1H and 13C NMR assignments for two new cordiaquinones from roots of Cordia leucocephala

From the roots of Cordia leucocephala (Boraginaceae), two new meroterpenoid naphthoquinones, 6‐[10‐(12,12‐dimethyl‐13α‐hydroxy‐16‐methenyl‐cyclohexyl)ethyl]‐1,4‐naphthalenedione (cordiaquinone L) and 5‐methyl‐6‐[10‐(12,12‐dimethyl‐13β‐hydroxy‐16‐methenyl‐cyclohexyl)methyl‐1,4‐naphthalenedione (cordi...

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Published in:Magnetic resonance in chemistry 2009-02, Vol.47 (2), p.190-193
Main Authors: Diniz, Jaécio Carlos, Viana, Francisco Arnaldo, Oliveira, Odaci Fernandes, Maciel, Maria Aparecida M., Torres, Maria da Conceição de Menezes, Braz-Filho, Raimundo, Silveira, Edilberto R., Pessoa, Otília Deusdênia L.
Format: Article
Language:English
Subjects:
13C NMR
1H NMR
2D NMR
Boraginaceae
Carbon Isotopes
Cordia - chemistry
Cordia leucocephala
Magnetic Resonance Spectroscopy
naphthoquinones
Naphthoquinones - chemistry
Plant Roots - chemistry
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Summary:From the roots of Cordia leucocephala (Boraginaceae), two new meroterpenoid naphthoquinones, 6‐[10‐(12,12‐dimethyl‐13α‐hydroxy‐16‐methenyl‐cyclohexyl)ethyl]‐1,4‐naphthalenedione (cordiaquinone L) and 5‐methyl‐6‐[10‐(12,12‐dimethyl‐13β‐hydroxy‐16‐methenyl‐cyclohexyl)methyl‐1,4‐naphthalenedione (cordiaquinone M) were isolated. Their structures were elucidated after detailed 1D and 2D NMR (COSY, HSQC, HMBC and NOESY) data analyses and comparison with literature data for analogous compounds. Copyright © 2008 John Wiley & Sons, Ltd. From the roots of Cordia leucocephala (Boraginaceae), two new meroterpenoid naphthoquinones, 6‐[10‐(12,12‐dimethyl‐13α‐hydroxy‐16‐methenyl‐cyclohexyl)ethyl]‐1,4‐naphthalenedione (cordiaquinone L) and 5‐methyl‐6‐[10‐(12,12‐dimethyl‐13β‐hydroxy‐16‐methenyl‐cyclohexyl)meth‐yl‐1,4‐naphthalenedione (cordiaquinone M) were isolated. Their structures were elucidated after detailed 1D and 2D NMR data analyses and comparison with literature data for analogous compounds.
ISSN:0749-1581
1097-458X
DOI:10.1002/mrc.2373