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Liang X, Ding QH, Yang JT, Yang HF, Deng Y, Shi L, Wei K, Yang YR. Total syntheses of the parvistemoline alkaloids enabled by stereocontrolled Ir/Pd-catalyzed allylic alkylation. Nat Commun 2024; 15:10812. [PMID: 39737970 DOI: 10.1038/s41467-024-55111-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2024] [Accepted: 12/02/2024] [Indexed: 01/01/2025] Open
Abstract
The functionalized polycycle with densely contiguous tertiary stereocenters is a formidable challenge in synthesizing the parvistemoline family of Stemona alkaloids. We herein report their catalytic, asymmetric total syntheses in 13-14 steps from commercially available 2-(methoxycarbonyl)-pyrrole, featuring the development and deployment of an Ir/Pd-synergistically-catalyzed allylation of α-non-substituted keto esters with secondary aryl-substituted alcohols, stereodivergently accessible to four stereoisomers. Using chiral Pd-enolate and Ir π-allyl complex under neutral conditions, no epimerization occurs. Additionally, the other two adjacent stereogenic centers can be installed diastereoselectively by Zn(BH4)2-promoted reduction and Krische's Ir-catalyzed 2-(alkoxycarbonyl)allylation. Oxy-Michael addition delivered the fused tetrahydrofuran-γ-lactone scaffold. At the later stage, hydrogenation or oxidation of pyrrole moiety furnished groups of tetrahydropyrrole and pyrrolidone. Finally, vinylogous Mannich reaction of an in situ generated iminium ion or Krische's Ir-catalyzed 2-(alkoxycarbonyl)allylation of aldehyde installed the monocyclic lactone for parvistemonine (2) and didehydroparvistemonine (3), respectively.
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Affiliation(s)
- Xiao Liang
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Qian-Hui Ding
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jian-Ting Yang
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hua-Fei Yang
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yi Deng
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Li Shi
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Kun Wei
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Yu-Rong Yang
- Key Laboratory of Phytochemistry and Natural Medicines, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China.
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2
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Angelis YS, Sakellariou P, Petrou M, Pitsinos EN. Targeted Metabolic Investigation of Ligandrol and Analytical Methods Validation for Its Main Long-term Metabolite. Chempluschem 2024; 89:e202300634. [PMID: 38183391 DOI: 10.1002/cplu.202300634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 12/18/2023] [Accepted: 01/05/2024] [Indexed: 01/08/2024]
Abstract
Prompted by the need for related analytical reference material in the frame of the fight against doping in sports, synthetic efforts towards the main long-term bishydroxylated metabolite (LGD-LTM1) of the nonsteroidal selective androgen receptor modulator (SARM) ligandrol have produced related derivatives that were exploited for a targeted metabolite analysis of urine samples obtained in the course of previous excretion studies of this SARM. Further clarifying ligandrol's metabolic profile, the availability of synthetic reference material permitted the structural elucidation of a previously reported pyrrolidinone-type metabolite and revealed its potential analytical utility as an additional long-term marker. Moreover, synthetic reference material enabled the comparison and validation of liquid chromatography coupled with mass spectrometry (LC-MS)-based and gas chromatography coupled with mass spectrometry (GC-MS)-based detection and identification methods focusing on the LGD-LTM1 marker.
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Affiliation(s)
- Yiannis S Angelis
- Institute of Biosciences & Applications, National Centre for Scientific Research "DEMOKRITOS", Doping Control Laboratory of Athens, Neratziotissis & Amaryssias Artemidos Str, GR 151 23, Athens, Greece
| | - Panagiotis Sakellariou
- Institute of Biosciences & Applications, National Centre for Scientific Research "DEMOKRITOS", Doping Control Laboratory of Athens, Neratziotissis & Amaryssias Artemidos Str, GR 151 23, Athens, Greece
| | - Michael Petrou
- Cyprus Anti-Doping Authority, Makarion Athletic Centre Avenue, Engomi, CY 2400, Nicosia, Cyprus
| | - Emmanuel N Pitsinos
- Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research "DEMOKRITOS", P.O. Box 60037, Aghia Paraskevi, GR 153 10, Athens, Greece
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3
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Wang X, Yin G, Wang Y, Zeng Y, Peng Y, Zhang X, Peng X, Wang Z. Asymmetric Total Synthesis of Four Stemona Alkaloids. Org Lett 2023; 25:2213-2217. [PMID: 36966439 DOI: 10.1021/acs.orglett.3c00349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2023]
Abstract
Asymmetric total syntheses of four Stemona alkaloids were accomplished, and among them, bisdehydrostemoninine A and stemoninine A were synthesized for the first time. Notably, these four alkaloids were divergently synthesized from a common tetracyclic intermediate, which was easily obtained from a known compound. Friedel-Crafts acylation was employed to introduce the key side chain at position C3 of Stemona alkaloids.
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Affiliation(s)
- Xiaodong Wang
- School of Pharmacy, Lanzhou University, No. 199 West Donggang Road, Lanzhou 730000, Gansu, China
| | - Gaofeng Yin
- School of Pharmacy, Lanzhou University, No. 199 West Donggang Road, Lanzhou 730000, Gansu, China
| | - Yuqing Wang
- School of Pharmacy, Lanzhou University, No. 199 West Donggang Road, Lanzhou 730000, Gansu, China
| | - Yaofu Zeng
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Ying Peng
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Xi Zhang
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Xue Peng
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
| | - Zhen Wang
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, Hunan, China
- School of Pharmacy, Lanzhou University, No. 199 West Donggang Road, Lanzhou 730000, Gansu, China
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4
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Lin Y, Zhang R, Wang D, Cernak T. Computer-aided key step generation in alkaloid total synthesis. Science 2023; 379:453-457. [PMID: 36730413 DOI: 10.1126/science.ade8459] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Efficient chemical synthesis is critical to satisfying future demands for medicines, materials, and agrochemicals. Retrosynthetic analysis of modestly complex molecules has been automated over the course of decades, but the combinatorial explosion of route possibilities has challenged computer hardware and software until only recently. Here, we explore a computational strategy that merges computer-aided synthesis planning with molecular graph editing to minimize the number of synthetic steps required to produce alkaloids. Our study culminated in an enantioselective three-step synthesis of (-)-stemoamide by leveraging high-impact key steps, which could be identified in computer-generated retrosynthesis plans using graph edit distances.
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Affiliation(s)
- Yingfu Lin
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Rui Zhang
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Di Wang
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
| | - Tim Cernak
- Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.,Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
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5
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Olivier WJ, Henneveld JS, Smith JA, Hawkins BC, Bissember AC. Strategies for the synthesis of Stemona alkaloids: an update. Nat Prod Rep 2022; 39:2308-2335. [PMID: 36218078 DOI: 10.1039/d2np00058j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Covering: 2009 to 2022The Stemona alkaloids, which are found in plant species from the family Stemonaceae, represent a tremendously large and structurally-diverse family of natural products. This review presents and discusses a selection of case studies, grouped by alkaloid class, that showcase the key strategies and overall progress that has been made in the synthesis of Stemona alkaloids and related compounds since 2009. Structural reassignments that have been reported over this period are also identified where necessary.
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Affiliation(s)
- Wesley J Olivier
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia.
| | - Jackson S Henneveld
- Department of Chemistry, University of Otago, Dunedin, Otago 9054, New Zealand.
| | - Jason A Smith
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia.
| | - Bill C Hawkins
- Department of Chemistry, University of Otago, Dunedin, Otago 9054, New Zealand.
| | - Alex C Bissember
- School of Natural Sciences - Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia.
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6
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Jiang JM, Shi ZH, Yang XW, Zhu D, Zhao BJ, Gao Y, Xia D, Yin ZQ, Pan K. Structural Revision of the Stemona Alkaloids Tuberostemonine O, Dehydrocroomines A and B, and Dehydrocroomine. JOURNAL OF NATURAL PRODUCTS 2022; 85:2110-2115. [PMID: 35969376 DOI: 10.1021/acs.jnatprod.2c00332] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The structural revision of four Stemona alkaloids from Stemona tuberosa is reported. The misassignment of the tuberostemonine O structure (1) was recognized when a new alkaloid, tuberostemonine P, was isolated and unambiguously assigned structure 1 in this work. Reinvestigation of the spectroscopic data and NMR calculations led to the revised structure 1a for tuberostemonine O. The structural misassignment of dehydrocroomine A as 2 was corrected by reinterpreting the X-ray crystal structure, which was consistent with 2a. The structural reassignments of dehydrocroomine B (3 to 3a) and dehydrocroomine (4 to 4a) were confirmed by X-ray crystallography and NMR calculations, respectively.
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Affiliation(s)
- Jia-Meng Jiang
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Ze-Hui Shi
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Xue-Wen Yang
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Dan Zhu
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Bao-Jun Zhao
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Yue Gao
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Dan Xia
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Zhi-Qi Yin
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
| | - Ke Pan
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing 211198, People's Republic of China
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7
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Olivier WJ, Smith JA, Bissember AC. Structural Revision of Parvistemoamide: Informing Biosynthetic Proposals of Stemona Alkaloids. Org Lett 2022; 24:5772-5776. [PMID: 35901193 DOI: 10.1021/acs.orglett.2c02254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The natural product parvistemoamide was isolated in 1991 and has ostensibly eluded synthesis. Its distinctive assigned structure represents the first and only Stemona alkaloid within its class. For over 30 years, this structure has influenced biosynthetic proposals concerning this family of natural products. Following synthetic studies and comprehensive analysis of relevant literature, a revised structure of parvistemoamide is proposed that is consistent with the fundamental Stemona alkaloid stemoamide.
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Affiliation(s)
- Wesley J Olivier
- School of Natural Sciences (Chemistry), University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Jason A Smith
- School of Natural Sciences (Chemistry), University of Tasmania, Hobart, Tasmania 7001, Australia
| | - Alex C Bissember
- School of Natural Sciences (Chemistry), University of Tasmania, Hobart, Tasmania 7001, Australia
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8
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Rosso GB, Paz BM, Pilli RA. Formal Syntheses of (±)‐Tuberostemospiroline and (±)‐Stemo‐lactam R and Total Synthesis of (±)‐Stemoamide. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Giovanni Bernardi Rosso
- State University of Campinas: Universidade Estadual de Campinas Chemistry Cidade Universitaria Zeferino Vaz 1308-970 Campinas BRAZIL
| | - Bruno Matos Paz
- State University of Campinas: Universidade Estadual de Campinas Chemistry Cidade Universitaria Zeferino Vaz 13083-970 Campinas BRAZIL
| | - Ronaldo Aloise Pilli
- UNICAMP Institute of Chemistry Organic Chemistry DepartmentPO BOX 6154 13083-970 Campinas, SP BRAZIL
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9
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Takahashi K, Kudo S, Kawamura K, Kusakabe T, Kikkawa S, Azumaya I, Kato K. Synthesis of the Proposed Structure of Mohangic Acid C. Org Lett 2022; 24:3416-3420. [DOI: 10.1021/acs.orglett.2c01285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Keisuke Takahashi
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Shunya Kudo
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Kiharu Kawamura
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Taichi Kusakabe
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Shoko Kikkawa
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Isao Azumaya
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Keisuke Kato
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
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10
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Sugiyama Y, Soda Y, Yoritate M, Tajima H, Takahashi Y, Shibuya K, Ogihara C, Yokoyama T, Oishi T, Sato T, Chida N. Lactam Strategy Using Amide-Selective Nucleophilic Addition for the Quick Access to Complex Amines: Unified Total Synthesis of Stemoamide-Type Alkaloids. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210372] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasukazu Sugiyama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yasuki Soda
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Makoto Yoritate
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Hayato Tajima
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Yoshito Takahashi
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kana Shibuya
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Chisato Ogihara
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takashi Yokoyama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takeshi Oishi
- School of Medicine, Keio University, 4-1-1, Hiyoshi, Kohoku-ku, Yokohama 223-8521, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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11
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Shi T, Cao F, Chen J, Wang X, Yin G, Wang H, Wang Z. Total syntheses of seven stemoamide-type Stemona alkaloids. Org Chem Front 2022. [DOI: 10.1039/d1qo01578h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Six Stemona alkaloids were synthesized racemically using stemoamide, obtained via a cascade cyclization or our reported transannular cyclization of parvistemoamide, as the common intermediate.
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Affiliation(s)
- Tao Shi
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Fei Cao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jinhong Chen
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Xiaodong Wang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Gaofeng Yin
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
| | - Huihong Wang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Zhen Wang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, China
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- School of Pharmaceutical Science, Hengyang Medical School, University of South China, Hengyang 421001, China
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12
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Wang X, Shi T, Yin G, Wang Y, Li Z, Wang Z. Asymmetric Total Syntheses of Five Pyrrole-Type Stemona Alkaloids. Org Chem Front 2022. [DOI: 10.1039/d2qo00456a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The asymmetric total syntheses of five pyrrole-type Stemona alkaloids and two stereoisomers were accomplished, among which 3-n-butylneostemonine and bisdehydroneostemonine were synthesized for the first time, and the NMR data of...
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13
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Shi T, Wang X, Chen JH, Cao F, Yin G, Zeng YF, Wang Z. Recent Advances in the Transformations of Different Types of Stemona Alkaloids. Org Chem Front 2022. [DOI: 10.1039/d2qo00789d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In recent years, researches on the total syntheses of Stemona alkaloids with different 5/7 bicyclic systems have attracted increasing attention, and the development momentum in this field has gradually changed...
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14
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Deng Y, Liang X, Wei K, Yang YR. Ir-Catalyzed Asymmetric Total Syntheses of Bisdehydrotuberostemonine D, Putative Bisdehydrotuberostemonine E and Structural Revision of the Latter. J Am Chem Soc 2021; 143:20622-20627. [PMID: 34870982 DOI: 10.1021/jacs.1c11265] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The first total syntheses of bisdehydrotuberostemonine D (8) and putative bisdehydrotuberostemonine E (9), two novel pyrrole Stemona alkaloids, along with the synthesis of bisdehydrotuberostemonine (3) have been completed in 12-13 steps. Our strategy harnesses the power of transition-metal-catalyzed reactions employing Ir, Ru, and Pd, in particular Ir-catalyzed asymmetric allylation of aldehydes, two distinct protocols recently developed by Carreira and Krische, respectively. The threefold use of Ir catalysis, first in the stereodivergent construction of two contiguous stereocenters at C (9,10) and then in rapid formation of the two γ-butyrolactone motifs, enabled the route's efficiency. Through this work, the originally assigned structure of bisdehydrotuberostemonine E (9) should be revised as 18α-bisdehydrotuberostemonine D (8*).
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Affiliation(s)
- Yi Deng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiao Liang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Kun Wei
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Yu-Rong Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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