Browsing by Author "G. Eckhardt"
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PublicationArticle A 13-membered cyclopeptide alkaloid from Zizyphus sativa(1985) A.H. Shah; V.B. Pandey; G. Eckhardt; R. TschescheFrom the bark of Zizyphus sativa a new type of 13-membered cyclopeptide alkaloid, sativanine-D (1) has been isolated. Its structure was proved mainly by mass spectrometry and chemical degradation. © 1985.PublicationArticle An N-formyl cyclopeptide alkaloid from the bark of zizyphus sativa(1985) A.H. Shah; V.B. Pandey; G. Eckhardt; R. TschescheFrom the bark of Zizyphus sativa, previously undescribed cyclopeptide alkaloid, sativanine-F has been isolated. The structure was deduced by spectroscopic methods and chemical degradation. It is a 13-membered cyclopeptide alkaloid and provides the first example of such a naturally occurring N-formyl cyclopeptide alkaloid. © 1985.PublicationArticle Cyclopeptide alkaloids from Zizyphus nummularia(1984) V.B. Pandey; J.P. Singh; K.K. Seth; A.H. Shah; G. EckhardtIn addition to the known alkaloid nummularine-B, two new peptide alkaloids nummularine-M and nummularine-N have been isolated from Zizyphus nummularia and their structures elucidated. Nummularine-M is a 14-membered cyclopeptide and belongs to the integerrinine type, whereas nummularine-N is a 13-membered cyclopeptide like nummularine-B. © 1984.PublicationArticle Cyclopeptide alkaloids from zizyphus nummularia(1987) S.P.D. Dwivedi; V.B. Pandey; A.H. Shah; G. Eckhardt[No abstract available]PublicationArticle Nummularine-O, a cyclopeptide alkaloid from Zizyphus nummularia(1986) V.B. Pandey; S.P.D. Dwivedi; A.H. Shah; G. EckhardtIn addition to the known peptide alkaloid jubanine-B, a new peptide alkaloid, nummularine-O, has been isolated from the stem bark of Zizyphus nummularia and their structures have been elucidated by chemical and spectroscopic methods. © 1986.PublicationArticle Sativanine-C: A cyclopeptide alkaloid from the bark of Zizyphus sativa(1984) A.H. Shah; V.B. Pandey; G. Eckhardt; R. TschescheFrom the bark of Zizyphus sativa a previously undescribed 13 membered cyclopeptide alkaloid, sativanine-C has been isolated. The structure of this new compound was elucidated by spectroscopic methods, its transformation product and by chemical degradation. © 1984.PublicationArticle Sativanine-e, a new 13-membered cyclopeptide alkaloid containing a short side-chain, from zizyphus sat1va1(1985) A.H. Shah; V.B. Pandey; G. Eckhardt; R. TschescheA new 13-membered cyclopeptide alkaloid, sativanine-E (1), carrying a short side chain, has been isolated from Zizyphus sativa (Rhamnaceae). The structure was obtained by spectral evidence and hydrolysis. © 1985, American Chemical Society. All rights reserved.PublicationArticle Sativanine-g, a cyclopeptide alkaloid from Zizyphus sativa(1984) A.H. Shah; V.B. Pandey; J.P. Singh; K.N. Singh; G. EckhardtIn addition to the already described peptide alkaloids from the bark of Zizyphus sativa, a new compound of this class, sativanine-G, has been isolated and its structure elucidated. This alkaloid contains a 13-membered ring system and belongs to the nummularine-C class. © 1984.