava

Four new bisindole alkaloids of the Strychnos-Strychnos type, leucoridines A-D (1-4), were isolated from the stem-bark extract of Leuconotis griffithii. Alkaloids 1-4 showed moderate cytotoxicity against drug-sensitive and vincristine-resistant human KB cells.

Bisleuconothines B-D, Modified Eburnane-Aspidosperma Bisindole Alkaloids from Leuconotis griffithii.

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Prijava / prijava

Three new bisindole alkaloids, bisleuconothines B-D (1-3), were isolated from the bark of Leuconotis griffithii. Their structures were elucidated by 1D and 2D NMR spectroscopy and DFT calculations. Bisleuconothine B (1) is the first monoterpene indole alkaloid dimer featuring bridges between both

Leucophyllinines A and B, bisindole alkaloids from Leuconotis eugeniifolia.

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Prijava / prijava

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

Bisleuconothine A, an eburnane-aspidosperma bisindole alkaloid from Leuconotis griffithii.

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Prijava / prijava

A new bisindole alkaloid, bisleuconothine A (1) consisting of an eburnane-aspidosperma type skeleton, was isolated from the bark of Leuconotis griffithii. The structure including absolute stereochemistry was elucidated on the basis of 2D NMR data and X-ray analysis. Bisleuconothine A (1) showed cell

Antiplasmodial indole alkaloids from Leuconotis griffithii.

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Prijava / prijava

A new indole alkaloid, leucoridine A N-oxide (1), consisting of two units of a strychnan type of skeleton, was isolated from the leaves of Leuconotis griffithii. Its structure was elucidated by various spectroscopic means such as NMR and MS, and also by chemical means. Antiplasmodial activity

Leuconicines A-G and (-)-eburnamaline, biologically active strychnan and eburnan alkaloids from Leuconotis.

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Prijava / prijava

Seven new indole alkaloids of the Strychnos type, leuconicines A-G (1-7), and a new eburnan alkaloid, (-)-eburnamaline (8), were isolated from the stem-bark extract of two Malayan Leuconotis species. The structures of these alkaloids were established using NMR and MS analysis and in the case of 8

Bisleuconothine A Induces Autophagosome Formation by Interfering with AKT-mTOR Signaling Pathway.

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Prijava / prijava

We have previously reported that bisleuconothine A (Bis-A), a novel bisindole alkaloid isolated from Leuconotis griffithii, showed cytostatic activity in several cell lines. In this report, the mechanism of Bis-A-induced cytostatic activity was investigated in detail using A549 cells. Bis-A did not

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