Alkaloids monoterpenoid

Makonine shares many of the characteristics of aristotelinone (60), but has one additional olefinic carbon atom, and the non-indolic nitrogen appears to be tertiary. Its structure (61) becomes clear from its formation by the oxidation of aristotelinone 

Two new alkaloids have also been isolated from Borreria 44 

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The family Rubiaceae consists of about 450 genera and 6500 species of tropical and subtropical trees, shrubs, climbers, and herbs that are known to abound with iri-doid glycosides (monoterpenoid alkaloids, tannins, and anthraquinones). When looking for Rubiaceae in field collection, one is advised to look for plants with opposite simple leaves with an interpetiolar stipule, tubular flowers, which are often white, and capsules, berries, or drupes. 

Birds Taiwan stick insect Monoterpenoid alkaloid actinidine Chow and Lin,... 

Leonard, J. 1999. Recent progress in the chemistry of monoterpenoid alkaloids derived from secologanin. Nature Product Reports, 16 319-338. 

Mass spectral data of some known monoterpenoid alkaloids have been analysed. ... 

Pyranoid monoterpenoid alkaloids have been reviewed, " and halogenated members of this class, (84) and (85), have already been discussed in the halogenated monoterpenoids section. " " The monoterpenoid ether (245) is reported from Artemisia tridentata-, from reported mass spectral data it may well be identical with the previously reported (and uncited) arthole (Vol. 7, p. 20), the characterization of which is still not published. Loliolide (246) is claimed to be an in vivo carotenoid degradation product in Canscora decussata additional spectral data have been published. ... 

Monoterpenoid Alkaloids.—Aristotelia Alkaloids. Fruticosonine is a novel alkaloid, containing an unrearranged monoterpene unit, which occurs48 in Aristotelia fruticosa Hook, f the structure (54) (relative stereochemistry only) was deduced by X-ray crystallography, and confirmed by the synthesis of ( )-fruticosonine... 

Monoterpenoid Alkaloids.—Corynantheine-Heteroyohimbine- Yohimbine Group, and Related Oxindoles. The leaves of Strychnos decussata (Pappe) Gil. contain a new glycosidic alkaloid for which the gross structure (78) has been proposed 52 so far, nothing is known about its stereochemistry. Nevertheless it seems distinctly possible that this alkaloid is a close biosynthetic relative of vallesiachotamine. 

Monoterpenoid Alkaloids.—Aristotelia Alkaloids. Details of the elucidation of the structure of aristone by the X-ray method have been published.39" Aristoserratine, a new, minor alkaloid of A. serrata and A. peduncularis39b is 15-oxoaristoteline (59). Since aristoserratine could not be reduced to aristoteline, the absolute configuration expressed in (59) was deduced from its c.d. spectrum. 

A useful volume on the chemistry of terpenoids and steroids has appeared.1 Nineteen topics in monoterpenoid chemistry are reviewed with a literature coverage to early 1973 the topics are particularly suitable for use in advanced lecture courses and cover biosynthesis, structural elucidation, and synthesis. Monoterpenoid alkaloid chemistry has been reviewed.2... 

The structure of the monoterpenoid alkaloid alangiside (115 R = H) has been confirmed by synthesis of the O-methyl ether (115 R = Me) from secologanin and 3-hydroxy-4-methoxyphenethylamine 202 the isolation of loganic acid from the same plant (Alangium lamarckii) is consistent with biosynthetic theory. 

In Section S, the total syntheses of monoterpenoid alkaloids, alloyohimbone (257) and (+)-... 

Mono- and Sesqui-terpenoid Alkaloids.—Excellent comprehensive reviews on the mono- and sesqui-terpenoid alkaloids have appeared. Reviews on specific groups of monoterpenoid alkaloids (Gentianaceae, Skytanthus acutus" ) are less readily accessible. 

Introductory surveys of these groups form parts of two chapters in an excellent general volume on the chemistry of alkaloids.1,2 A short review dealing with selected alkaloids of potential medicinal interest includes mention of a pyridine alkaloid.3 A review on the use of n.m.r. spectroscopy in structural and conformational elucidation of piperidine, pyridine, and monoterpenoid alkaloids is not readily accessible.4... 

Monoterpenoid Alkaloids.—The numbering system used, for this group is that originally evolved for the yohimbine skeleton and since extrapolated16 to all the skeletal types on the basis of the well-established16 biogenetic relationships between them. 

A very brief review of selected aspects of the monoterpenoid alkaloids was published in Volume 26 of this series in a chapter dealing with pyridine and piperidine alkaloids (2). A partial review has appeared in a textbook on alkaloids (5), and they are briefly discussed in the various reviews published by The Royal Society of Chemistry in the Specialist Periodical Reports The Alkaloids 4-12) and subsequently in Natural Product Reports (13-23). 

As discussed in the previous review (1), it is well established that under certain circumstances monoterpenoid alkaloids are produced from their... 

The restricted space available for these Reports unfortunately does not allow the discussion of a number of topics of interest to monoterpenoid chemists useful reviews of such topics include monoterpenoid alkaloids/ carbazole alkaloids/ isoprenoids and alkaloids of tobacco/" naturally occurring plant coumarins/ the biosynthesis of aromatic hemiterpenes/ and recent developments in the field of naturally occurring aroma components/ The poor quality of the Chemical Abstracts makes it difficult to assess the significance of a number of reviews of potential industrial interest/ A volume in the Methodicum Chimicum series includes a very brief discussion of some monoterpenoids/"... 

Cyclopentanes, Iridoids, Monoterpenoid Alkaloids. ( —)-Bromodihydro-umbellulone (5) ( —)-isoiridomyrmecin (6) ( + )-iridomyrmecin (7) at — 150 loganin penta-acetate Rionomethyl ether bromide the rubidium... 

Papers on the biosynthesis of monoterpenoid alkaloids lie outside the scope of this Report. 

The C9 monoterpenoid alkaloid jasminidine (126) has been isolated from Syringa vulgaris. (+)-Actinidine (127) is obtained by hydroxylamine treatment... 

The new monoterpenoid alkaloid, venoterpine, CgHnON (mp 128°-130°) was isolated in very small yield (0.0008%) from the fruit of this plant. Its structure (Vila) was determined almost exclusively by NMR studies 15). 

A monoterpenoid alkaloid RW 47, CgHnON (mp 130° [a].. 4-27°) isolated from this plant was assigned structure XCIV, largely on the basis of spectral evidence 170). 

Monoterpenoid Alkaloids.—Corynantheine-Heteroyohimbine-Yohimbine Group, and Related Oxindoles. The first recorded extraction of the leaves and twigs of Peschiera laeta Mart, has yielded geissoschizol, a base not previously found in the Peschiera genus. Antirhine and, to a lesser extent, its quaternary Nb-metho-derivative, occur in the bark of Strychnos camptoneura Gilg. et Busse and in Amsonia elliptica, which also contains tetrahydrosecamine, pleiocarpamine,... 

Mould Metabolites Ergot Alkaloids Monoterpenoid Alkaloids... 

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