1
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Kourgiantaki M, Zografos AL. Decoding Guaianolide Biosynthesis: Synthetic Insights into Pseudoguaianolides and Seco-Guaianolides. Org Lett 2025; 27:5039-5043. [PMID: 40357571 DOI: 10.1021/acs.orglett.5c00485] [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: 05/15/2025]
Abstract
The biosynthetic pathways leading to pseudoguaianolides and seco-guaianolides remain unclear. In this work, we demonstrate that highly oxidized 8,12-guaianolides serve as unprecedented precursors, enabling chemoselective, one-step access to pseudoguaianolide, seco-guaianolide, and xanthanolide-type sesquiterpenoids. Key mechanistic insights reveal the pivotal role of peroxide substituents on the guaianolide core and stereoelectronic factors in controlling reaction outcomes. These findings shed light on guaianolide selectivity and may mirror actual biosynthetic pathways, offering transformative potential for oxidative transformations in sesquiterpenoid synthesis.
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Affiliation(s)
- Maria Kourgiantaki
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Main University Campus, 54124 Thessaloniki, Greece
| | - Alexandros L Zografos
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Main University Campus, 54124 Thessaloniki, Greece
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2
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Pereira J, Casaretto N, Frison G, Nay B. Bio-inspired total synthesis of daphnepapytone A. Chem Sci 2025:d5sc02953h. [PMID: 40417298 PMCID: PMC12096516 DOI: 10.1039/d5sc02953h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2025] [Accepted: 05/16/2025] [Indexed: 05/27/2025] Open
Abstract
Daphnepapytone A (1) is an unprecedented guaiane-derived sesquiterpene characterized by a bridged and highly substituted cyclobutane. We describe its total synthesis through a bio-inspired sequence of skeleton construction and late-stage oxidation. After the Eschenmoser-Tanabe fragmentation of (R)-carvone epoxide, the allenylation of the resulting aldehyde was followed by an allenic Pauson-Khand reaction with distal regioselectivity in the presence of [Rh(CO)2Cl]2 to give the guaiane skeleton. Oleodaphnone (3) was identified as a key intermediate of this strategy and was engaged in a biomimetic [2 + 2]-photocycloaddition, leading to the bridged cyclobutane of the title compound. Finally, a late-stage C-H oxidation chemoselectively released a triketone intermediate (15), which was reduced in a remarkably chemo- and stereoselective manner to furnish target compound 1. During this work, complex rearrangements of the bridged skeleton were observed. Beside the total synthesis of daphnepapytone A, this paper also describes the total synthesis of three guaiane natural products (oleodaphnone, diarthroncha C, daphnenicillata W), one of them being structurally revised.
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Affiliation(s)
- Joan Pereira
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau Cedex France
| | - Nicolas Casaretto
- Laboratoire de Chimie Moléculaire, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau Cedex France
| | - Gilles Frison
- Laboratoire de Chimie Théorique, Sorbonne Université, CNRS F-75005 Paris France
| | - Bastien Nay
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris Route de Saclay F-91128 Palaiseau Cedex France
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3
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Zhang Y, Yu P, Chen W, Li J, Liu K, Xie X, Li H, She X. Bioinspired Stereoselective Total Synthesis of the Caged Sesquiterpenoid Daphnepapytone A. Org Lett 2025. [PMID: 40372148 DOI: 10.1021/acs.orglett.5c01509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2025]
Abstract
The first total synthesis of the novel caged sesquiterpenoid daphnepapytone A is disclosed. Key reactions include a Pauson-Khand cycloaddition to provide oleodaphone, a bioinspired photoinduced [2 + 2] cycloaddition to forge the cyclobutane-containing caged skeleton, and a C-H oxidation and reduction protocol to generate daphnepapytone A. Finally, the 17-step synthetic sequence is shortened to 4 steps in protecting group-free and exclusively stereoselective fashion.
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Affiliation(s)
- Yan Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Pengfei Yu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Wei Chen
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Jia Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Kai Liu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Xingang Xie
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Huilin Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
- State Key Laboratory of Green Pesticide, Guizhou University, Guiyang 550025, P. R. China
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
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4
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Meng L, Liu J, Sun Z, Hou Y, Huang Q, Tang P. Forging the tricyclic core framework of euphordraculoate B via a Barbier-type allyl addition. Org Biomol Chem 2025; 23:589-592. [PMID: 39607753 DOI: 10.1039/d4ob01743a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2024]
Abstract
A novel strategy for the synthesis of an advanced intermediate en route to the tigliane derivative euphordraculoate B was described, which led to the successful construction of the 5/5/6 tricyclic core framework as well as the multiple consecutive stereocenters on the skeleton. Key steps of the strategy include a chlorination reaction, an aldol reaction, and a Barbier-type allyl addition.
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Affiliation(s)
- Lingduan Meng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Jingjing Liu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Zeying Sun
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Yangdong Hou
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Qingyun Huang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
| | - Pingping Tang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China.
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5
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Demertzidou VP, Kourgiantaki M, Zografos AL. Expanding Natural Diversity: Tailored Enrichment of the 8,12-Sesquiterpenoid Lactone Chemical Space through Divergent Synthesis. Org Lett 2024; 26:4648-4653. [PMID: 38780007 PMCID: PMC11187629 DOI: 10.1021/acs.orglett.4c01374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/21/2024] [Accepted: 05/22/2024] [Indexed: 05/25/2024]
Abstract
The divergent synthesis of a non-natural 8,12-sesquiterpenoid lactone collection is described. The synthesis relies on a rationally designed guaianolide scaffold bearing a tertiary hydroxyl as the pinpoint for inducing its selective diversification. Key reactions include an unprecedented Suarez-type CH lactonization and a highly diastereoselective oxy-Cope/ene cascade that allows the introduction of three stereocenters in a single operation. Selective oxidative/reductive and redox neutral transformations follow to highlight the synthesis of naturally unpresented highly substituted 8,12-guaianolides.
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Affiliation(s)
| | | | - Alexandros L. Zografos
- Aristotle University of
Thessaloniki, Department of Chemistry,
Laboratory of Organic Chemistry, Thessaloniki 54124, Greece
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6
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Chen B, Zhang X, Yang Y, Xu D, Wu Q, Wang S, Bao S, Zhang X, Ding Y, Wang L, Chen Y. Hypocretenolides: collective total syntheses and activities toward metastatic colon cancer. Chem Sci 2024; 15:6397-6401. [PMID: 38699277 PMCID: PMC11062092 DOI: 10.1039/d4sc01469c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Accepted: 03/26/2024] [Indexed: 05/05/2024] Open
Abstract
A concise and collective synthetic route to hypocretenolides was developed for the first time. This route features one-pot addition-alkylation and intramolecular 1,3-dipolar cycloaddition to efficiently assemble the 5/7/6 ring system. Our syntheses enabled multigram preparation of hypocretenolide which facilitated further biological evaluation. Preliminary CCK-8 cytotoxic results of hypocretenolide indicated its IC50 values within 1 μM against 4 colon cancer cell lines. Wound healing and transwell assays suggested the promising inhibitory activities of hypocretenolide toward the migratory capabilities of colon cancer cells in vitro. The animal results confirmed that hypocretenolide can inhibit metastasis of colon cancer cells.
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Affiliation(s)
- Bolin Chen
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for New Organic Matter, Nankai University 94 Weijin Road Tianjin 300071 China
| | - Xijing Zhang
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for New Organic Matter, Nankai University 94 Weijin Road Tianjin 300071 China
| | - Yufen Yang
- College of Pharmacy, Nankai University 38 Tongyan Road Tianjin 300353 China
| | - Dongdong Xu
- College of Pharmacy, Nankai University 38 Tongyan Road Tianjin 300353 China
| | - Qianwei Wu
- College of Pharmacy, Nankai University 38 Tongyan Road Tianjin 300353 China
| | - Shibo Wang
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for New Organic Matter, Nankai University 94 Weijin Road Tianjin 300071 China
| | - Shiqi Bao
- Accendatech Co. Ltd 32nd Floor, Rongqiao Center, Intersection of Changjiang Road and Nankai Six Road Tianjin 300102 China
| | - Xuemei Zhang
- Accendatech Co. Ltd 32nd Floor, Rongqiao Center, Intersection of Changjiang Road and Nankai Six Road Tianjin 300102 China
| | - Yahui Ding
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for New Organic Matter, Nankai University 94 Weijin Road Tianjin 300071 China
| | - Liang Wang
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for New Organic Matter, Nankai University 94 Weijin Road Tianjin 300071 China
| | - Yue Chen
- State Key Laboratory of Medicinal Chemical Biology, Frontiers Science Center for New Organic Matter, Nankai University 94 Weijin Road Tianjin 300071 China
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7
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Zhao P, Xin BS, Ma ZT, Yao GD, Shi R, He XH, Lin B, Huang XX, Song SJ. Six undescribed guaianolide-type sesquiterpenes from the aerial parts of Daphne penicillata. Fitoterapia 2024; 172:105762. [PMID: 38040095 DOI: 10.1016/j.fitote.2023.105762] [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: 09/15/2023] [Revised: 11/14/2023] [Accepted: 11/27/2023] [Indexed: 12/03/2023]
Abstract
Six undescribed guaianolide sesquiterpenes (1-6) were obtained from the aerial parts of Daphne penicillata. Their structures and absolute configuration were elucidated by HRESIMS, NMR analyses, ECD calculations and single-crystal X-ray diffraction analysis. Structurally, all compounds possess the typical 5,7-fused system of 8,12-guaianolides and this guaianolide-type was first reported to be isolated from Daphne penicillata. All compounds (1-6) were evaluated for anti-inflammatory and cytotoxic activity. Among them, compounds 1 and 5 showed moderate inhibitory effects on LPS-induced NO production in BV2 cells and 4 displayed potential inhibition against Hep3B cells with an IC50 value of 7.33 μM.
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Affiliation(s)
- Peng Zhao
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Ben-Song Xin
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Zhen-Tao Ma
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Guo-Dong Yao
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
| | - Rui Shi
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, International Ecological Foresty Research Center of Kunming, Horticulture and Landscape Architecture, Southwest Forestry University, Yunnan, Kunming 650224, China
| | - Xia-Hong He
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, International Ecological Foresty Research Center of Kunming, Horticulture and Landscape Architecture, Southwest Forestry University, Yunnan, Kunming 650224, China
| | - Bin Lin
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, China
| | - Xiao-Xiao Huang
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China; Basic Science Research Center Base (Pharmaceutical Science), Shandong Province, Yantai University, Yantai 264005, China.
| | - Shao-Jiang Song
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China
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8
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Fernandes RA. Deciphering the quest in the divergent total synthesis of natural products. Chem Commun (Camb) 2023; 59:12205-12230. [PMID: 37746673 DOI: 10.1039/d3cc03564f] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
The divergent synthesis of natural products is rapidly developing towards achieving the goal of efficiency and economy in total synthesis. However, presently, the sustainable development of the synthesis of natural products does not permit the linear synthesis of a single target. In this case, divergent total synthesis is based on the identification of an advanced intermediate with structural features that can be mapped in more than two molecules. However, the identification of this intermediate and its scalable synthesis in enantiopure form are challenging. Herein, we present the details of the ingenious efforts by researchers in the last six years toward the divergent synthesis of two to as many as eight natural products initially via a single route, and then diverging from a common intermediate and further branching out toward several natural products. The planning and strategies adopted can serve as guidelines for the future development of efficient divergent routes aimed at achieving higher efficiency toward multiple targets, causing divergent synthesis to become an accepted common practice.
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Affiliation(s)
- Rodney A Fernandes
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, Maharashtra, India.
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9
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Fernandes RA, Moharana S, Khatun GN. Recent advances in the syntheses of guaianolides. Org Biomol Chem 2023; 21:6652-6670. [PMID: 37551715 DOI: 10.1039/d3ob01019h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Sesquiterpene lactones, especially guaianolides representing a bigger class of natural products, have served as appealing candidates for total synthesis due to their varied bio- and pharmaceutical activities. This tutorial review delineates the creative efforts of many researchers in the total syntheses of different complex guaianolides recently published in the literature. Many of the syntheses display meticulous interplay between new methods and the ingenuity of strategies achieved through well-planned routes. In some cases, the Chiron approach has come in quite handy, wherein the structural features and stereochemistry of select molecules could map well with naturally available starting materials. A few catalytic methods like diastereoselective aldol reaction, enediyne or dienyne metathesis, or photochemical methods have been efficiently used. This compilation also aims to enhance the diversity space based on these natural products and further interest in the sustainable total synthesis of this class of compounds and related molecules.
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Affiliation(s)
- Rodney A Fernandes
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India.
| | - Sanjita Moharana
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India.
| | - Gulenur Nesha Khatun
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India.
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10
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Tan Z, Chen L, Li L, Li Y, Luo Y, Wang F, Dong S, Feng X. Asymmetric Synthesis of α-Methylene-γ-Butyrolactones via Tandem Allylboration/Lactonization: a Kinetic Resolution Process. Angew Chem Int Ed Engl 2023; 62:e202306146. [PMID: 37302984 DOI: 10.1002/anie.202306146] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/07/2023] [Accepted: 06/09/2023] [Indexed: 06/13/2023]
Abstract
The α-methylene-γ-butyrolactone motif is a widely encountered unit in many natural products and pharmaceutical compounds. Herein, a practical and efficient synthesis of α-methylene-γ-butyrolactones from readily available allylic boronates and benzaldehyde derivatives was developed with chiral N,N'-dioxide/AlIII complex as the catalyst. The key success of this transformation was the kinetic resolution of allylboration intermediate via asymmetric lactonization. This protocol enabled to assemble all of four stereoisomers from the same set of starting materials upon variable lactonization. Taking advantage of the current method as the key step, catalytic asymmetric total synthesis of eupomatilones 2, 5, and 6 was accomplished. Control experiments were carried out to probe into the tandem reaction as well as the origin of stereoselectivities.
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Affiliation(s)
- Zheng Tan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Long Chen
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Lingyu Li
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610064, China
| | - Yuzhen Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Yao Luo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Fei Wang
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610064, China
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China
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11
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Kourgiantaki M, Demertzidou VP, Zografos AL. Short Scalable Route to Apiaceae Sesquiterpene Scaffolds: Total Synthesis of 4- epi-Epiguaidiol A. Org Lett 2022; 24:8476-8480. [PMID: 36264031 DOI: 10.1021/acs.orglett.2c03215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The oxy-Cope/ene reaction cascade to form a locked elemane conformer allows the short scalable synthesis of versatile Apiaceae scaffolds. The divergent fate of the obtained macrocyclic germacrane is surveyed under cationic and dioxygen-induced Prins-type reaction conditions to allow the diastereoselective synthesis of oxidized Apiaceae guaiane congeners and the total synthesis of 4-epi-epiguaidiol A. Additionally, the unprecedented reduction of a hydrogen-bond-biased guaiane substrate permits the chemoselective synthesis of desoxo-jungiaguaiane.
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Affiliation(s)
- Maria Kourgiantaki
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Vera P Demertzidou
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Alexandros L Zografos
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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12
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Maity R, Hajra S. Asymmetric Total Synthesis of Eupalinilide E, a Promoter of Human HSPC Expansion. Org Lett 2022; 24:4745-4749. [PMID: 35763266 DOI: 10.1021/acs.orglett.2c01684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A concise and scalable asymmetric total synthesis of eupalinilde E from (R)-(-)-carvone in 12 steps is reported with an overall yield of 20%. The key steps of the synthesis are a tandem Favorskii rearrangement-elimination reaction in the chromatography-free synthesis of carvone-derived 2-cyclopentene carbaldehyde and its catalyst-free stereospecific tandem allylboration-lactonization using recyclable trifluoroethanol as a promoter and solvent affording β-hydroxymethyl-α-methylene-γ-butyrolactone.
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Affiliation(s)
- Ramkrishna Maity
- Centre of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow 226014, Uttar Pradesh, India
| | - Saumen Hajra
- Centre of Biomedical Research, Sanjay Gandhi Post-Graduate Institute of Medical Sciences Campus, Raebareli Road, Lucknow 226014, Uttar Pradesh, India
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13
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Xiao S, Ai L, Liu Q, Yang B, Huang J, Xue W, Chen Y. Total Synthesis of Natural Terpenoids Enabled by Cobalt Catalysis. Front Chem 2022; 10:941184. [PMID: 35783212 PMCID: PMC9241582 DOI: 10.3389/fchem.2022.941184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 05/17/2022] [Indexed: 12/01/2022] Open
Abstract
Transition metal catalysis plays an essential role in the total synthesis of natural products. Cobalt-mediated asymmetric catalysis has successfully been used as a primary or a secondary step in the total synthesis of natural products, especially terpenoids. Terpenoids represent one of the most prominent families among various categories of natural products, attracting immense attention due to their promising physiological activities. This review summarizes the recent advances toward the total synthesis of terpenoids by cobalt-mediated asymmetric catalysis, which may shed some light on their future synthetic efforts toward natural pesticides such as celanguline, azadirachtin, etc.
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Affiliation(s)
| | | | | | | | | | - Wei Xue
- *Correspondence: Yang Chen, ; Wei Xue,
| | - Yang Chen
- *Correspondence: Yang Chen, ; Wei Xue,
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14
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Kimura Y, Ohashi E, Karanjit S, Taniguchi T, Nakayama A, Imagawa H, Sato R, Namba K. Total Syntheses of Proposed Structures of 4,10-Dihydroxy-8,12-guaianolides. Org Lett 2022; 24:3297-3301. [PMID: 35446586 DOI: 10.1021/acs.orglett.2c01215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first total syntheses of two 4,10-dihydroxy-8,12-guaianolides that were reported to be natural products were achieved. Toward the syntheses of a collection of related guaianolides, the typical 5,7-fused system of 8,12-guaianolides was constructed by a ring expansion reaction of a hydroxylated coronafacic acid analogue that can be practically synthesized and optically resolved. The total syntheses of these compounds revealed that the previously reported structures of both natural products were incorrect.
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Affiliation(s)
- Yuki Kimura
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Eisaku Ohashi
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Sangita Karanjit
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Takashi Taniguchi
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Atsushi Nakayama
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Hiroshi Imagawa
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Ryota Sato
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Kosuke Namba
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
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15
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Myasoedova YV, Garifullina LR, Belyaeva ER, Ishmuratov GY. Ozonolytic transformations of (
R
)‐(−)‐carvon in the presence of pyridine. J CHIN CHEM SOC-TAIP 2022. [DOI: 10.1002/jccs.202200035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuliya V. Myasoedova
- Ufa Institute of Chemistry, Ufa Federal Research Center Russian Academy of Sciences Ufa Russia
| | - Liliya R. Garifullina
- Ufa Institute of Chemistry, Ufa Federal Research Center Russian Academy of Sciences Ufa Russia
| | - Evelina R. Belyaeva
- Ufa Institute of Chemistry, Ufa Federal Research Center Russian Academy of Sciences Ufa Russia
| | - Gumer Yu Ishmuratov
- Ufa Institute of Chemistry, Ufa Federal Research Center Russian Academy of Sciences Ufa Russia
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16
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Liu W, Winssinger N. Synthesis of α-exo-Methylene-γ-butyrolactones: Recent Developments and Applications in Natural Product Synthesis. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1577-6085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractThe α-exo-methylene-γ-butyrolactone moiety is present in a vast array of structurally diverse natural products and is often central to their biological activity. In this short review, we summarize new approaches to α-exo-methylene-γ-butyrolactones developed over the past decade as well as their applications in total synthesis.1 Introduction2 Approaches to α-exo-Methylene-γ-butyrolactones2.1 Enantioselective Synthesis via Lactonization Approaches2.2 Enantioselective Halolactonizations2.3 Enantioselective Barbier-Type Allylation2.4 C–H Insertion/Olefination Sequences2.5 Alkene Cyclization2.6 Strain-Driven Dyotropic Rearrangement3 β-(Hydroxymethylalkyl)-α-exo-methylene-γ-butyrolactones4 Applications in Total Synthesis4.1 Sesquiterpene Lactones4.2 Lignans4.3 Other Monocyclic Natural Products4.4 Choice of Methodology in Recent Total Syntheses5 Summary and Outlook
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17
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Emmetiere F, Ratnayake R, Schares HAM, Jones KFM, Bevan-Smith E, Luesch H, Harki DA, Grenning AJ. Function-Oriented and Modular (+/-)-cis-Pseudoguaianolide Synthesis: Discovery of New Nrf2 Activators and NF-κB Inhibitors. Chemistry 2021; 27:5564-5571. [PMID: 33502811 DOI: 10.1002/chem.202100038] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 01/21/2021] [Indexed: 12/26/2022]
Abstract
Described herein is a function-oriented synthesis route and biological evaluation of pseudoguaianolide analogues. The 10-step synthetic route developed retains the topological complexity of the natural product, installs functional handles for late-stage diversification, and forges the key bioactive Michael acceptors early in the synthesis. The analogues were found to be low-micromolar Nrf2 activators and micromolar NF-κB inhibitors and dependent on the local environment of the Michael acceptor moieties.
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Affiliation(s)
- Fabien Emmetiere
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32608, USA
| | - Ranjala Ratnayake
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL, 32610, USA
| | - Henry A M Schares
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Katherine F M Jones
- Department of Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Emily Bevan-Smith
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32608, USA
| | - Hendrik Luesch
- Department of Medicinal Chemistry and Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, Gainesville, FL, 32610, USA
| | - Daniel A Harki
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA.,Department of Chemistry, University of Minnesota, Minneapolis, MN, 55455, USA
| | - Alexander J Grenning
- Department of Chemistry, University of Florida, PO Box 117200, Gainesville, FL, 32608, USA
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18
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Abstract
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An enantioselective total synthesis of plagiochianin B is described that employs
(+)-3-carene as its point of departure and delivers the enantiomer of the natural
product. Key features of the synthesis include a palladium-mediated regioselective
oxidative cleavage of an olefin residing on a pyridine derived from a 6π-azatriene
electrocyclization.
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Affiliation(s)
- Richard K Jackson
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - John L Wood
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
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19
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Xuan J, Haelsig KT, Sheremet M, Machicao PA, Maimone TJ. Evolution of a Synthetic Strategy for Complex Polypyrrole Alkaloids: Total Syntheses of Curvulamine and Curindolizine. J Am Chem Soc 2021; 143:2970-2983. [PMID: 33570388 DOI: 10.1021/jacs.0c13465] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Structurally unprecedented antibacterial alkaloids containing multiple electron-rich pyrrole units have recently been isolated from Curvularia sp. and Bipolaris maydis fungi. This article documents the evolution of a synthetic program aimed at accessing the flagship metabolites curvulamine and curindolizine which are presumably a dimer and trimer of a C10N biosynthetic building block, respectively. Starting with curvulamine, we detail several strategies to merge two simple, bioinspired fragments, which while ultimately unsuccessful, led us toward a pyrroloazepinone building block-based strategy and an improved synthesis of this 10π-aromatic heterocycle. A two-step annulation process was then designed to forge a conserved tetracyclic bis-pyrrole architecture and advanced into a variety of late-stage intermediates; unfortunately, however, a failed decarboxylation thwarted the total synthesis of curvulamine. By tailoring our annulation precursors, success was ultimately found through the use of a cyanohydrin nucleophile which enabled a 10-step total synthesis of curvulamine. Attempts were then made to realize a biomimetic coupling of curvulamine with an additional C10N fragment to arrive at curindolizine, the most complex family member. Although unproductive, we developed a 14-step total synthesis of this alkaloid through an abiotic coupling approach. Throughout this work, effort was made to harness and exploit the innate reactivity of the pyrrole nucleus, an objective which has uncovered many interesting findings in the chemistry of this reactive heterocycle.
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Affiliation(s)
| | | | | | | | - Thomas J Maimone
- Department of Chemistry, University of California, Berkeley, 826 Latimer Hall, Berkeley, California 94720, United States
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20
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Wu J, Ma Z. Metal-hydride hydrogen atom transfer (MHAT) reactions in natural product synthesis. Org Chem Front 2021. [DOI: 10.1039/d1qo01139a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Functionalization of olefins has been an important transformation in synthetic chemistry. This review will focus on the natural product synthesis employing the MHAT reaction as the key strategy.
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Affiliation(s)
- Jinghua Wu
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou 510641, People's Republic of China
| | - Zhiqiang Ma
- Key Lab of Functional Molecular Engineering of Guangdong Province, School of Chemistry & Chemical Engineering, South China University of Technology, Wushan Road-381, Guangzhou 510641, People's Republic of China
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21
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Lee YH, Denton EH, Morandi B. Modular Cyclopentenone Synthesis through the Catalytic Molecular Shuffling of Unsaturated Acid Chlorides and Alkynes. J Am Chem Soc 2020; 142:20948-20955. [DOI: 10.1021/jacs.0c10832] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yong Ho Lee
- ETH Zürich, Vladimir-Prelog-Weg 3, HCI, 8093 Zürich, Switzerland
| | | | - Bill Morandi
- ETH Zürich, Vladimir-Prelog-Weg 3, HCI, 8093 Zürich, Switzerland
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22
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Evolution of Pauson-Khand Reaction: Strategic Applications in Total Syntheses of Architecturally Complex Natural Products (2016–2020). Catalysts 2020. [DOI: 10.3390/catal10101199] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Metal-mediated cyclizations are important transformations in a natural product total synthesis. The Pauson-Khand reaction, particularly powerful for establishing cyclopentenone-containing structures, is distinguished as one of the most attractive annulation processes routinely employed in synthesis campaigns. This review covers Co, Rh, and Pd catalyzed Pauson-Khand reaction and summarizes its strategic applications in total syntheses of structurally complex natural products in the last five years. Additionally, the hetero-Pauson-Khand reaction in the synthesis of heterocycles will also be discussed. Focusing on the panorama of organic synthesis, this review highlights the strategically developed Pauson-Khand reaction in fulfilling total synthetic tasks and its synthetic attractiveness is aimed to be illustrated.
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23
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Harmange Magnani CS, Thach DQ, Haelsig KT, Maimone TJ. Syntheses of Complex Terpenes from Simple Polyprenyl Precursors. Acc Chem Res 2020; 53:949-961. [PMID: 32202757 DOI: 10.1021/acs.accounts.0c00055] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
From structure elucidation and biogenesis to synthetic methodology and total synthesis, terpene natural products have profoundly influenced the development of organic chemistry. Moreover, their myriad functional attributes range from fragrance to pharmaceuticals and have had great societal impact. Ruzicka's formulation of the "biogenetic isoprene rule," a Nobel Prize winning discovery now over 80 years old, allowed for identification of higher order terpene (aka "isoprenoid") structures from simple five-carbon isoprene fragments. Notably, the isoprene rule still holds pedagogical value to students of organic chemistry today. Our laboratory has completed syntheses of over two dozen terpene and meroterpene structures to date, and the isoprene rule has served as a key pattern recognition tool for our synthetic planning purposes. At the strategic level, great opportunity exists in finding unique and synthetically simplifying ways to connect the formal C5 isoprene fragments embedded in terpenes. Biomimetic cationic polyene cyclizations represent the earliest incarnation of this idea, which has facilitated expedient routes to certain terpene polycycle classes. Nonetheless, a large swath of terpene chemical space remains inaccessible using this approach.In this Account, we describe strategic insight into our endeavors in terpene synthesis published over the last five years. We show how biosynthetic understanding, combined with a desire to utilize abundant and inexpensive [C5]n building blocks, has led to efficient, abiotic syntheses of multiple complex terpenes with disparate ring systems. Informed by nature, but unconstrained by its processes, our synthetic assembly exploits chemical reactivity across diverse reaction types-including radical, anionic, pericyclic, and metal-mediated transformations.First, we detail an eight-step synthesis of the cembrane diterpene chatancin from dihydrofarnesal using a bioinspired-but not -mimetic-cycloaddition. Next, we describe the assembly of the antimalarial cardamom peroxide using a polyoxygenation cascade to fuse multiple units of molecular oxygen onto a dimeric skeleton. This three-to-four-step synthesis arises from (-)-myrtenal, an inexpensive pinene oxidation product. We then show how a radical cyclization cascade can forge the hallmark cyclooctane ring system of the complex sesterterpene 6-epi-ophiobolin N from two simple polyprenyl precursors, (-)-linalool and farnesol. To access the related, more complex metabolite 6-epi-ophiobolin A, we exploited the plasticity of our synthetic route and found that use of geraniol (C10) rather than farnesol (C15) gave us the flexibility needed to address the additional oxidation found in this congener. Following this work, we describe two strategies to access several guaianolide sesquiterpenes. Retrosynthetic disconnection to monoterpenes, carvone or (-)-linalool, coupled with a powerful allylation strategy allowed us to address guaianolides with disparate stereochemical motifs. Finally, we examine a semisynthetic approach to the illicium sesquiterpenes from the abundant 15-carbon feedstock terpene (+)-cedrol using an abiotic ring shift and multiple C-H oxidation reactions inspired by a postulated biosynthesis of this natural product class.
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Affiliation(s)
| | - Danny Q. Thach
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
| | - Karl T. Haelsig
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
| | - Thomas J. Maimone
- Department of Chemistry, University of California—Berkeley, Berkeley, California 94720, United States
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24
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Shao H, Gao X, Wang Z, Gao Z, Zhao Y. Divergent Biomimetic Total Syntheses of Ganocins A–C, Ganocochlearins C and D, and Cochlearol T. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000677] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Hui Shao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Xiaonan Gao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Zhong‐Tian Wang
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Ziwei Gao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Yu‐Ming Zhao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
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25
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Shao H, Gao X, Wang Z, Gao Z, Zhao Y. Divergent Biomimetic Total Syntheses of Ganocins A–C, Ganocochlearins C and D, and Cochlearol T. Angew Chem Int Ed Engl 2020; 59:7419-7424. [PMID: 32096300 DOI: 10.1002/anie.202000677] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/24/2020] [Indexed: 12/13/2022]
Affiliation(s)
- Hui Shao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Xiaonan Gao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Zhong‐Tian Wang
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Ziwei Gao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
| | - Yu‐Ming Zhao
- Key Laboratory of Applied Surface and Colloid Chemistry & School of Chemistry and Chemical EngineeringShaanxi Normal University 620 West Chang'an Ave Xi'an 710119 China
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26
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Ji X, Huang Z, Lumb JP. Synthesis of 1,2-Dihydroisoquinolines by a Modified Pomeranz–Fritsch Cyclization. J Org Chem 2019; 85:1062-1072. [PMID: 31854981 DOI: 10.1021/acs.joc.9b02987] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xiang Ji
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Zheng Huang
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Jean-Philip Lumb
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
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