Nitraria schoberi

Nitraramine and A-hydroxynitraramine were isolated from Nitraria schoberi (194,195). There are active hydrogen absorption bands in the IR spectrum of nitraramine at 3280 and 3530 cm- and a low intensity band at 1660 cm" (double bond). Acetylation of nitraramine (171) gave A-acetyl and A,0-diacetyl derivatives. Hydrogenation over Adams catalyst in acetic acid gave di-hydronitraramine (172) and dihydrodesoxynitraramine (173) (Scheme 30). The presence of peaks typical for quinolizidine alkaloids in the mass spectra of 171-... 

The conversion of lupanine into camoensidine may represent a biosynthetic pathway, and cleavage of the C-16 C-17 bond of a tetracyclic quinolizidine [cf. mamanine (3)] followed by carbon-carbon cyclization could lead to tetracyclic derivatives containing terminal piperidine rings. New alkaloids of this type have been obtained recently. Aloperine was first isolated from Sophora alopercuroides over forty years ago, and structure (12) has now been assigned to the alkaloid on the basis of spectral studies. Allylaloperine (13) is a constituent of the same species. Nitraramine (14) and 7V-hydroxynitraramine (15) from Nitraria schoberi are... 

A group of alkaloids having a novel structure has been isolated from Nitraria schoberi. The structure of nitrarine (22) was determined by X-ray crystal structure analysis of its dihydrochloride.Nitramidine (23) is a didehydro-derivative, and can be obtained from nitrarine by mercuric acetate oxidation, and schoberidine (24) is... 

Two pentacyclic bases containing tryptamine units and a second nitrogen have been reported. The structure (18) for nitrarine, an optically inactive base from Nitraria schoberi, relies at the moment on spectral measurements. Elaeocarpidine, an optically inactive alkaloid which co-occurs with indolizidine alkaloids in Elaeocarpus densijiorus, has been examined fully and proved to have the structure (19). Central to the structure determination was a hydro-genolysis, in acid solution, of the N-C-N system to give dihydroelaeocarpidine... 

CioHijNO, Mr 169.27 (+)-form a piperidine alkaloid from Nitraria schoberi (Zygophyllaceae), oil, [alo -h16.5° (CHCI3) (-)-Af-methyl-N. sibirine (C11H21NO, Mr 183.29), from Nitraria sibirica, oil, [a]g -22.5°(CHCl3). 

Deoxyvasicinone II Adhotoda vasica (Acanthaceae) [15], Tsatis indigotica (Brassicaceae) [32], I. tinctoria [90], Nitraria schoberi (Zygophyllaceae) [35], Peganum harmala (Zygophyllaceae) [17], P. multisectum [32]... 

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