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Byatt BJ, Kato A, Pyne SG. Synthesis of the Purported Structure of Glyphaeaside C and Proposed Revisions to the Structures of the Glyphaeaside Alkaloids. JOURNAL OF NATURAL PRODUCTS 2023; 86:1261-1273. [PMID: 37125736 DOI: 10.1021/acs.jnatprod.3c00046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The 10 glyphaeaside alkaloids isolated from the roots of Glyphaea brevis were originally purported as piperidine-based 1-C-alkylated iminosugars, with the A-, B-, and C-type glyphaeasides bearing l-DFJ, DGJ, and DNJ ring configurations, respectively. Subsequent investigations have revealed glyphaeaside C as being a pyrrolidine-based iminosugar with a DMDP ring configuration via total synthesis of the revised structure. In this work, side chain diastereomers of the originally purported structure of glyphaeaside C (10) and two related α-1-C-alkylated DNJ derivatives were synthesized from a common precursor, which was prepared in turn via stereoselective Grignard addition to a protected d-glycosylamine, followed by a reductive amination-cyclization sequence. Glycosidase inhibitory activity studies revealed general structure 10 as having potent inhibition against various α-glucosidases and weak inhibition against almond β-glucosidase in agreement with similar DNJ-based iminosugars and in contrast to natural glyphaeaside C, suggesting that the (1,2-dihydroxy-3-phenyl)propyl moiety does not play a particularly vital role in the inhibitory modes of action of either compound. Furthermore, the absolute configuration of natural glyphaeaside C was proposed as that of d-DMDP, and the structures of the A- and B-type glyphaeasides were revised as 1-deoxy-DALDP and DALDP derivatives, respectively, based on interpretation of their reported NMR spectroscopic data.
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Affiliation(s)
- Brendan J Byatt
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Atsushi Kato
- Department of Hospital Pharmacy, University of Toyama, Sugitani, Toyama 2630, Japan
| | - Stephen G Pyne
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
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UHPLC–DAD–ESI–MS/MS characterization of St. John’s wort infusions from Serbia origin. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-021-01940-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Song J, He Y, Luo C, Feng B, Ran F, Xu H, Ci Z, Xu R, Han L, Zhang D. New progress in the pharmacology of protocatechuic acid: A compound ingested in daily foods and herbs frequently and heavily. Pharmacol Res 2020; 161:105109. [PMID: 32738494 DOI: 10.1016/j.phrs.2020.105109] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 07/21/2020] [Accepted: 07/21/2020] [Indexed: 12/13/2022]
Abstract
Protocatechuic acid is a natural phenolic acid, which widely exists in our daily diet and herbs. It is also one of the main metabolites of complex polyphenols, such as anthocyanins and proanthocyanins. In recent years, a large number of studies on the pharmacological activities of protocatechuic acid have emerged. Protocatechuic acid has a wide range of pharmacological activities including antioxidant, anti-inflammatory, neuroprotective, antibacterial, antiviral, anticancer, antiosteoporotic, analgesia, antiaging activties; protection from metabolic syndrome; and preservation of liver, kidneys, and reproductive functions. Pharmacokinetic studies showed that the absorption and elimination rate of protocatechuic acid are faster, with glucuronidation and sulfation being the major metabolic pathways. However, protocatechuic acid displays a dual-directional regulatory effect on some pharmacological activities. When the concentration is very high, it can inhibit cell proliferation and reduce survival rate. This review aims to comprehensively summarize the pharmacology, pharmacokinetics, and toxicity of protocatechuic acid with emphasis on its pharmacological activities discovered in recent 5 years, so as to provide more up-to-date and thorough information for the preclinical and clinical research of protocatechuic acid in the future. Moreover, it is hoped that the clinical application of protocatechuic acid can be broadened, giving full play to its characteristics of rich sources, low toxicity and wide pharmacological activites.
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Affiliation(s)
- Jiao Song
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Yanan He
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Chuanhong Luo
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Bi Feng
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Fei Ran
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Hong Xu
- Chengdu Yongkang Pharmaceutical Co., Ltd., Chengdu 610041, PR China
| | - Zhimin Ci
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Runchun Xu
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China
| | - Li Han
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China.
| | - Dingkun Zhang
- Pharmacy College, Chengdu University of Traditional Chinese Medicine, Key Laboratory Breeding Base of Systematic Research and Utilization on Chinese Meterial Medical Resources Co-founded by Sichuan Province and Ministry of Science and Technology, Chengdu 611137, PR China.
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