Browsing by Author "A.H. Shah"
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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 A cyclopeptide alkaloid from the bark of Zizyphus rugosa(1988) V.B. Pandey; Y.C. Tripathi; S. Devi; J.-P. Singh; A.H. ShahRugosanine-A has been isolated from the stem bark of Zizyphus rugosa. The structure was deduced by spectroscopic methods and chemical degradation. © 1988.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 Chemical constituents of Rhamnus procumbens and pharmacological actions of emodin(1988) S.P.D. Dwivedi; V.B. Pandey; A.H. Shah; Y.B. RaoMusizin, physcon, emodin and frangulin‐A have been isolated from the whole plant of Rhamnus procumbens and their structures established by a detailed study of spectral data and also by degradation methods. Pharmacological investigations on emodin have indicated that it possesses intestinal and cardiac stimulant, CNS depressant and analgesic activities. Such activities have not earlier been reported for emodin. This is also the first report of the isolation of these chemical constituents in Rhamnus procumbensf and the second natural occurrence of musizin. Copyright © 1988 John Wiley & Sons, Ltd.PublicationArticle Chemical constituents of the bark of Zizyphus trinervia(1982) V.B. Pandey; J.P. Singh; A.H. Shah[No abstract available]PublicationArticle Chemical constituents of the flowers of Clerodendron infortunatum(1980) N.K. Sinha; V.B. Pandey; A.H. Shah; B. Dasgupta[No abstract available]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 Cyclopeptide alkaloids from zizyphus xylopyra(1986) V.B. Pandey; S. Devi; J.P. Singh; A.H. ShahIn our continuing search (1–7) for cyclopeptide alkaloids from Ziziyphus species, we report here the isolation and characterization of the cyclopeptide alkaloids mauritine-D and nummularine-B from the bark of Zizyphus xylopyra Willd. These alkaloids have not previously been reported from this source. © 1986, American Chemical Society. All rights reserved.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 Nummularine-s: A cyclopeptide alkaloid from stem bark of Zizyphus nummularia(1989) A.H. Shah; R.M.A. Khan; S.K. Maurya; V.P. SinghFrom the stem bark of Zizyphus nummularia a 13-membered cyclopeptide alkaloid containing a short side chain has been isolated. The structure was determined by spectroscopic methods and chemical degradation. Zizyphus nummularia seems to be closely related to Z. jujuba, Z. sativa and Z. amphibia. © 1989.PublicationArticle Peptide alkaloids from Zizyphus species(1987) S. Devi; V.B. Pandey; J.P. Singh; A.H. ShahThe isolation of cyclopeptide alkaloids, frangufoline from Zizyphus jujuba and Z. nummularia, amphibine-H and nummularine-K from Z. xylopyra and nummularine-R, a new 13-membered cyclopeptide alkaloid, from Z. nummularia is reported. The structure of the new alkaloid was elucidated by spectroscopic methods and by chemical degradation. © 1987.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.PublicationArticle Sativanine-k: An additional N-formyl cyclopeptide alkaloid from Zizyphus sativa(1987) A.H. Shah; M.A. Al-Yahya; S. Devi; V.B. PandeyFrom the bark of Zizyphus sativa a 13-membered N-formyl cyclopeptide alkaloid containing a short side chain has been isolated for the first time. The structure was determined by spectroscopic methods and chemical degradation. © 1987.PublicationArticle Triterpenoid saponins from the bark of Zizyphus joazeiro(1984) Ryuichi Higuchi; Satomi Kubota; Tetsuya Komori; Toshio Kawasaki; V.B. Pandey; J.P. Singh; A.H. ShahThree new triterpenoid saponins were isolated from the barks of Zizyphus joazeiro and characterized as jujubogenin 3-O-α-l-arabinofuranosyl-(1 → 2)-[β-d-glucopyranosyl(1 → 3)]-α-l-arabinopyranoside, its 4‴-O-sulphate and 3″,4‴-di-O-sulphate, respectively. FAB-MS was useful in providing information on the molecular weight of the complex oligoglycoside sulphates. © 1984.