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Isolation of Guttiferones from Renewable Parts of Symphonia globulifera by Centrifugal Partition Chromatography
被引:5
作者:

Cottet, Kevin
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Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France

Fromentin, Yann
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Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France

Kritsanida, Marina
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Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France

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Odonne, Guillaume
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CNRS Guyane, USR 3456, Cayenne, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France

Duplais, Christophe
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Inst Pasteur Guyane, Lab Subst Nat Amazoniennes, UMR EcoFoG Ecol Forets Guyane, Cayenne, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France

Michel, Sylvie
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机构:
Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France

Lallemand, Marie-Christine
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Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France
机构:
[1] Univ Paris 05, Sorbonne Paris Cite, Lab Pharmacognosie, UMR CNRS COMETE Chim Organ Med Extract Toxicol &, F-75006 Paris, France
[2] CNRS Guyane, USR 3456, Cayenne, France
[3] Inst Pasteur Guyane, Lab Subst Nat Amazoniennes, UMR EcoFoG Ecol Forets Guyane, Cayenne, France
关键词:
Symphonia globulifera;
Clusiaceae;
centrifugal partition chromatography;
countercurrent chromatography guttiferones;
PPAPs;
POLYCYCLIC POLYPRENYLATED ACYLPHLOROGLUCINOLS;
NATURAL-PRODUCTS;
BENZOPHENONE DERIVATIVES;
DRUG-RESISTANCE;
LEISHMANIASIS;
D O I:
10.1055/s-0035-1557773
中图分类号:
Q94 [植物学];
学科分类号:
071001 ;
摘要:
The aim of this study was to investigate the species Symphonia globulifera, a source of polycyclic polyprenylated acyl phloroglucinols such as guttiferone A, which is known to exhibit a variety of biological activities including noticeable antileishmanial properties. Our goal was the identification and the quantification of guttiferone A in different renewable parts of S. globulifera and its preparative isolation. To the best of our knowledge, there is no data concerning its mechanism of action. Consequently, it is particularly interesting to isolate it in gram quantities in order to establish structure activity relationship studies. After performing high-performance liquid chromatography profiles detecting the presence of guttifer-one A and proceeding to its quantification, a centrifugal partition chromatography methodology using a two-phase solvent system of cyclohexane/ethyl acetate/methanol/water (20 : 1 : 20: 1, v/v/v/v) was applied to each extract. In conclusion, a centrifugal partition chromatography system has been developed to ensure a fast, reliable, and scalable way to isolate, with a high level of purity, guttiferone A from five renewable parts of S. globulifera. Moreover, this methodology can be extended to the isolation of other polycyclic polyprenylated acyl phloroglucinols such as guttiferones B, C, and D.
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页码:1604 / 1608
页数:5
相关论文
共 15 条
[1]
Polycyclic polyprenylated acylphloroglucinols
[J].
Ciochina, Roxana
;
Grossman, Robert B.
.
CHEMICAL REVIEWS,
2006, 106 (09)
:3963-3986

Ciochina, Roxana
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Kentucky, Dept Chem, Lexington, KY 40506 USA Univ Kentucky, Dept Chem, Lexington, KY 40506 USA

Grossman, Robert B.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Kentucky, Dept Chem, Lexington, KY 40506 USA Univ Kentucky, Dept Chem, Lexington, KY 40506 USA
[2]
Drug resistance in leishmaniasis
[J].
Croft, SL
;
Sundar, S
;
Fairlamb, AH
.
CLINICAL MICROBIOLOGY REVIEWS,
2006, 19 (01)
:111-+

Croft, SL
论文数: 0 引用数: 0
h-index: 0
机构: Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Dis, London WC1E 7HT, England

论文数: 引用数:
h-index:
机构:

Fairlamb, AH
论文数: 0 引用数: 0
h-index: 0
机构: Univ London London Sch Hyg & Trop Med, Dept Infect & Trop Dis, London WC1E 7HT, England
[3]
Synthesis of novel guttiferone A derivatives: In-vitro evaluation toward Plasmodium falciparum, Trypanosoma brucei and Leishmania donovani
[J].
Fromentin, Yann
;
Gaboriaud-Kolar, Nicolas
;
Lenta, Bruno Ndjakou
;
Wansi, Jean Duplex
;
Buisson, Didier
;
Mouray, Elisabeth
;
Grellier, Philippe
;
Loiseau, Philippe M.
;
Lallemand, Marie-Christine
;
Michel, Sylvie
.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY,
2013, 65
:284-294

Fromentin, Yann
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Gaboriaud-Kolar, Nicolas
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Lenta, Bruno Ndjakou
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

论文数: 引用数:
h-index:
机构:

Buisson, Didier
论文数: 0 引用数: 0
h-index: 0
机构:
Museum Natl Hist Nat, CNRS, UMR 7245, Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Mouray, Elisabeth
论文数: 0 引用数: 0
h-index: 0
机构:
Museum Natl Hist Nat, CNRS, UMR 7245, Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Grellier, Philippe
论文数: 0 引用数: 0
h-index: 0
机构:
Museum Natl Hist Nat, CNRS, UMR 7245, Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Loiseau, Philippe M.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Paris 11, Fac Pharm, CNRS, BioCIS UMR 8076, F-92290 Chatenay Malabry, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Lallemand, Marie-Christine
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France

Michel, Sylvie
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France Univ Paris 05, Sorbonne Paris Cite, UMR CNRS 8638, Lab Pharmacognosie, F-75006 Paris, France
[4]
Yeast-Mediated Xanthone Synthesis through Oxidative Intramolecular Cyclization
[J].
Fromentin, Yann
;
Grellier, Philippe
;
Wansi, Jean Duplex
;
Lallemand, Marie-Christine
;
Buisson, Didier
.
ORGANIC LETTERS,
2012, 14 (19)
:5054-5057

Fromentin, Yann
论文数: 0 引用数: 0
h-index: 0
机构:
MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France
Univ Paris Descartes Sorbonne Paris Cite, CNRS, UMR 8638, Lab Pharmacognosie,Fac Pharm, F-75006 Paris, France MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France

Grellier, Philippe
论文数: 0 引用数: 0
h-index: 0
机构:
MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France

论文数: 引用数:
h-index:
机构:

Lallemand, Marie-Christine
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Paris Descartes Sorbonne Paris Cite, CNRS, UMR 8638, Lab Pharmacognosie,Fac Pharm, F-75006 Paris, France MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France

Buisson, Didier
论文数: 0 引用数: 0
h-index: 0
机构:
MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France MNHN, CNRS, UMR 7245, Unite Mol Commun & Adaptat Microorganismes, F-75005 Paris, France
[5]
HIV INHIBITORY NATURAL-PRODUCTS .8. THE GUTTIFERONES, HIV-INHIBITORY BENZOPHENONES FROM SYMPHONIA-GLOBULIFERA, GARCINIA-LIVINGSTONEI GARCINIA-OVALIFOLIA AND CLUSIA-ROSEA
[J].
GUSTAFSON, KR
;
BLUNT, JW
;
MUNRO, MHG
;
FULLER, RW
;
MCKEE, TC
;
CARDELLINA, JH
;
MCMAHON, JB
;
CRAGG, GM
;
BOYD, MR
.
TETRAHEDRON,
1992, 48 (46)
:10093-10102

GUSTAFSON, KR
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

BLUNT, JW
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

MUNRO, MHG
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

FULLER, RW
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

MCKEE, TC
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

CARDELLINA, JH
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

MCMAHON, JB
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

CRAGG, GM
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702

BOYD, MR
论文数: 0 引用数: 0
h-index: 0
机构: NCI,FREDERICK CANC RES & DEV CTR,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,FREDERICK,MD 21702
[6]
Large scale extraction of the fruits of Garcinia indica for the isolation of new and known polyisoprenylated benzophenone derivatives
[J].
Kaur, Ranjeet
;
Chattopadhyay, Sunil K.
;
Tandon, Sudeep
;
Sharma, Shelly
.
INDUSTRIAL CROPS AND PRODUCTS,
2012, 37 (01)
:420-426

Kaur, Ranjeet
论文数: 0 引用数: 0
h-index: 0
机构:
CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India

Chattopadhyay, Sunil K.
论文数: 0 引用数: 0
h-index: 0
机构:
CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India

Tandon, Sudeep
论文数: 0 引用数: 0
h-index: 0
机构:
CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India

Sharma, Shelly
论文数: 0 引用数: 0
h-index: 0
机构:
CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India CSIR, Cent Inst Med & Aromat Plants, Lucknow 226015, Uttar Pradesh, India
[7]
Leishmanicidal and cholinesterase inhibiting activities of phenolic compounds from Allanblackia monticola and Symphonia globulifera
[J].
Lenta, Bruno Ndjakou
;
Vonthron-Senecheau, Catherine
;
Weniger, Bernard
;
Devkota, Krishna Prasad
;
Ngoupayo, Joseph
;
Kaiser, Marcel
;
Naz, Qamar
;
Choudhary, Muhammad Iqbal
;
Tsamo, Etienne
;
Sewald, Norbert
.
MOLECULES,
2007, 12 (08)
:1548-1557

Lenta, Bruno Ndjakou
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Vonthron-Senecheau, Catherine
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Weniger, Bernard
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Devkota, Krishna Prasad
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Ngoupayo, Joseph
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Kaiser, Marcel
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Naz, Qamar
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Choudhary, Muhammad Iqbal
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Tsamo, Etienne
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon

Sewald, Norbert
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Higher Teachers Training Coll, Dept Chem, Yaounde, Cameroon
[8]
Antiplasmodial benzophenone derivatives from the root barks of Symphonia globulifera (Clusiaceae)
[J].
Marti, Guillaume
;
Eparvier, Veronique
;
Moretti, Christian
;
Prado, Soizic
;
Grellier, Philippe
;
Hue, Nathalie
;
Thoison, Odile
;
Delpech, Bernard
;
Gueritte, Francoise
;
Litaudon, Marc
.
PHYTOCHEMISTRY,
2010, 71 (8-9)
:964-974

Marti, Guillaume
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Eparvier, Veronique
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, UPS 2561, F-97300 Cayenne, Guyane Francais, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Moretti, Christian
论文数: 0 引用数: 0
h-index: 0
机构:
IRD, Unite 84, IRD Biodival, F-45072 Orleans 2, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Prado, Soizic
论文数: 0 引用数: 0
h-index: 0
机构:
Museum Natl Hist Nat, CNRS, FRE 3206, F-75231 Paris 05, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Grellier, Philippe
论文数: 0 引用数: 0
h-index: 0
机构:
Museum Natl Hist Nat, CNRS, FRE 3206, F-75231 Paris 05, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Hue, Nathalie
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Thoison, Odile
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Delpech, Bernard
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Gueritte, Francoise
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France

Litaudon, Marc
论文数: 0 引用数: 0
h-index: 0
机构:
CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France CNRS, Inst Chim Subst Nat, Ctr Rech Gif, F-91198 Gif Sur Yvette, France
[9]
Anti-plasmodial and antioxidant activities of constituents of the seed shells of Symphonia globulifera Linn f.
[J].
Ngouela, S
;
Lenta, BN
;
Noungoue, DT
;
Ngoupayo, J
;
Boyom, FF
;
Tsamo, E
;
Gut, J
;
Rosenthal, PJ
;
Connolly, JD
.
PHYTOCHEMISTRY,
2006, 67 (03)
:302-306

Ngouela, S
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Lenta, BN
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Noungoue, DT
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Ngoupayo, J
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Boyom, FF
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Tsamo, E
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Gut, J
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Rosenthal, PJ
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon

Connolly, JD
论文数: 0 引用数: 0
h-index: 0
机构: Univ Yaounde I, Fac Sci, Dept Organ Chem, Yaounde, Cameroon
[10]
Synthetic efforts toward [3.3.1] bridged bicyclic phloroglucinol natural products
[J].
Njardarson, Jon T.
.
TETRAHEDRON,
2011, 67 (40)
:7631-7666

Njardarson, Jon T.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Arizona, Dept Chem & Biochem, Tucson, AZ 85716 USA Univ Arizona, Dept Chem & Biochem, Tucson, AZ 85716 USA