Nauclefolinine: A new alkaloid from the roots of Nauclea latifolia

A novel indole alkaloid, nauclefolinine (1) and five known triterpenic compounds, rotundic acid (2), a-L-rhamnoquinovic acid (3), 3-O-b-D-glucopyranosyl-b-sitosterol (4), squalene (5) and sitosterol-3-O-6’-stearoyl-b-D-glucopyranoside (6) have been isolated from the roots of Nauclea latifolia. KEY WORDS: Nauclea latifolia, Rubiaceae, Indole alkaloid, Triterpenic acids, Rotundic acid, Rhamnoquinovic acid  Bull. Chem. Soc. Ethiop. 2003, 17(2), 173-176

4,5-Epoxide-1,6-dimethyl-1-vinylhexyl p-coumarate: A novel monoterpene derivative from Cleistopholis patens

A novel monoterpene derivative (1) and four known partially and total acetylated tri- and tetrarhamonoside dodecanyl ether derivatives: cleistrioside-2 (2) and cleistrioside-3 (3), cleistetroside-6 (4) and cleistetroside peracetate (5) have been isolated from the fruits of Cleistopholis patens. KEY WORDS: Cleistopholis patens, Annonaceae, Oligosaccharide, Partially acetylated tri- and tetrarhamnoside dodecanyl ether derivatives, Cleistrioside, Cleistetroside, Monoterpene derivative  Bull. Chem. Soc. Ethiop. 2003, 17(2), 177-180

Influence of Noise on Peak Integrals Obtained by Direct Summation

International audienceThe influence of zero-filling on the peak integral precision is examined when integration is carried out by direct summation of spectral point ordinates. A relationship that allows the computation of the standard deviation of the integrals is derived, taking into account the effects of apodization and noise intensity profile. Discrepancies between theory and experimentation arise from nonideal characteristics of noise

<b>Sapelenin E and F: new acyclic triterpenoids from the stem bark of <i>Entandrophragma cylindricum</i></b>

New acyclic triterpenoids, sapelenin E (1) and F (2) were isolated from the stem bark of Entandrophragma cylindricum. Their full structure including absolute configuration in sapelenin E (1) were determine from spectroscopic data and by chemical transformation

SAPELENIN E AND F: NEW ACYCLIC TRITERPENOIDS FROM THE STEM BARK OF ENTANDROPHRAGMA CYLINDRICUM

International audienc

Band-selective HSQC and HMBC experiments using excitation sculpting and PFGSE

International audienc

<b>Nauclefolinine: A new alkaloid from the roots of <i>Nauclea latifolia</i></b>

A novel indole alkaloid, nauclefolinine (1) and five known triterpenic compounds, rotundic acid (2), α-L-rhamnoquinovic acid (3), 3-O-β-D-glucopyranosyl-β-sitosterol (4), squalene (5) and sitosterol-3-O-6’-stearoyl-β-D-glucopyranoside (6) have been isolated from the roots of Nauclea latifolia

<b>4,5-Epoxide-1,6-dimethyl-1-vinylhexyl <i>p</i>-coumarate: A novel monoterpene derivative from <i>Cleistopholis patens</i></b>

A novel monoterpene derivative (<b>1</b>) and four known partially and total acetylated tri- and tetrarhamonoside dodecanyl ether derivatives: cleistrioside-2 (<b>2</b>) and cleistrioside-3 (<b>3</b>), cleistetroside-6 (<b>4</b>) and cleistetroside peracetate (<b>5</b>) have been isolated from the fruits of <i>Cleistopholis patens</i>

Alkaloids from leaves and stems of Vallesia glabra

D'une Apocynacée bolivienne, #Vallesia glabra$, 7 alcaloïdes indoliques ont été isolés des feuilles et des écorces de tiges. Les expériences de RMN 2D ont permis de compléter les données spectrales déjà publiées sur la vallessine et l'apidospermine. (Résumé d'auteur

Alkaloids from leaves and stems of Vallesia glabra

D'une Apocynacée bolivienne, #Vallesia glabra$, 7 alcaloïdes indoliques ont été isolés des feuilles et des écorces de tiges. Les expériences de RMN 2D ont permis de compléter les données spectrales déjà publiées sur la vallessine et l'apidospermine. (Résumé d'auteur