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Jeon H, Kim JH, Kim S. Recent asymmetric synthesis of natural products bearing an α-tertiary amine moiety via temporary chirality induction strategies. Nat Prod Rep 2024; 41:228-250. [PMID: 37846620 DOI: 10.1039/d3np00032j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Covering: 2013 to 2023The α-tertiary amine moiety is a common structural motif in natural alkaloids and is frequently associated with intriguing biological activities and inherent synthetic challenges. A major hurdle in the total synthesis of these alkaloids is the asymmetric construction of the α-tertiary amine moiety. Temporary chirality inductions have been effective strategies employed to address this issue, particularly in natural product synthesis. The temporary chirality induction strategies in α-tertiary amine synthesis can be broadly classified into three categories based on the types of temporary chirality involved: Seebach's self-regeneration of stereocenters (SRS), C-to-N-to-C chirality transfer, and memory of chirality (MOC). This review highlights the recent advancements in temporary chirality induction strategies for the total synthesis of α-tertiary amine-containing natural products between 2013 and 2023.
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Affiliation(s)
- Hongjun Jeon
- Therapeutics & Biotechnology Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
| | - Jae Hyun Kim
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea.
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Park GM, Kong SJ, Park JH, Kang JE, An SH, Kim HS, Kim IS, Boggu PR, Jung YH. Synthesis and evaluation of ent-Conduramine C-1 derivatives as α-glucosidase inhibitors via CSI-mediated amination reaction. Carbohydr Res 2023; 524:108746. [PMID: 36682231 DOI: 10.1016/j.carres.2023.108746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/12/2023] [Accepted: 01/16/2023] [Indexed: 01/19/2023]
Abstract
Concise synthesis of ent-conduramine C-1 and its derivatives has been achieved by using commercially available d-ribose. The key steps in the synthesis are regioselective and diastereoselective amination of polybenzyl ethers by chlorosulfonyl isocyanate (CSI), chelation-controlled carbonyl addition, and intramolecular olefin metathesis. All of the synthesized compounds were evaluated for inhibitory activity against α-glucosidase. The derivatives 18 (IC50 = 0.65 ± 0.03 mM) and 19 (IC50 = 0.26 ± 0.01 mM) were identified to be more potent than well-known α-glucosidase inhibitor acarbose (IC50 = 1.05 ± 0.17 mM) as a positive control.
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Affiliation(s)
- Gi Min Park
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Sun Ju Kong
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Jae Hyeon Park
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Ji Eun Kang
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Sung Hwan An
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Hyung Sik Kim
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - In Su Kim
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Pulla Reddy Boggu
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea.
| | - Young Hoon Jung
- School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Republic of Korea.
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Saito S, Suzuki S, Arai MA. Noaoxazole, a new heat shock metabolite produced by thermotolerant Streptomyces sp. HR41. J Antibiot (Tokyo) 2022; 75:509-513. [PMID: 35918479 DOI: 10.1038/s41429-022-00551-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/05/2022] [Accepted: 07/21/2022] [Indexed: 11/09/2022]
Abstract
The thermotolerant strain Streptomyces sp. HR41 was found to produce compound 1 only in a 45 °C culture, and not at the standard temperature. We previously designated this type of compound as a "heat shock metabolite" (HSM). NMR and MS analytical techniques were used to determine that the chemical structure of 1 comprised a methylated-oxazole ring and a linear chain moiety modified with a terminal amide group. Thus, 1 was shown to be a new curromycin analog, which we have designated noaoxazole (1). Compound 1 weakly activated Notch signal reporter activity without exhibiting cytotoxicity against assay cells at the same concentration.
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Affiliation(s)
- Shun Saito
- Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.
| | - Shiina Suzuki
- Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan
| | - Midori A Arai
- Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, 223-8522, Japan.
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