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Valmiki M, Teo SP, de Resende PE, Gibbons S, Ganesan A. Caudiquinol: A Meroterpenoid with an Intact C20 Geranylgeranyl Chain Isolated from Garcinia caudiculata. Molecules 2024; 29:3613. [PMID: 39125018 PMCID: PMC11314301 DOI: 10.3390/molecules29153613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2024] [Revised: 07/29/2024] [Accepted: 07/29/2024] [Indexed: 08/12/2024] Open
Abstract
The tropical Garcinia genus of flowering plants is a prolific producer of aromatic natural products including polyphenols, flavonoids, and xanthones. In this study, we report the first phytochemical investigation of Garcinia caudiculata Ridl. from the island of Borneo. Fractionation, purification, and structure elucidation by MS and NMR resulted in the discovery of two meroterpenoids. One was a benzofuranone lactone previously isolated from Iryanthera grandis and Rhus chinensis, and the second was a new hydroquinone methyl ester that we named caudiquinol. Both natural products are rare examples of plant meroterpenoids with an intact geranylgeranyl chain.
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Affiliation(s)
- Maya Valmiki
- School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK;
| | - Stephen Ping Teo
- Forest Department Sarawak Headquarters, Medan Raya, Petra Jaya, Kuching 93050, Sarawak, Malaysia;
| | | | - Simon Gibbons
- Natural and Medical Sciences Research Center, University of Nizwa, PC 616, Birkat Al-Mauz, Nizwa P.O. Box 33, Oman;
| | - A. Ganesan
- School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK;
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Pan W, Li C, Zhu H, Li F, Li T, Zhao W. A mild and practical method for deprotection of aryl methyl/benzyl/allyl ethers with HPPh 2 and tBuOK. Org Biomol Chem 2021; 19:7633-7640. [PMID: 34524311 DOI: 10.1039/d1ob01286j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general method for the demethylation, debenzylation, and deallylation of aryl ethers using HPPh2 and tBuOK is reported. The reaction features mild and metal-free reaction conditions, broad substrate scope, good functional group compatibility, and high chemical selectivity towards aryl ethers over aliphatic structures. Notably, this approach is competent to selectively deprotect the allyl or benzyl group, making it a general and practical method in organic synthesis.
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Affiliation(s)
- Wenjing Pan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China.
| | - Chenchen Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China.
| | - Haoyin Zhu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China.
| | - Fangfang Li
- The Department of Dermatology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.
| | - Tao Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China.
| | - Wanxiang Zhao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, Hunan 410082, China.
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3
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Hu S, Lu Z, Liu M, Xu H, Wu J, Chen F. TfOH-Catalyzed Cascade C-H Activation/Lactonization of Phenols with α-Aryl-α-diazoesters: Rapid Access to α-Aryl Benzofuranones. J Org Chem 2020; 85:14916-14925. [PMID: 32957783 DOI: 10.1021/acs.joc.0c01583] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Aryl benzofuranones are privileged structural units present in natural products and pharmaceutically relevant compounds with high bioactivity and therapeutic value; synthetic access to these scaffolds remains an area of intensive interest. A new and efficient TfOH-catalyzed cascade ortho C-H activation/lactonization of phenols with α-aryl-α-diazoacetates is reported. This metal-free protocol provides an operationally simple and rapid method for the one-pot assembly of diverse α-aryl benzofuranones in high yields with broad substrate scope, a readily starting material, good chemo-regioselectivity, and excellent functional group compatibility.
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Affiliation(s)
- Sha Hu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Zuolin Lu
- Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou 310014, China
| | - Minjie Liu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Hanlin Xu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Jiale Wu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Fener Chen
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China.,Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou 310014, China
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