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2.
Magn Reson Chem ; 43(1): 92-6, 2005 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-15505818

RESUMO

7-Deoxyloganic acid (1), citrusin C (2), 3,4-dihydroxyl benzoic acid (3) and (E)-caffeic acid (4) were isolated from the water-soluble fraction of ethanol extracts of Morina nepalensis var. alba Hand.-Mazz. and their structures were determined on the basis of spectroscopic evidence. The total assignments of 1H and 13C NMR spectra of 1 in solvents CD3OD, D2O and CDCl3 were reported, in addition to the single-crystal X-ray diffraction analysis of its tetraacetate 1a. All compounds were obtained from Morina genus for the first time.


Assuntos
Iridoides/química , Espectroscopia de Ressonância Magnética/métodos , Modelos Moleculares , Conformação Molecular , Difração de Raios X/métodos
3.
J Asian Nat Prod Res ; 6(3): 205-9, 2004 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-15224418

RESUMO

Two new tirucallane-type triterpenoid saponins, sapimukoside C (1) and sapimukoside D (2), have been isolated from the roots of Sapindus mukorossi Gaetn. Their structures have been determined, on the basis of spectral and chemical analysis, as 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L- arabinopyranosyl-(1-->3)]-beta-D-glucopyranosyl (21,23R)-epoxyl tirucalla-7,24-diene-(21S)-ethoxyl-3 beta-ol (1) and 3-O-alpha-L-rhamnopyranosyl-(1-->2)-[alpha-L-arabinopyranosyl-(1-->3)]- beta-D-glucopyranosyl (21,23R)-epoxyl tirucall-7,24-diene-(21S)-methoxyl-3 beta-ol (2).


Assuntos
Fitoterapia , Extratos Vegetais/química , Sapindus , Saponinas/química , Triterpenos/química , Humanos , Espectroscopia de Ressonância Magnética , Raízes de Plantas
4.
J Asian Nat Prod Res ; 5(2): 75-82, 2003 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12765190

RESUMO

Four new oleanane type saponins, monepalosides G-J (1-4), were isolated from the water-soluble part of the whole plant of Morina nepalensis var. alba Hand-Mazz. On the basis of chemical and spectroscopic evidence, their structures were determined as 3-O-alpha-L-arabinopyranosyl-(1 --> 3)-alpha-L-arabinopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranoside (monepaloside G, 1), 3-O-alpha-L-arabinopyranosyl-(1 --> 3)-beta-D-xylopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranoside (monepaloside H, 2), 3-O-alpha-L-arabinopyranosyl-(1 --> 3)-[beta-D-glucopyranosyl-(1 --> 2)]-alpha-L-arabinopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranoside (monepaloside I, 3), 3-O-beta-D-glucopyranosyl-(1 --> 4)-beta-D-glucopyranosyl-(1 --> 3)]-alpha-L-arabinopyranosyl oleanolic acid 28-O-beta-D-glucopyranosyl-(1 --> 6)-beta-D-glucopyranoside (monepaloside J, 4), respectively. Two-dimensional NMR spectra, including H-H COSY, HMQC, 2D HMQC-TOCSY, HMBC and ROESY were utilized in the structure elucidation and complete assignments of 1H and 13C NMR spectra.


Assuntos
Magnoliopsida/química , Saponinas/isolamento & purificação , Triterpenos/isolamento & purificação , China , Medicamentos de Ervas Chinesas/química , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Extratos Vegetais , Saponinas/química , Espectrometria de Massas de Bombardeamento Rápido de Átomos , Triterpenos/química
5.
J Nat Prod ; 65(5): 750-2, 2002 May.
Artigo em Inglês | MEDLINE | ID: mdl-12027759

RESUMO

Five novel alkaloids, brachystemidines A-E (1-5), were isolated from the roots of Brachystemma calycinum. Their structures were established by spectral data, especially by 1D and 2D NMR techniques. The crystal structure of brachystemidine D was determined via X-ray diffraction analysis.


Assuntos
Alcaloides/isolamento & purificação , Caryophyllaceae/química , Medicamentos de Ervas Chinesas/química , Plantas Medicinais/química , Alcaloides/química , Cristalografia por Raios X , Conformação Molecular , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Raízes de Plantas/química
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