Lignans from Ocotea foetens

López, Hernán; Valera, A.; Trujillo, Juan Pedro Pérez

doi:10.1021/np50119a023

Cited by 23 publications

(11 citation statements)

References 13 publications

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“…The seed extract of M. virginiana yielded magnolol and honokiol, which were separated as described above. The seed extract of M. acuminata yielded the two lignans galgravin and veraguensin which were described previously (Lopez et al, 1995) whereas seeds of M. macrophylla did not show any lignan content. The purity of all compounds was veryfied by both 1 H-and 13 C-NMR and HPLC.…”

Section: Extraction and Isolationsupporting

confidence: 66%

Neolignans from North American Magnolia Species with Cyclooxygenase 2 Inhibitory Activity

Schühly

Khan²,

Fischer

2009

Inflammopharmacol

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Section: Extraction and Isolationsupporting

confidence: 66%

Neolignans from North American Magnolia Species with Cyclooxygenase 2 Inhibitory Activity

Schühly

Khan²,

Fischer

2009

Inflammopharmacol

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“…The relative configurations of C-3, -4, and -5 were presumed as S, S, and S, respectively, which was confirmed from the NOESY cross signals (Table 1) between H-2 and H-3, between H-3 and H-4, between H-4 and H-5, and between -NHand H-3 and by the coupling constants for those cis-protons (J < 7.2 Hz) at tetrahydrofuran (for trans-protons, J > 7.2 Hz) (26,27). The relative configuration of C-2′ was determined to be R by comparing the chemical shift and coupling constants of H-2′ with previously reported data (28)(29)(30).…”

Section: Resultsmentioning

confidence: 54%

Novel ceramides and a new glucoceramide from the roots of Incarvillea arguta

Luo

et al. 2004

Lipids

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Novel ceramides, rel-(3S,4S,5S)-3-[(2R)-2-hydroxy- (2) were isolated from the aqueous ethanolic extract of the roots of Incarvillea arguta, together with eight known compounds: β-sitosterol (3), oleanolic acid (4), ursolic acid (5), piperin (6), maslinic acid (7), β-sitosterol 6′-O-acyl-β-D-glucopyranoside (8), 8-epideoxyloganic acid (9), and plantarenaloside (10). Their structures were elucidated on the basis of spectral data including IR, MS, NMR [ 1 H NMR, 13 C NMR (distortionless enhancement by polarization transfer), 1 H-1 H COSY, heteronuclear multiplequantum coherence, and heteronuclear multiple-bond coherence correlations]. The relative configurations were established by nuclear Overhauser effect spectroscopy experiments and by comparison of the NMR spectral data and coupling constants with those already reported in the literature.

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“…the coupling constants ( 3 J 3,4 and 3 J 4,5 ) for those cis-protons 286 (J b 7.2 Hz) at tetrahydrofuran (for trans-protons, J N 7.2 Hz) 287[21,22], and the biosynthesis pathway of phytosphingosine 288 from D-glutamic acid[23]. The absolute configuration of C-2″ 289 was determined to be R by comparing the chemical shift and290 coupling constants of H-2″ with those reported in the literature 291 [23-26].…”

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confidence: 99%