Rauwolfia vomitoria

The isolation of a new reserpine-type alkaloid from Rauwolfia vomitoria Afz. named neonorreserpine has recently been reported however, the stereochemistry of its substituents attached to ring E has not yet been established (86). 

Reserpic acid (120) has been isolated from Rauwolfia vomitoria Afz. (87). The authors stated that the compound was not a secondary product of the isolation, however, the question is still open. 

The isolation of methyl reserpate (121) from Rauwolfia vomitoria Afz. (42) and R. obscura K. Schum. (88) and of methyl deserpidate (122) from Rauwolfia obscura K.Schum. (89) has been reported by Court and coworkers. It should be mentioned that these compounds may not be primary products but only artifacts formed by hydrolysis of reserpine (109) and deserpidine (110), respectively. 

The enzyme responsible for the stereospecific condensation of trypt-amine and secologanin 34) was called strictosidine synthase, and its presence was demonstrated by Treimer and Zenk 194) in a number of indole alkaloid-producing plants, including Amsonia salicifolia, Catharanthus roseus, Ochrosia elliptica, Rauwolfia vomitoria, Rhazya orientalis, Stem-madenia tomentosa. Vinca minor, and Voacanga africana. Enzyme activity as high as 1698 pkat/mg protein was observed for O. elliptica. No... 

Sarpagine-Ajmaline-Picraline Group. Vincamajine and quebrachidine have been found to occur in the leaves and stem bark of Alstonia odontophora,59 normacusine B occurs in Strychnos rubiginosa,ss and vellosimine in Rauwolfia vomitoria.lla R. volkensii contains quaternine, nortetraphyllicine, peraksine,... 

Ajmaline isolated from Rauwolfia sp. roots Rauwolfia serpentine Benth., Rauwolfia vomitoria Afr., Rauwolfia canescens L. 

Reserpine is isolated from its plant producers by using a nonaqueous solvent process, using, for example, boiling methanol extraction of the African root Rauwolfia vomitoria. Naturally, these extractions are carried out under countercurrent methods. The methanol extract is concentrated and acidified with 15% acetic acid and then treated with petroleum naphtha to remove impurities. Extraction is made using ethylene dichloride. The solvent is neutralized with dilute sodium carbonate, evaporated to drive off the ethylene dichloride, and further evaporated to crystallize the crude reserpine crystals that are then crystallized. 

In spite of some discrepancies between the reported physical constants, it seems more than likely that deacetyldeformylakuammiline (Base A), isolated from Rauwolfia vomitoria,91 is identical with strictamine (168), in view of its reported chemical properties. 

Vomifoline has been isolated63" from the leaves of Rauwolfia vomitoria collected from the Ivory Coast, and a re-examination of its chemical behaviour and its physical properties has shown that it is identical with peraksine (177) previously the alternative hemiacetal structure had been accepted as the structure of vomifoline. 

A new weak base, neonor-reserpine, from Rauwolfia vomitoria, is regarded as a stereoisomer of psuedoreserpine 45 since the new base appears to have the epiallo stereochemistry, it must differ from pseudoreserpine in the stereochemistry at one or more of the positions C-16, C-17, and C-18. 

The roots of a variety of Rauwolfia vomitoria Afzel. collected in Guinea yielded a small amount of a base, seredine, C23H30O5N2, mp 308°, t ]D- 1° (CHCI3), and pK 6.69 (33). 

Rauwolfia vomitoria Bubbun Fleadache, migraine (B), Mental disorders. Lice, Latex in nasal route leaves... 

Vomifoliol (97) isolated from Rauwolfia vomitoria appears to be a degradation product of abscisic acid and possibly a precursor of theaspirone. Damas-cenone, a minor component of Bulgarian rose oil, was shown to be the cross-conjugated isomer (98) of dehydroionone. A tetrahydro-damascenone was prepared by treating a-ionone-7,8-oxide with hydrazine. ... 

Investigating alkaloids of the Aspidosperma species, Arndt has identified carapanaubine in the bark of A. rigidum Rusby (31). Cara-panaubine and isocarapanaubine have been found to accompany rauvoxine and rauvoxinine (C23H28N20e), an isomeric pair of oxindole alkaloids first isolated from the leaves of Rauwolfia vomitoria Afz. (32, 33). 

It has been pointed out that the C n.m.r. data reported for ajmalinol, a new alkaloid of Rauwolfia vomitoria, are inconsistent with the proposed 11-hydroxyajmaline structure. Some of the data are very close to those reported for ajmaline itself, others are consistent neither with an ajmaline nor an 11-hydroxyajmaline structure. Hence the structure of ajmalinol is at present obscure. 

Rauvoxine, C28H28N2O6 210-211 +98° (CHCI3) Rauwolfia vomitoria Afzel. 28... 

Ajtnalicine is found in plants belonging to Apocynaceae, namely, Catharanthus roseus, Rauwolfia serpentina, and Rauwolfia vomitoria. Ajmalicine was first isolated from yohimbe bark and is one of the principal alkaloids of Catharanthus roseus and widely used to treat circulatory disorders [6] (Fig. 20.3). Ajmalicine is... 

The alkaloid reserpine is obtained naturally from the rhizome and roots of Rauwol-fia spp. Rauwolfia serpentina is a small shrub belonging to Apocynaceae family and found in India, Burma, Java, and Thailand. Rauwolfia vomitoria is widely grown in Congo, Africa, and contains more than twice quantity of reserpine. Ninety percent of reserpine is present in the roots and only 10 % in the stem and leaves [107] (Fig. 20.7a). 

Campbell JIA, MortensenA, MolgaardP (2006) Tissue lipid lowering-effect of a traditional Nigerian anti-diabetie infusion of Rauwolfia vomitoria foilage and Citrus aurantium fruit. J Ethnopharmaeol 104 379-386... 

The alkaloidal constituents of the stem bark of Nigerian Rauwolfia vomitoria have been isolated and characterized, some of which are described in Table 5.2.3 (129). 

Table 5.2.3. Principal alkaloid obtained from 1.5 kg stem bark of Rauwolfia vomitoria...

Sabri N N, Court W E 1978 Stem alkaloids of Rauwolfia vomitoria. Phytochemistry 17 2023-2026... 

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