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Songjanthuek P, Saleepochn T, Pluempanupat W, Yongsmith B, Kongkathip B, Wattana-Amorn P. Combination of 1H and 13C NMR for quantitative analysis of the orange pigments produced by Monascus kaoliang KB9. Nat Prod Res 2023; 37:1406-1409. [PMID: 34933631 DOI: 10.1080/14786419.2021.2010197] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Two orange pigments, rubropunctatin (1) and monascorubrin (2), along with the yellow pigments, monascin (3) and ankaflavin (4), were isolated from M. kaoliang KB9-fermented rice, also known as red yeast rice. The orange pigments exhibit a broad spectrum of biological activities and appeared to be the major components of this fermented rice. In this work, quantitative 1H NMR (qHNMR) and 13C NMR experiments were used to determine the amounts of the two orange pigments in a crude extract in which most of the 1H NMR signals of the two compounds were indistinguishable. The quantitative values obtained by NMR techniques were found to be similar to those obtained by HPLC. Thus, the combined qHNMR with 13C experiment described in this work could be further developed to quantifying Monascus pigments or other invaluable natural products when qHNMR alone is insufficient for quantitative analysis.
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Affiliation(s)
- Pacharaphan Songjanthuek
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
- Special Research Unit for Advanced Magnetic Resonance and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Tharinee Saleepochn
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Wanchai Pluempanupat
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
- Special Research Unit for Advanced Magnetic Resonance and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Busaba Yongsmith
- Department of Microbiology and Center for Advanced Studies in Tropical Natural Resources (CASTNAR), National Research University-Kasetsart University (NRU-KU), Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Boonsong Kongkathip
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
- Special Research Unit for Advanced Magnetic Resonance and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Pakorn Wattana-Amorn
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
- Special Research Unit for Advanced Magnetic Resonance and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand
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Lamor A, Uipanit S, Chuanopparat N, Yakhampom S, Ngernmeesri P, Kongkathip N, Kongkathip B. Asymmetric Formal Synthesis of (–)-Swainsonine from Chiral-Pool Precursors d-Mannose and d-Arabinose. Synlett 2022. [DOI: 10.1055/s-0041-1737335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractCarbohydrates have played an important role in organic synthesis. Since they contain many stereocenters, they have been widely used as chiral-pool starting materials. Herein, we report the asymmetric formal synthesis of (–)-swainsonine, which exhibits anticancer and immunosuppressive activities and inhibits lysosomal α-mannosidase activity, from d-mannose and d-arabinose. The synthesis utilized Zn-mediated Bernet–Vasella reaction, Horner–Wadsworth–Emmons olefination, and Grubbs olefin metathesis as key reactions.
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Abstract
An effective method for synthesis of 16α-methyl cyproterone acetate was accomplished starting from commercially available 16-dehydropregnenolone acetate in eight steps, 11.5% overall yield.
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Affiliation(s)
- Uthai Sakee
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Boonsong Kongkathip
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Ngampong Kongkathip
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
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Grigg R, Elboray EE, Akkarasamiyo S, Chuanopparat N, Dondas HA, Abbas-Temirek HH, Fishwick CWG, Aly MF, Kongkathip B, Kongkathip N. A facile palladium catalysed 3-component cascade route to functionalised isoquinolinones and isoquinolines. Chem Commun (Camb) 2016; 52:164-6. [DOI: 10.1039/c5cc07526b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We present a novel and facile route to functionalised isoquinolinones and isoquinolines in good yields.
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Affiliation(s)
| | | | - Sunisa Akkarasamiyo
- School of Chemistry
- University of Leeds
- Leeds
- UK
- Natural Products and Organic Synthesis Research Unit (NPOS)
| | - Nutthawat Chuanopparat
- School of Chemistry
- University of Leeds
- Leeds
- UK
- Natural Products and Organic Synthesis Research Unit (NPOS)
| | - H. Ali Dondas
- Department of Chemistry
- Faculty of Pharmacy
- Mersin University
- Mersin
- Turkey
| | | | | | - Moustafa F. Aly
- Department of Chemistry
- Faculty of Science at Qena
- South Valley University
- Qena
- Egypt
| | - Boonsong Kongkathip
- Natural Products and Organic Synthesis Research Unit (NPOS)
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Kasetsart University
- Chatuchak
| | - Ngampong Kongkathip
- Natural Products and Organic Synthesis Research Unit (NPOS)
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Kasetsart University
- Chatuchak
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Kongkathip B, Kongkathip N, Rujirawanich J. New Strategy for Synthesis of the Disaccharide Moiety of the Highly Potent Anticancer Natural Product OSW-1. SYNTHETIC COMMUN 2014. [DOI: 10.1080/00397911.2014.891747] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Boonsong Kongkathip
- a Natural Products and Organic Synthesis Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science , Kasetsart University , Chatuchak , Bangkok , Thailand
| | - Ngampong Kongkathip
- a Natural Products and Organic Synthesis Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science , Kasetsart University , Chatuchak , Bangkok , Thailand
| | - Janjira Rujirawanich
- a Natural Products and Organic Synthesis Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science , Kasetsart University , Chatuchak , Bangkok , Thailand
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Kuntiyong P, Piboonsrinakara N, Bunrod P, Namborisut D, Akkarasamiyo S, Songthammawat P, Hemmara C, Buaphan A, Kongkathip B. Synthesis of Quinolizidinone and Indolizidinone Using N-Acyliminium Ion Cyclization and a One-Pot Procedure for Preparation of Benzoquinolizidinone. HETEROCYCLES 2014. [DOI: 10.3987/com-13-12917] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Grigg R, Akkarasamiyo S, Chuanopparat N, Elboray EE, Aly MF, Abbas-Temirek HH, Kongkathip B, Kongkathip N. Stereoselective Pd(0) catalysed five component cascade synthesis of complex Z,Z-bisallylamines. Chem Commun (Camb) 2013; 49:2007-9. [DOI: 10.1039/c3cc00067b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Chuanopparat N, Kongkathip N, Kongkathip B. A new and efficient asymmetric synthesis of oseltamivir phosphate (Tamiflu) from d-mannose. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.08.143] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pradidphol N, Kongkathip N, Sittikul P, Boonyalai N, Kongkathip B. First synthesis and anticancer activity of novel naphthoquinone amides. Eur J Med Chem 2012; 49:253-70. [DOI: 10.1016/j.ejmech.2012.01.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Revised: 01/09/2012] [Accepted: 01/10/2012] [Indexed: 11/28/2022]
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Kongkathip B, Hasakunpaisarn A, Boonananwong S, Kongkathip N. Synthesis of cytotoxic novel 9,11-secosterol analogs: Structure/activity studies. Steroids 2010; 75:834-47. [PMID: 20470813 DOI: 10.1016/j.steroids.2010.05.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Revised: 04/27/2010] [Accepted: 05/03/2010] [Indexed: 10/19/2022]
Abstract
In an effort to determine the pharmaceutical utility and the structural requirements for activity against tumor cell lines, 30 novel 9,11-secosterol analogues with different side chains and degrees of oxidation at C-9 were synthesized starting from hecogenin. Evaluation of the synthesized compounds for cytotoxicity against KB, HeLa and MCF-7 cell lines revealed that some important structural features are required for activity. The presence of a cholesterol-type side chain, which appears to play a major role in determining the biological activity, the existence of a ketone functional at C-9 is also crucial for anticancer activity whereas hydroxyl/ketone function at C-22 on the side chain did not increase cytotoxicity.
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Affiliation(s)
- Boonsong Kongkathip
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.
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Kongkathip B, Sutthiprabha S, Yoosook C, Mongkolsook Y, Kongkathip N. Determination of a Pyranocoumarin and Three Carbazole Compounds in Clausena excavata by RP-HPLC. J Chromatogr Sci 2010; 48:445-9. [DOI: 10.1093/chromsci/48.6.445] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Bunyathaworn P, Boonananwong S, Kongkathip B, Kongkathip N. Further study on synthesis and evaluation of 3,16,20-polyoxygenated steroids of marine origin and their analogs as potent cytotoxic agents. Steroids 2010; 75:432-44. [PMID: 20188119 DOI: 10.1016/j.steroids.2010.02.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2009] [Revised: 02/11/2010] [Accepted: 02/11/2010] [Indexed: 11/26/2022]
Abstract
A series of new polyoxygenated steroid derivatives with various steroid skeleton moieties were synthesized. Antitumor activity of the compounds against three tumor cell lines (Breast cancer MCF7, lung cancer NCI and oral cancer KB) were evaluated. Compounds with aromatic A ring of this series exhibited the most potent cytotoxicities in all tested cells. The absence of OH at C-16 or lack of cholesterol like side chain at C-20 in the steroid skeleton apparently result in decreased cytotoxicity. The compound became inactive when the side chain contains double bond at C-24-C-25. When hydroxyl group at C-3 was protected no cytotoxicities against MCF7 and NCI and considerable low cytotoxicity against KB cell lines were observed.
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Affiliation(s)
- Potjamarn Bunyathaworn
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Kasetsart University, 50 Phaholyotin Road, Chatuchak, Bangkok 10900, Thailand
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Wichienukul P, Akkarasamiyo S, Kongkathip N, Kongkathip B. An efficient synthesis of oseltamivir phosphate (Tamiflu) via a metal-mediated domino reaction and ring-closing metathesis. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.04.044] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kongkathip N, Pradidphol N, Hasitapan K, Grigg R, Kao WC, Hunte C, Fisher N, Warman AJ, Biagini GA, Kongsaeree P, Chuawong P, Kongkathip B. Transforming rhinacanthin analogues from potent anticancer agents into potent antimalarial agents. J Med Chem 2010; 53:1211-21. [PMID: 20067272 DOI: 10.1021/jm901545z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Twenty-six novel naphthoquinone aliphatic esters were synthesized by esterification of 1,4-naphthoquinone alcohols with various aliphatic acids. The 1,4-naphthoquinone alcohols were prepared from 1-hydroxy-2-naphthoic acid in nine steps with excellent yields. Twenty-four of the novel synthetic naphthoquinone esters showed significant antimalarial activity with IC(50) values in the range of 0.03-16.63 microM. The length of the aliphatic chain and the presence of C-2' substituents on the propyl chain affected the activity. Interestingly, compounds 31 and 37 showed very good antimalarial activity and were not toxic to normal Vero cells, and the PTI values of 31 (>1990.38) and 37 (1825.94) are excellent. Both 31 and 37 showed potent inhibition against P. falciparum 3D7 cyt bc(1) and no inhibition on rat cyt bc(1). They showed IC(50) values in the nanomolar range, providing full inhibition of cyt bc(1) with one molecule inhibitor bound per cyt bc(1) monomer at the Q(o) site.
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Affiliation(s)
- Ngampong Kongkathip
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Kasetsart University, Jatujak, Bangkok 10900, Thailand.
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Boonananwong S, Kongkathip B, Kongkathip N. First synthesis of 3,16,20-polyoxygenated cholestanes, new cytotoxic steroids from the gorgonian Leptogorgia sarmentosa. Steroids 2008; 73:1123-7. [PMID: 18550136 DOI: 10.1016/j.steroids.2008.04.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 04/17/2008] [Accepted: 04/21/2008] [Indexed: 11/19/2022]
Abstract
Using tigogenin as starting material, (20S)-20-hydroxycholestane-3,6-dione (1), (16S, 20S)-16,20-dihydroxycholestan-3-one (2), (20S)-20-hydroxycholest-1-ene-3,16-dione (3) and (20S)-20-hydroxycholest-4-ene-3,16-dione (4), natural polyoxygenated steroids from the gorgonian, Leptogorgia sarmentosa, were synthesized in four steps. Antitumor activity against three tumor cell lines (breast cancer, MCF7, lung cancer NCI and oral cancer KB) was evaluated. Two compounds (3 and 4) showed strong activity against NCI (IC(50) 6.16 and 10.51 microM) and moderate activity against MCF7 and KB, the IC(50) being in the range 30.65-47.22 microM. Compound 2 showed moderate activity against NCI (IC(50) 42.68 microM) but was inactive against MCF7 and KB whereas compound 1 showed no activity against all tested cells.
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Affiliation(s)
- Suthinee Boonananwong
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science, Kasetsart University, Chatuchak, Bangkok 10900, Thailand
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Ley S, Tzschucke C, Pradidphol N, Diéguez-Vázquez A, Kongkathip B, Kongkathip N. FeCl3-Catalysed Cleavage of 1,2-Butanediacetal Protected Diols. Synlett 2008. [DOI: 10.1055/s-2008-1072752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ploysuk C, Kongkathip B, Kongkathip N. Synthesis of Isagarin, a Tetracyclic Naphthoquinone via a Palladium‐Catalyzed Cyclization. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910701227432] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kongkathip N, Hasitapan K, Pradidphol N, Kirtikara K, Jongkona N, Kongkathip B. Synthesis of novel 2-(2'-cyclopentyl)- and 2-(2'-cyclohexyl) substituted 1-naphthol derivatives with anticyclooxygenase activity. Curr Med Chem 2006; 13:3663-74. [PMID: 17168729 DOI: 10.2174/092986706779026084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Eight novel 2-(2'-cyclopentyl)- and 2-(2'-cyclohexyl) substituted 1-naphthol derivatives were synthesized in good yield starting from 1-hydroxy-2-naphthoic acid. Two of them, 2-((1-(hydroxymethyl)cyclopentyl)methyl)naphthalene-1-ol (8) and 2-((1-(hydroxymethyl)cyclohexyl)methyl)-naphthalene-1-ol (9) showed anticyclooxygenase activity on COX-2 with IC(50) values of 19.90 microM and 7.77 microM, respectively and 9 also inhibited COX-1 (5.55 microM), while the other six were inactive on both isozymes. Molecular docking experiments indicated that the orientation of the active naphthols is different from that of the inactive ones. Two evidences playing important roles for the inhibition by the active compounds, are 1) C-1 and C-3' hydroxyl groups formed hydrogen bonds with COX-2/COX-1 Val523/Ile523 and Arg120, respectively, 2) hydrogen at C-5 of the naphthalene nucleus was attracted rather close to the phenolic group of Tyr385 due to van der Waals interaction.
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Affiliation(s)
- Ngampong Kongkathip
- Natural Products and Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
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Affiliation(s)
- Uthai Sakee
- a Department of Chemistry , Faculty of Science , Kasetsart University , Bangkok , Thailand
| | - Ngampong Kongkathip
- a Department of Chemistry , Faculty of Science , Kasetsart University , Bangkok , Thailand
| | - Boonsong Kongkathip
- a Department of Chemistry , Faculty of Science , Kasetsart University , Bangkok , Thailand
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Affiliation(s)
- Ngampong Kongkathip
- a Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science , Kasetsart University , Bangkok, Thailand
| | - Boonsong Kongkathip
- a Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science , Kasetsart University , Bangkok, Thailand
| | - Naratitt Noimai
- a Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science , Kasetsart University , Bangkok, Thailand
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Dondas HA, Fishwick CWG, Gai X, Grigg R, Kilner C, Dumrongchai N, Kongkathip B, Kongkathip N, Polysuk C, Sridharan V. Stereoselective Palladium-Catalyzed Four-Component Cascade Synthesis of Pyrrolidinyl-, Pyrazolidinyl-, and Isoxazolidinyl Isoquinolines. Angew Chem Int Ed Engl 2005; 44:7570-4. [PMID: 16247817 DOI: 10.1002/anie.200502066] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- H Ali Dondas
- Molecular Innovation, Diversity and Automated Synthesis Centre, School of Chemistry, Leeds University, Leeds, UK
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Dondas HA, Fishwick CWG, Gai X, Grigg R, Kilner C, Dumrongchai N, Kongkathip B, Kongkathip N, Polysuk C, Sridharan V. Stereoselective Palladium-Catalyzed Four-Component Cascade Synthesis of Pyrrolidinyl-, Pyrazolidinyl-, and Isoxazolidinyl Isoquinolines. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200502066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kongkathip B, Sangma C, Kirtikara K, Luangkamin S, Hasitapan K, Jongkon N, Hannongbua S, Kongkathip N. Inhibitory effects of 2-substituted-1-naphthol derivatives on cyclooxygenase I and II. Bioorg Med Chem 2005; 13:2167-75. [PMID: 15727869 DOI: 10.1016/j.bmc.2004.12.054] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2004] [Revised: 12/28/2004] [Accepted: 12/29/2004] [Indexed: 02/02/2023]
Abstract
Naphthol derivatives, 2-(3'-hydroxypropyl)-naphthalen-1-ol (2), 2-(3'-hydroxy-2'-methylpropyl)-naphthalen-1-ol (3) and 2-(3'-hydroxy-2',2'-dimethylpropyl)-naphthalen-1-ol (7) were synthesized and already reported by our group. Therefore in this paper we described further synthesis of their ether derivatives, 3-(1-methoxy-naphthalen-2-yl)-propan-1-ol (4), 3-(1-methoxy-naphthalen-2-yl)-2methyl-propan-1-ol (5), 3-(1-methoxy-naphthalen-2-yl)-2,2-dimethyl-propan-1-ol (8), 2-(3-methoxy-propyl)-naphthalen-1-ol (10) and 2-(3-methoxy-2,2-dimethyl-propyl)-naphthalen-1-ol (13). Compounds 4, 5 and 8 were prepared by methylation of compounds 2, 3 and 7, respectively while compounds 10 and 13 were prepared in good yield from naphthols 2 and 7, respectively. When tested for inhibitory activity, five compounds (2, 3, 7, 10 and 13) showed preferential inhibition of COX-2 over COX-1, while compounds 4, 5 and 8 lacked inhibitory effect on either the COX-1 or COX-2 isozyme. The structure-activity relationships of these naphthols analyzed by docking experiments, indicated that the presence of hydroxyl group at C-1 position on the naphthalene nucleus enhanced the anti-inflammatory activity towards COX-2 via hydrogen bonding to the COX-2 Val 523 side chain. When this hydroxyl group was replaced by methoxy group, there was no inhibition. C-2' Dimethyl substituents on the propyl chain also increased the inhibitory activity. All active compounds have the C-1 hydroxyl group aligned so as to form hydrogen bond with Val 523. The results provide a model for the binding of the naphthol derivatives to COX-2 and facilitate the design of more potent or selective analogs prior to synthesis.
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Affiliation(s)
- Boonsong Kongkathip
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
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Daly JW, Noimai N, Kongkathip B, Kongkathip N, Wilham JM, Garraffo HM, Kaneko T, Spande TF, Nimit Y, Nabhitabhata J, Chan-Ard T. Biologically active substances from amphibians: preliminary studies on anurans from twenty-one genera of Thailand. Toxicon 2005; 44:805-15. [PMID: 15530960 DOI: 10.1016/j.toxicon.2004.08.016] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2004] [Accepted: 08/30/2004] [Indexed: 11/18/2022]
Abstract
Amphibian skin has been the source of a wide variety of biologically active substances, but less than one-third of the known genera of amphibians have been probed for such active substances. Skins of 21 genera of anurans from Thailand have now been investigated for noxious secretions, toxic substances, and alkaloids. Four genera of bufonid toads (Bufo, Ansonia, Leptophryne, Pedostipes) were toxic due to the presence of bufadienolides or bufadienolide-like compounds. Two species of ranid frogs (Rana raniceps, Rana signata) were toxic, perhaps due to the presence of toxic peptide(s). Two species of rhacophorid frogs (Polypedates) were slightly noxious/toxic. One species of microhylid frog (Kaloula pulchra) was noxious. Trace amounts of pumiliotoxin alkaloids were detected in a ranid frog (Limnonectes kuhli). A further 18 species did not exhibit noxious or toxic properties to a significant extent.
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Affiliation(s)
- John W Daly
- Laboratory of Bioorganic Chemistry, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, DHHS, NIH, Bldg. 8, Rm. 1A17, Bethesda, MD 20892 USA.
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Kongkathip B, Kongkathip N, Sunthitikawinsakul A, Napaswat C, Yoosook C. Anti-HIV-1 constituents fromClausena excavata: Part II. carbazoles and a pyranocoumarin. Phytother Res 2005; 19:728-31. [PMID: 16177980 DOI: 10.1002/ptr.1738] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Three carbazole derivatives, O-methylmukonal (1), 3-formyl-2,7-dimethoxycarbazole (2) and clauszoline J (3), and a pyranocoumarin, clausenidin (4), were isolated from the rhizomes and roots of Clausena excavata. Compound 1, isolated from this plant for the first time, has not been reported previously as having anti-HIV-1 activity. Compounds 1-4 displayed anti-HIV-1 activity in a syncytial assay with EC(50) values of 12, 29.1, 34.2 and 5.3 microm, respectively, and thus exhibited potential therapeutic index (PTI) values of 56.7, 8.0, 1.6 and 7.0, respectively. All isolated compounds demonstrated a lack of cytotoxicity against the KB and BC-1 cancer cell lines.
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Affiliation(s)
- Boonsong Kongkathip
- The Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
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Chaosuancharoen N, Kongkathip N, Kongkathip B. A Novel Synthetic Approach from Diosgenin to a 17α‐Hydroxy Orthoester via a Regio‐ and Stereo‐Specific Rearrangement of an Epoxy Ester. SYNTHETIC COMMUN 2004. [DOI: 10.1081/scc-120028627] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kongkathip N, Luangkamin S, Kongkathip B, Sangma C, Grigg R, Kongsaeree P, Prabpai S, Pradidphol N, Piyaviriyagul S, Siripong P. Synthesis of Novel Rhinacanthins and Related Anticancer Naphthoquinone Esters. J Med Chem 2004; 47:4427-38. [PMID: 15317455 DOI: 10.1021/jm030323g] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Rhinacanthin-M, -N and -Q, natural products isolated from the medicinal plant Rhinacanthus nasutus, and 39 novel naphthoquinone esters have been synthesized in excellent yield by esterification of naphthoquinone-3-(propan-3'-ols) with benzoic or naphthoic acids. Almost all the naphthoquinone esters that contain a C-3 hydroxy group showed significant cytotoxicities against KB, HeLa, and HepG2 cell lines. In contrast, ester derivatives lacking the C-3 hydroxy group were inactive to the cancer cell lines. Two methyl substituents on the C-2' of propyl chain conferred more potent cytotoxicity than when there is only one or no methyl group. Naphthoate esters exhibited greater cytotoxicity than benzoate esters. Computer modeling has been done to obtain a first look at the mode of action in connection with these observations.
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Affiliation(s)
- Ngampong Kongkathip
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.
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Kongkathip N, Kongkathip B, Siripong P, Sangma C, Luangkamin S, Niyomdecha M, Pattanapa S, Piyaviriyagul S, Kongsaeree P. Potent antitumor activity of synthetic 1,2-Naphthoquinones and 1,4-Naphthoquinones. Bioorg Med Chem 2003; 11:3179-91. [PMID: 12818681 DOI: 10.1016/s0968-0896(03)00226-8] [Citation(s) in RCA: 178] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Rhinacanthone (1) and two 1,2-pyranonaphthoquinones (2,3) were synthesized and found to show very potent cytotoxicity against three cancer cell lines (KB, HeLa and HepG(2)) with IC(50) values of 0.92-9.63 microM, whereas the corresponding hydroxylated derivative 4 had reduced cytotoxicity (IC(50) values of 7.61-24.13 microM). Three 1,2-furanonaphthoquinone derivatives (5-7) were also synthesized with similar cytotoxicity as 1,2-pyranonaphthoquinones. In comparison to 1,2-naphthoquinones, six 1,4-naphthoquinones derivatives fused with pyran ring (8-10) and furan ring (11-13) were synthesized and they showed less cytotoxicity or inactive to the cancer cell lines. Moreover, compound 13 had significant cytotoxicity against HeLa cell line (IC(50) value of 9.25 microM) while it showed no toxic to vero cell.
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Affiliation(s)
- Ngampong Kongkathip
- Natural Products and Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.
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Sunthitikawinsakul A, Kongkathip N, Kongkathip B, Phonnakhu S, Daly JW, Spande TF, Nimit Y, Rochanaruangrai S. Coumarins and carbazoles from Clausena excavata exhibited antimycobacterial and antifungal activities. Planta Med 2003; 69:155-157. [PMID: 12624822 DOI: 10.1055/s-2003-37716] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Four known coumarins, dentatin (1), nor-dentatin (2), clausenidin (3) and xanthoxyletin (5), and six known carbazole derivatives, 3-formylcarbazole (6), mukonal (7), 3-methoxycarbonylcarbazole (8), murrayanine (9), 2-hydroxy-3-formyl-7-methoxycarbazole (10) and clauszoline J (11) were isolated from Clausena excavata. Compounds 1 and 6 were first isolated from the crude chloroform extract of the rhizomes. Compounds 1, 2, 3, 6, 7, 8, 10 and 11 showed antimycobacterial activity at a minimum inhibitory concentration (MIC) of 50, 100, 200, 100, 200, 50, 100 and 100 microg/mL, respectively. O-Methylated clausenidin ( 4), prepared from 3, exhibited antimycobacterial activity at MIC 50 microg/mL. Compounds 6, 7, 8 and 10 showed antifungal activity with IC 50 values of 13.6, 29.3, 9.5 and 2.8 microg/mL, respectively. All compounds demonstrated no cytotoxicity against KB and BC-1 cell lines.
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Sunthitikawinsakul A, Kongkathip N, Kongkathip B, Phonnakhu S, Daly JW, Spande TF, Nimit Y, Napaswat C, Kasisit J, Yoosook C. Anti-HIV-1 limonoid: first isolation fromClausena excavata. Phytother Res 2003; 17:1101-3. [PMID: 14595596 DOI: 10.1002/ptr.1381] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A limonoid, clausenolide-1-ethyl ether (1) and two coumarins, dentatin (2) and nor-dentatin (3), were isolated from Clausena excavata. Limonoid 1 was obtained from the crude ethanol extract of the rhizomes and the roots but had not previously been isolated from C. excavata and exhibited HIV-1 inhibitory activity. Coumarins 2 and 3, with their structures related to an anti-HIV-1 substance, (+)-calanolide A (4), were obtained from the crude chloroform extract of the rhizomes. Both induced toxicity to cells used in a syncytium assay for anti-HIV-1 activity. These compounds, 1-3, did not show any cytotoxic effect against KB and BC-1 cell lines (IC(50) value > 20 microgram/mL).
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Affiliation(s)
- Arunrat Sunthitikawinsakul
- Natural Products and Organic Synthesis Research Unit (NPOS), Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
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Kongkathip N, Dhumma-upakorn P, Kongkathip B, Chawananoraset K, Sangchomkaeo P, Hatthakitpanichakul S. Study on cardiac contractility of cycloeucalenol and cycloeucalenone isolated from Tinospora crispa. J Ethnopharmacol 2002; 83:95-99. [PMID: 12413712 DOI: 10.1016/s0378-8741(02)00210-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This report describes the isolation of two triterpenes from the stems of Tinospora crispa, namely, cycloeucalenol (1). and cycloeucalenone (2). for the first time. It was found that cycloeucalenol (1). slightly increased the right atrial force of contraction whereas it showed an initial reduction followed by sustained reduction of about 10% on the left atria of the rat in vitro. Cycloeucalenone showed slight change from the control on the right and left atrial force. These results suggest that cycloeucalenol and cycloeucalenone produced mild cardiotonic effects.
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Affiliation(s)
- Ngampong Kongkathip
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, Thailand.
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Grigg R, Kongkathip N, Kongkathip B, Luangkamin S, Dondas H. Corrigendum to “Palladium catalysed reactions of allene with active methylene pronucleophiles. C-1,3-Dienylmethyl derivatives and their Diels–Alder reactions”. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(01)01137-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Grigg R, Kongkathip N, Kongkathip B, Luangkamin S, Dondas H. Palladium catalysed reaction of allene with phenols. Phenoxymethyl-1,3-dienes and their further reactions. Tetrahedron 2001. [DOI: 10.1016/s0040-4020(01)00771-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Kongkathip B, Sookkho R, Kongkathip N, Taylor WC. Syntheses of Both Diastereoisomers of 2,8-Dioxabicyclo[3.2.1]octane Derivatives: Degradation Products of Daphniphyllum Alkaloids. CHEM LETT 1999. [DOI: 10.1246/cl.1999.1095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kongkathip B, Kongkathip N, Khunnavutimanotum P, Sakee U. Simple and Convenient Method for the Synthesis of Δ9(11)-3-Hydroxy, Δ1,4- and Δ1,4,9(11)-3-Ketosteroids by Selective Dehydrogenation of 3-Hydroxy-12-Ketosteroids. CHEM LETT 1998. [DOI: 10.1246/cl.1998.1207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Byrom NT, Grigg R, Kongkathip B, Reimer G, Wade AR. Palladium-catalysed synthesis of endo- and exo-brevicomin and related di- and tri-oxabicyclo[x.2.1] systems. ACTA ACUST UNITED AC 1984. [DOI: 10.1039/p19840001643] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Byrom NT, Grigg R, Kongkathip B. Catalytic synthesis of endo-brevicomin and related di- and tri-oxabicyclo[x.2.1] systems. ACTA ACUST UNITED AC 1976. [DOI: 10.1039/c39760000216] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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