1
|
Jiang Y, Renata H. Modular chemoenzymatic synthesis of ten fusicoccane diterpenoids. Nat Chem 2024; 16:1531-1538. [PMID: 38710830 DOI: 10.1038/s41557-024-01533-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Accepted: 04/09/2024] [Indexed: 05/08/2024]
Abstract
Fusicoccane diterpenoids display intriguing biological activities, including the ability to act as modulators of 14-3-3 protein-protein interactions. However, their innate structural complexity and diverse oxygenation patterns present enormous synthetic challenges. Here we develop a modular chemoenzymatic approach that combines de novo skeletal construction and late-stage hybrid C-H oxidations to achieve the synthesis of ten complex fusicoccanes in 8-13 steps each. A convergent fragment coupling strategy allowed rapid access to a key tricyclic intermediate, which was subjected to chemical and enzymatic C-H oxidations to modularly prepare five oxidized family members. We also conceived a complementary biomimetic skeletal remodelling strategy to synthetically access five rearranged fusicoccanes with unusual bridgehead double bonds. This work may facilitate future investigation into the biological activities of the fusicoccanes and also inspire the implementation of similar hybrid strategies to provide family-level synthetic solutions to other natural product scaffolds.
Collapse
Affiliation(s)
- Yanlong Jiang
- Department of Chemistry, BioScience Research Collaborative, Rice University, Houston, TX, USA
| | - Hans Renata
- Department of Chemistry, BioScience Research Collaborative, Rice University, Houston, TX, USA.
| |
Collapse
|
2
|
Lee JR, Hwang SJ, Choi Y, Kim J, Lee GS, Lee BS, Kim KH, Kang KB, Lee HJ, Kim CS. Structural Diversification of Pyrazinone Metabolites via Spontaneous Oxa-Michael Addition in Staphylococcus xylosus. JOURNAL OF NATURAL PRODUCTS 2024; 87:1881-1887. [PMID: 38950087 DOI: 10.1021/acs.jnatprod.4c00252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/03/2024]
Abstract
A family of pyrazinone metabolites (1-11) were characterized from Staphylococcus xylosus ATCC 29971. Six of them were hydroxylated or methoxylated, which were proposed to be produced by the rare noncatalytic oxa-Michael addition reaction with a water or methanol molecule. It was confirmed that isopropyl alcohol can also be the Michael donor of the reaction. 1-7 and the synthetic precursor 2a showed significant inhibition of breast cancer cell migration.
Collapse
Affiliation(s)
- Ju Ryeong Lee
- Department of Biopharmaceutical Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Su Jung Hwang
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Yukyung Choi
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Jonghwan Kim
- Department of Biopharmaceutical Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Gyu Sung Lee
- Department of Biopharmaceutical Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Bum Soo Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Kyo Bin Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Hyo-Jong Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Chung Sub Kim
- Department of Biopharmaceutical Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea
| |
Collapse
|
3
|
Weiser M, Pálvölgyi Á, Weil M, Bica-Schröder K. Continuous Enantioselective α-Alkylation of Ketones via Direct Photoexcitation. J Org Chem 2024; 89:8906-8914. [PMID: 38856707 PMCID: PMC11197082 DOI: 10.1021/acs.joc.4c00759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/24/2024] [Accepted: 05/24/2024] [Indexed: 06/11/2024]
Abstract
Motivated by the scarcity of enantioselective direct intermolecular α-alkylation reactions of ketones with simple alkyl halides, we report a photo-organocatalytic process to access diethyl 2-(2-oxocyclohexyl)malonate and derivatives in good yield and enantioselectivity. The reaction design is based on highly abundant and nature-derived 9-amino-9-deoxy-epi-cinchona alkaloids to activate ketones as transient secondary enamines, which exist unfavorably in equilibrium with imines. These condensed species can serve as powerful photoinitiators via direct photoexcitation. This concept provides access to both enantiomeric antipodes. In addition to introducing an uncomplicated batch-optimized procedure, we investigated the feasibility and limitations of implementing the reaction in continuous flow, thus enabling to obtain diethyl 2-(2-oxocyclohexyl)malonate with a productivity of 47 μmol/h and 84% enantioselectivity.
Collapse
Affiliation(s)
- Michael Weiser
- Institute
of Applied Synthetic Chemistry, TU Wien, 1060 Vienna, Austria
| | | | - Matthias Weil
- Institute
of Chemical Technologies and Analytics, TU Wien, 1060 Vienna, Austria
| | | |
Collapse
|
4
|
Li B, Tan C, Ma T, Jia Y. Bioinspired Total Synthesis of Bipolarolides A and B. Angew Chem Int Ed Engl 2024; 63:e202319306. [PMID: 38212293 DOI: 10.1002/anie.202319306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 01/13/2024]
Abstract
We have achieved the first total synthesis of bipolarolides A and B, which possess an intriguing and complex 5/6/6/6/5 caged pentacyclic skeleton with seven contiguous stereocenters. The synthesis features a lithium-halogen exchange/intermolecular nucleophilic addition to link two enantioenriched fragments, two ring-closing metathesis reactions to assemble the five- and eight-membered rings, and a bioinspired Prins reaction/ether formation cascade cyclization to construct the 5/6/6/6/5 caged skeleton.
Collapse
Affiliation(s)
- Bo Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Chuanzhen Tan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Tianhao Ma
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| |
Collapse
|
5
|
Chen B, Yang Y, Zhang X, Xu D, Sun Y, Chen Y, Wang L. Total Syntheses of Brassicicenes A, R, and T. Org Lett 2023. [PMID: 37994662 DOI: 10.1021/acs.orglett.3c03355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
Here, we report concise and divergent total syntheses of fusicoccane members brassicicenes A, R, and T. The key feature of the synthesis is the rapid construction of the 5/8/5 tricyclic core via four steps: aldol reaction, Stork-Danheiser transposition, and ring-closing metathesis from known compounds followed by concise oxidation state adjustment.
Collapse
Affiliation(s)
- Bolin Chen
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Yufen Yang
- College of Pharmacy, Nankai University, Tianjin 300350, China
| | - Xijing Zhang
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Dongdong Xu
- College of Pharmacy, Nankai University, Tianjin 300350, China
| | - Yuanjun Sun
- Academy of Pharmacy, Xi'an Jiaotong-Liverpool University, Suzhou, Jiangsu 215123, China
| | - Yue Chen
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| | - Liang Wang
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, Tianjin 300071, China
| |
Collapse
|