Alkamine

Stereoisomerism in either the alkamine nucleus or the acyl residue has a considerable effect on the pharmacological action of the tropeines and cocaines. Differences in activity of tropine and i/i-tropine and their benzoyl derivatives have been mentioned already, and there seems to be a consensus of opinion that the i/i-cocaines (alkyl- or aryl- acyl esters of 0-ecgonine) are less toxic and more potent local anfesthetics than the corresponding cocaines, derived from 1-ecgonine. ... 

The influence of the acyl group in the production of local anfesthetics has also been discussed by Jo-wett and Pyman, -who point out that this property is sho-wn by alkamine esters of -widely different structure, but possessing the folio-wing characters — ... 

The property of producing local anresthesia is also sho-wn by other products than alkamine esters, e.g., benzyl alcohol and its homologues, saligenin, and the esters of aminoaromatic acids such as the ethyl and diethylaminoethyl esters of 4-aminobenzoie acid. 

While the hydrolytic alkamines, aconine and delphonine, cannot be hydrogenated and have therefore been regarded as saturated, their ultra-violet absorption spectra as bases in solution and in common with those of heteratisine and tetrahydroatisine, show a strong absorption within the range 2,200 to 2,600 A, indicating unsaturation. With the bases in acid solution there is a reduction in intensity and a shift in the position of the absorption. It is assumed that these results arise from association of points of unsaturation with the nitrogen atom, A similar range of absorption is shown by iV-methylpyrrole, as base in solution, but in this case there is no shift in position on acidification. 

Esters of veralrum alkamines. Cevadine, germerine, protoveratridine, protoveratrine, veratridine. 

Veralrum alkamines. These may occur naturally as such, or in the form of the esters, or glucosides of types (1) and (2). Cevine, germine jervine, protoverine, rubijervine, isorubijervine, veratramine. They are all, so far, Cj, compoimds. 

Poethke shows that on alkaline hydrolysis protoveratrine yields acetic, Z-methylethylacetic and methylethylglycollic acids and the alkamine protoverine. It is therefore a triacyl ester of protoverine. 

Preparation of Alkaloid III 100 g of the alkaloid mixture was dissolved in a liter of benzene and the resulting mixture filtered. The filtrate was diluted with approximately 4 liters of an aliphatic hydrocarbon solvent (Skellysolve 81 and the resulting mixture filtered. The filtrate was cooled with Dry Ice to cause precipitation, and the alkaloid removed by filtration. There was thus obtained an alkaloid, which, for convenience, is called Alkaloid III, having analytical values consistent with a molecular formula C32H4,05N, apparently an ester of a tertiary alkamine. 

Arnebia euchroma Forssk. Zi Cao (root) Shikonin, acetylshikonin, beta-beta-dimethylacrytoylshikonin, beta-OH-isovalerylshikonin, alkamin-B, beta-di-Me-acrylate.33-450 Anti-inflammatory, antiseptic, antibacterial, toothache, eye diseases, ahealerof cuts, bums, and wounds. 

Acylations, Alkylations, Reductive Alkylations (Aminations, Alkaminations)... 

Isohypognavine has been isolated (99, 106) from the roots of A. majijai Nakai and A. japonicum Thumb. Its name is unfortunate since it is not an isomer of hypognavine. This alkaloid has not been isolated from any other Aconitum species. On alkaline hydrolysis, isohypognavine gave an alkamine known as isohypognavinol. On the basis of chemical correlation (107) of isohypognavine with kobusine, the partial structures 108 and 109 were... 

KIRs... IgSF alkamines pMHC class la -10 activation or... 

Two important synthetic products containing similar alkamine ester groupings are stovaine and alypine. 

In novocaine it will be seen that there is present the same alkamine ester grouping which is characteristic of cocaine. The compound is prepared by the following reactions. 

XXX) by reduction to XXXII and subsequent acetobromolysis, and this product was converted into the ( —)-diol XXXI, identical with the alkamine of natural valeroidine (III). Inversely, partial methylation 39b) of that diol gave the methiodide (XXXIII) of (— )-6(8-methoxy-tropine so that no breaking of the C-6—0 bond occurred during demethy-lation hence, the methoxyl and hydroxyl groups are both The degradation by nitric acid of the (+ )-2,4-dioximino-3-tropanone (39 a,b) furnished 25% of [Pg.280]

Figure 20-2 The incorrect structures proposed for cocaine (a) and tropine (b) by Albert Einhorn and Georg Merling. Structures of methyltrlacetone alkamine (c). alpha-Eucaine (d). and beta-Eucaine (e).

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