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Uemura K, Murakami R, Kimura E, Kai M, Misuda N, Yasuda S, Miyashita H, Yoshimitsu H, Tsuchihasi R, Okawa M, Kinjo J, Ono M. Identification and characterization of organic and glycosidic acids in the crude resin glycoside fraction of Ipomoea lacunosa seeds. Carbohydr Res 2024; 536:109048. [PMID: 38310808 DOI: 10.1016/j.carres.2024.109048] [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: 12/17/2023] [Revised: 01/29/2024] [Accepted: 01/29/2024] [Indexed: 02/06/2024]
Abstract
Resin glycosides are commonly found in plants belonging to the Convolvulaceae family. Ipomoea lacunosa L. (Convolvulaceae) is an herbaceous vine native to the United States. The resin glycosides of this plant have not been studied in detail. In this study, the components of the crude resin glycoside fraction extracted from the seeds of I. lacunosa are characterized. Alkaline hydrolysis of the crude resin glycoside fraction obtained from methanolic extract of the seeds yielded three organic acids, namely, 2S-methylbutyric, (E)-2-methylbut-2-enoic, and 2R-methyl-3R-hydroxybutyric acids, and a glycosidic acid fraction. Acidic hydrolysis of the glycosidic acid fraction yielded hydroxyl fatty acid components, including 7S-hydroxydecanoic, 11S-hydroxytetradecanoic, 11S-hydroxyhexadecanoic, 3S,11S-dihydroxytetradecanoic, 3S,11S-dihydroxyhexadecanoic, and 3S,12S-dihydroxyhexadecanoic acids, as well as monosaccharide components, including d-glucose, d-quinovose, d-fucose, and l-rhamnose. Trimethylsilyldiazomethane-hexane treatment of the glycosidic acid fraction further yielded eleven previously undescribed glycosidic acid methyl esters and two known glycosidic acid methyl esters. The structures of the obtained compounds were characterized using various spectral techniques. Four of the undescribed compounds were hexaglycosides, five were heptaglycosides, and two were octaglycosides. The aglycone of these compounds was either methyl 11S-hydroxytetradecanoate, methyl 3S,11S-dihydroxytetradecanoate, or methyl 3S,11S-dihydroxyhexadecanoate. Among the undescribed compounds identified, eight contained novel glycans, and three were rare bisdesmosides with sugar linkages at the C-3 and C-11 positions of methyl 3S,11S-dihydroxytetradecanoate.
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Affiliation(s)
- Kazutaka Uemura
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan
| | - Renjyu Murakami
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan
| | - Eiki Kimura
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan
| | - Marina Kai
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan
| | - Nodoka Misuda
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan
| | - Shin Yasuda
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan
| | - Hiroyuki Miyashita
- Faculty of Pharmaceutical Sciences, Sojo University, 4-22-2 Ikeda, Nishi-ku, Kumamoto, 860-0082, Japan
| | - Hitoshi Yoshimitsu
- Faculty of Pharmaceutical Sciences, Sojo University, 4-22-2 Ikeda, Nishi-ku, Kumamoto, 860-0082, Japan
| | - Ryota Tsuchihasi
- Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Masafumi Okawa
- Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Junei Kinjo
- Faculty of Pharmaceutical Sciences, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Masateru Ono
- School of Agriculture, Tokai University, 871-12 Sugido, Mashiki-Cho, Kamimashiki-Gun, Kumamoto, 861-2205, Japan.
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Lee S, Rhee YH. Total Synthesis of the Purported Structure of Branched Resin Glycosides Merremoside G and H 2. Org Lett 2024; 26:602-606. [PMID: 38206072 DOI: 10.1021/acs.orglett.3c03808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
The first total synthesis of the purported structure of branched resin glycosides merremoside G and H2 is accomplished. A signature step is represented by the sequential transition-metal-catalyzed coupling of stable trisaccharide homoallylic alcohol and monosaccharide alkoxyallene to afford the pentasaccharide skeleton. This de novo strategy is conducted under mild conditions with no need of preactivation. In addition, it allows for efficient preparation of the target compounds in combination with late-stage functionalization.
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Affiliation(s)
- Sukhyun Lee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-Ro 77, Nam-Gu, Pohang, Kyeongbuk 37673, Republic of Korea
| | - Young Ho Rhee
- Department of Chemistry, Pohang University of Science and Technology, Cheongam-Ro 77, Nam-Gu, Pohang, Kyeongbuk 37673, Republic of Korea
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Resin Glycosides from Convolvulaceae Family: An Update. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27238161. [PMID: 36500257 PMCID: PMC9817078 DOI: 10.3390/molecules27238161] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/13/2022] [Accepted: 11/15/2022] [Indexed: 11/25/2022]
Abstract
Resin glycoside is a type of secondary metabolite isolated commonly from the Convolvulaceae family. It consists of oligosaccharides conjugated to organic acids with a larger percentage having a macrocyclic structure. The resin glycosides reported in this review is classified mostly based on the number of sugar units constructing the structure, which is correlated to the biological properties of the compounds. According to preliminary reviews, the protocols to isolate the compounds are not straightforward and require a special technique. Additionally, the structural determination of the isolated compounds needs to minimize the structure for the elucidation to become easier. Even though resin glycosides have a complicated structural skeleton, several total syntheses of the compounds have been reported in articles published from 2010 to date. This review is an update on the prior studies of the resin glycosides reported in 2010 and 2017. The review includes the classification, isolation techniques, structural determination, biological properties, and total synthesis of the resin glycosides.
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Wang W, Li Y, He Y, Jiang X, Yi Y, Zhang X, Zhang S, Chen G, Yang M, Luo JL, Fan B. Progress in the total synthesis of resin glycosides. Front Chem 2022; 10:1036954. [DOI: 10.3389/fchem.2022.1036954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 10/31/2022] [Indexed: 11/13/2022] Open
Abstract
Resin glycosides, mainly distributed in plants of the family Convolvulaceae, are a class of novel and complex glycolipids. Their structural complexity and significant biological activities have received much attention from synthetic chemists, and a number of interesting resin glycosides have been synthesized. The synthesized resin glycosides and their analogues not only helped in structural verification, structural modification, and further biological activity exploration but also provided enlightenment for the synthesis of glycoside compounds. Herein, the present review summarizes the application of various efforts toward the synthesis of resin glycosides in the last decade.
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