1
|
Wu P, Zeng J, Meng L, Wan Q. Glycosylation with sulfoxide-based glycosyl donors. Chem Commun (Camb) 2024. [PMID: 39046327 DOI: 10.1039/d4cc02838d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
Sulfoxides have emerged as pivotal constituents in modern carbohydrate chemistry. As anomeric leaving groups, sulfinyl moieties may occupy positions directly at the anomeric position or at a more remote site. This feature article is focused on the evolution and notable advancements of glycosyl sulfoxide donors in glycosylation reactions. Its objective is to elucidate the obstacles and prospects within this evolving research domain, with the aim of enhancing comprehension and progress in the field of carbohydrate chemistry.
Collapse
Affiliation(s)
- Pinru Wu
- School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Jing Zeng
- School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Lingkui Meng
- School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
| | - Qian Wan
- School of Pharmacy, Huazhong University of Science and Technology, Wuhan, Hubei, 430030, China
- School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei, 430071, China.
| |
Collapse
|
2
|
Hwang S, Choi M, Jeong M, Lee C. Synthesis of the C13-C27 Fragment of Madeirolide A Using Visible-Light-Promoted Radical Cyclization. Org Lett 2024; 26:1067-1072. [PMID: 38293710 DOI: 10.1021/acs.orglett.3c04305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2024]
Abstract
The convergent synthesis of a fully elaborated C13-C27 fragment of madeirolide A has been achieved. The key features of the synthesis include the stereocontrolled construction of both the THF and THP rings via visible-light-induced iridium-catalyzed radical cyclization and the late-stage union of the two oxacyclic subunits through nickel-catalyzed decarboxylative cross-coupling.
Collapse
Affiliation(s)
- Sunghyun Hwang
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Minchul Choi
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Myungeun Jeong
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Chulbom Lee
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| |
Collapse
|
3
|
Zhang S, Zhang S, Fan Y, Zhang X, Chen J, Jin C, Chen S, Wang L, Zhang Q, Chen Y. Total Synthesis of the Proposed Structure of Neaumycin B. Angew Chem Int Ed Engl 2023; 62:e202313186. [PMID: 37889502 DOI: 10.1002/anie.202313186] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/18/2023] [Accepted: 10/24/2023] [Indexed: 10/28/2023]
Abstract
The total synthesis of the proposed structure of anti-glioblastoma natural product neaumycin B was achieved in 22 steps (longest linear sequence). The synthesis features HCl-mediated [6,6]-spiroketalization, a combination of Krische iridium-catalyzed crotylation, Marshall palladium-catalyzed propargylation, Fürstner nickel-catalyzed regio- and enantioselective vicinal monoprotected diol formation, Brown crotylation and asymmetric halide-aldehyde cycloaddition, so as to establish the challenging contiguous stereocenters.
Collapse
Affiliation(s)
- Sen Zhang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University 38 Tongyan Road, Tianjin 300353 (P. R. China)
| | - Songming Zhang
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, 94 Weijin Road, Tianjin, 300071, P. R. China
| | - Yunlong Fan
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University 38 Tongyan Road, Tianjin 300353 (P. R. China)
| | - Xuhai Zhang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University 38 Tongyan Road, Tianjin 300353 (P. R. China)
| | - Jing Chen
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University 38 Tongyan Road, Tianjin 300353 (P. R. China)
| | - Chaofan Jin
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University 38 Tongyan Road, Tianjin 300353 (P. R. China)
| | - Sisi Chen
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, 94 Weijin Road, Tianjin, 300071, P. R. China
| | - Liang Wang
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, 94 Weijin Road, Tianjin, 300071, P. R. China
| | - Quan Zhang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University 38 Tongyan Road, Tianjin 300353 (P. R. China)
| | - Yue Chen
- State Key Laboratory of Medicinal Chemical Biology, College of Chemistry, Frontiers Science Center for New Organic Matter, Nankai University, 94 Weijin Road, Tianjin, 300071, P. R. China
| |
Collapse
|
4
|
Davies-Coleman MT, McPhail KL, Parker-Nance S. A Quarter Century of Marine Biodiscovery in Algoa Bay, South Africa. JOURNAL OF NATURAL PRODUCTS 2023; 86:638-652. [PMID: 36853972 DOI: 10.1021/acs.jnatprod.2c00987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Algoa Bay, the largest crenulate bay on the southeastern coast of South Africa, is currently one of the most well-studied marine ecosystems in southern Africa. A plethora of endemic marine invertebrates inhabits the benthic reefs on the western edge of the Bay in close proximity to South Africa's sixth largest city. Over the past 25 years, South African marine natural products chemists, together with international collaborators from the US National Cancer Institute and other US institutions, have focused their attention on Algoa Bay's benthic marine invertebrates as a potential source of new anticancer compounds. This review commemorates a quarter of a century of marine biodiscovery in Algoa Bay and presents the structures and bioactivities of 49 new and 36 known specialized metabolites isolated from two molluscs, eight ascidians, and six sponges. Thirty-nine of these compounds were cytotoxic to cancer cells in vitro with 20 exhibiting moderate to potent cytotoxicity. Six other compounds exhibited antimicrobial activity. Foremost among the potential anticancer compounds is mandelalide A (38) from the Algoa Bay ascidian Lissoclinum species.
Collapse
Affiliation(s)
- Michael T Davies-Coleman
- Department of Chemistry, University of the Western Cape, Bellville, 7535, South Africa and Department of Chemistry, Rhodes University, Makhanda, 6140, South Africa
| | - Kerry L McPhail
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Corvallis, Oregaon 97331, United States
| | - Shirley Parker-Nance
- South African Environmental Observation Network, Elwandle Coastal Node, Nelson Mandela University, Ocean Sciences Campus, Summerstrand, Gqeberha, 6001, South Africa
| |
Collapse
|
5
|
Zhang H, Tian Y, Yuan X, Xie F, Yu S, Cai J, Sun B, Shan C, Zhang W. Site-directed late-stage diversification of macrocyclic nannocystins facilitating anticancer SAR and mode of action studies. RSC Med Chem 2023; 14:299-312. [PMID: 36846368 PMCID: PMC9945860 DOI: 10.1039/d2md00393g] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022] Open
Abstract
Nannocystins are a family of 21-membered cyclodepsipeptides with excellent anticancer activity. However, their macrocyclic architecture poses a significant challenge to structure modification. Herein, this issue is addressed by leveraging the strategy of post-macrocyclization diversification. In particular, a novel serine-incorporating nannocystin was designed so that its appending hydroxyl group could diversify into a wide variety of side chain analogues. Such effort facilitated not only structure-activity correlation at the subdomain of interest, but also the development of a macrocyclic coumarin-labeled fluorescence probe. Uptake experiments indicated good cell permeability of the probe, and endoplasmic reticulum was identified as its subcellular localization site.
Collapse
Affiliation(s)
- Han Zhang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Yunfeng Tian
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Xiaoya Yuan
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Fei Xie
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Siqi Yu
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Jiayou Cai
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Bin Sun
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Changliang Shan
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| | - Weicheng Zhang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, and Tianjin Key Laboratory of Molecular Drug Research, Nankai University Tianjin People's Republic of China
| |
Collapse
|
6
|
Fang S, Ling H, Zeng C, Li M, Jiang H, Wu W. Palladium-Catalyzed Sequential Three-Component Cross-Coupling to 1,3-Dienes: Employing Alkenes as Hydride and Alkenyl Donors. J Org Chem 2022; 87:12816-12830. [PMID: 36099344 DOI: 10.1021/acs.joc.2c01406] [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
This report discloses a novel Pd-catalyzed sequential three-component multiple reaction of alkenes, bromoalkynes, and boronic acids using alkenes as hydride and alkenyl donors, leading to highly stereoselective assembly of (Z,E)-1,3-diene derivatives. Mechanistic studies demonstrate that the generation and reutilization of palladium hydride species are critical to the success of this transformation. In addition, the good functional group compatibility, late-stage modification, and investigation of photophysical properties of 1,3-diene products illustrate the synthetic value of this strategy.
Collapse
Affiliation(s)
- Songjia Fang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
| | - Hongling Ling
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
| | - Caijin Zeng
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
| | - Meng Li
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huanfeng Jiang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
| | - Wanqing Wu
- School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P. R. China
| |
Collapse
|
7
|
Mattos DR, Wan X, Serrill JD, Nguyen MH, Humphreys IR, Viollet B, Smith AB, McPhail KL, Ishmael JE. The Marine-Derived Macrolactone Mandelalide A Is an Indirect Activator of AMPK. Mar Drugs 2022; 20:md20070418. [PMID: 35877711 PMCID: PMC9320534 DOI: 10.3390/md20070418] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 06/22/2022] [Accepted: 06/22/2022] [Indexed: 02/06/2023] Open
Abstract
The mandelalides are complex macrolactone natural products with distinct macrocycle motifs and a bioactivity profile that is heavily influenced by compound glycosylation. Mandelalides A and B are direct inhibitors of mitochondrial ATP synthase (complex V) and therefore more toxic to mammalian cells with an oxidative metabolic phenotype. To provide further insight into the pharmacology of the mandelalides, we studied the AMP-activated protein kinase (AMPK) energy stress pathway and report that mandelalide A is an indirect activator of AMPK. Wild-type mouse embryonic fibroblasts (MEFs) and representative human non-small cell lung cancer (NSCLC) cells showed statistically significant increases in phospho-AMPK (Thr172) and phospho-ACC (Ser79) in response to mandelalide A. Mandelalide L, which also harbors an A-type macrocycle, induced similar increases in phospho-AMPK (Thr172) and phospho-ACC (Ser79) in U87-MG glioblastoma cells. In contrast, MEFs co-treated with an AMPK inhibitor (dorsomorphin), AMPKα-null MEFs, or NSCLC cells lacking liver kinase B1 (LKB1) lacked this activity. Mandelalide A was significantly more cytotoxic to AMPKα-null MEFs than wild-type cells, suggesting that AMPK activation serves as a protective response to mandelalide-induced depletion of cellular ATP. However, LKB1 status alone was not predictive of the antiproliferative effects of mandelalide A against NSCLC cells. When EGFR status was considered, erlotinib and mandelalide A showed strong cytotoxic synergy in combination against erlotinib-resistant 11-18 NSCLC cells but not against erlotinib-sensitive PC-9 cells. Finally, prolonged exposures rendered mandelalide A, a potent and efficacious cytotoxin, against a panel of human glioblastoma cell types regardless of the underlying metabolic phenotype of the cell. These results add biological relevance to the mandelalide series and provide the basis for their further pre-clinical evaluation as ATP synthase inhibitors and secondary activators of AMPK.
Collapse
Affiliation(s)
- Daphne R. Mattos
- Department of Pharmaceutical Sciences, College of Pharmacy, Corvallis, OR 97331, USA; (D.R.M.); (X.W.); (J.D.S.); (I.R.H.); (K.L.M.)
| | - Xuemei Wan
- Department of Pharmaceutical Sciences, College of Pharmacy, Corvallis, OR 97331, USA; (D.R.M.); (X.W.); (J.D.S.); (I.R.H.); (K.L.M.)
| | - Jeffrey D. Serrill
- Department of Pharmaceutical Sciences, College of Pharmacy, Corvallis, OR 97331, USA; (D.R.M.); (X.W.); (J.D.S.); (I.R.H.); (K.L.M.)
| | - Minh H. Nguyen
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, USA; (M.H.N.); (A.B.S.III)
| | - Ian R. Humphreys
- Department of Pharmaceutical Sciences, College of Pharmacy, Corvallis, OR 97331, USA; (D.R.M.); (X.W.); (J.D.S.); (I.R.H.); (K.L.M.)
| | - Benoit Viollet
- CNRS, INSERM, Institut Cochin, Université Paris Cité, F-75014 Paris, France;
| | - Amos B. Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, USA; (M.H.N.); (A.B.S.III)
| | - Kerry L. McPhail
- Department of Pharmaceutical Sciences, College of Pharmacy, Corvallis, OR 97331, USA; (D.R.M.); (X.W.); (J.D.S.); (I.R.H.); (K.L.M.)
| | - Jane E. Ishmael
- Department of Pharmaceutical Sciences, College of Pharmacy, Corvallis, OR 97331, USA; (D.R.M.); (X.W.); (J.D.S.); (I.R.H.); (K.L.M.)
- Correspondence:
| |
Collapse
|
8
|
Fernández-Peña L, Díez-Poza C, González-Andrés P, Barbero A. The Tetrahydrofuran Motif in Polyketide Marine Drugs. Mar Drugs 2022; 20:120. [PMID: 35200649 PMCID: PMC8880653 DOI: 10.3390/md20020120] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Revised: 01/20/2022] [Accepted: 02/01/2022] [Indexed: 11/17/2022] Open
Abstract
Oxygen heterocycles are units that are abundant in a great number of marine natural products. Among them, marine polyketides containing tetrahydrofuran rings have attracted great attention within the scientific community due to their challenging structures and promising biological activities. An overview of the most important marine tetrahydrofuran polyketides, with a focused discussion on their isolation, structure determination, approaches to their total synthesis, and biological studies is provided.
Collapse
Affiliation(s)
| | | | | | - Asunción Barbero
- Department of Organic Chemistry, Campus Miguel Delibes, University of Valladolid, 47011 Valladolid, Spain; (L.F.-P.); (C.D.-P.); (P.G.-A.)
| |
Collapse
|
9
|
Petruncio G, Shellnutt Z, Elahi-Mohassel S, Alishetty S, Paige M. Skipped dienes in natural product synthesis. Nat Prod Rep 2021; 38:2187-2213. [PMID: 34913051 DOI: 10.1039/d1np00012h] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Covering: 2000-2020The 1,4-diene motif, also known as a skipped diene, is widespread across various classes of natural products including alkaloids, fatty acids, terpenoids, and polyketides as part of either the finalized structure or a biosynthetic intermediate. The prevalence of this nonconjugated diene system in nature has resulted in numerous encounters in the total synthesis literature. However, skipped dienes have not been extensively reviewed, which could be attributed to overshadowing by the more recognized 1,3-diene system. In this review, we aim to highlight the relevance of skipped dienes in natural products through the lens of total synthesis. Subjects that will be covered include nomenclature, structural properties, prevalence in natural products, synthetic strategies and the future direction of the field.
Collapse
Affiliation(s)
- Greg Petruncio
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| | - Zachary Shellnutt
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| | - Synah Elahi-Mohassel
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| | - Suman Alishetty
- Department of Bioengineering, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA
| | - Mikell Paige
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| |
Collapse
|
10
|
Paul D, Das S, Saha S, Sharma H, Goswami RK. Intramolecular Heck Reaction in Total Synthesis of Natural Products: An Update. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100071] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Debobrata Paul
- School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Subhendu Das
- School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Sanu Saha
- School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Himangshu Sharma
- School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| | - Rajib Kumar Goswami
- School of Chemical Sciences Indian Association for the Cultivation of Science Jadavpur Kolkata 700032 India
| |
Collapse
|
11
|
Zhang W. Heck macrocyclization in natural product total synthesis. Nat Prod Rep 2021; 38:1109-1135. [PMID: 33662070 DOI: 10.1039/d0np00087f] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covering: 1981-2020 Heck macrocyclization is a logical extension of the award-winning Mizoroki-Heck reaction. Through covalent linking of two otherwise discrete coupling partners, the resultant chimeric substrate is transformed into a large ring with enhanced rigidity and unique functional group disposition. Pioneered in the early 1980s, this methodology has evolved into a competent option for creating diverse macrocycles. Despite its growing influence, hitherto no systematic survey has ever appeared in the literature. The present review delineates the state-of-the-art of Heck macrocyclization in the context of natural product synthesis. Sixteen selected cases, each examined from a different perspective, coalesce into the view that the title reaction is a viable tool for synthesis-enabled macrocycle research.
Collapse
Affiliation(s)
- Weicheng Zhang
- The State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300353, People's Republic of China.
| |
Collapse
|
12
|
Hubert P, Seibel E, Beemelmanns C, Campagne J, Figueiredo RM. Stereoselective Construction of (
E,Z
)‐1,3‐Dienes and Its Application in Natural Product Synthesis. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000730] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Pierre Hubert
- ICGM Univ Montpellier, CNRS, ENSCM Montpellier France
| | - Elena Seibel
- Hans-Knöll-Institute (HKI) Beutenbergstrasse 11a 07745 Jena Germany
| | | | | | | |
Collapse
|
13
|
Paul D, Sahana MH, Mandal P, Chakrabarti P, Goswami RK. Biselyngbyolides A & C: their total synthesis and anticancer activities. Org Biomol Chem 2020; 18:7151-7164. [PMID: 32966514 DOI: 10.1039/d0ob00576b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2024]
Abstract
Convergent strategies for the first total synthesis of biselyngbyolide C and an alternative route for the total synthesis of biselyngbyolide A have been developed. The key strategic feature in this study is Heck macrocyclization. The use of intramolecular Heck coupling for biselyngbyolide B was demonstrated by us earlier; however such a strategy has not been explored further for the other members of this family of natural products, in particular, where sensitive skipped olefins are involved. The other highlights of this synthetic study include iterative Crimmins acetate aldol and Wittig olefination processes, followed by the less explored cobalt-hydride-based reduction of an activated olefin and Shiina esterification. Our synthetic study enabled us to amend the reported NMR data of biselyngbyolides A and C. An evaluation of the anticancer activities of both biselyngbyolides A and C revealed that the apoptosis generated in cancer cells followed an intrinsic pathway.
Collapse
Affiliation(s)
- Debobrata Paul
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Moinul Haque Sahana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Pratiti Mandal
- Division of Cell Biology & Physiology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata-700032, India.
| | - Partha Chakrabarti
- Division of Cell Biology & Physiology, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| |
Collapse
|
14
|
Ando K, Oguchi M, Kobayashi T, Asano H, Uchida N. Methylenation for Aldehydes and Ketones Using 1-Methylbenzimidazol-2-yl Methyl Sulfone. J Org Chem 2020; 85:9936-9943. [PMID: 32608238 DOI: 10.1021/acs.joc.0c01227] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The methylenation reagent 1-methylbenzimidazol-2-yl methyl sulfone 2 reacts with various aldehydes and ketones in the presence of t-BuOK (room temperature, 1 h) in dimethylformamide to give the corresponding terminal alkenes generally in high yields. For sensitive substrates, the reaction is better carried out at low temperature using sodium hexamethyldisilazide in 1,2-dimethoxyethane. The byproduct is easily removed from the products, and the reaction conditions are mild and practical. Reagent 2 can be easily prepared from commercially available 2-mercaptobenzimidazole 5 in 95% yield without any expensive reagents.
Collapse
Affiliation(s)
- Kaori Ando
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Mai Oguchi
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Takahisa Kobayashi
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Haruka Asano
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Nariaki Uchida
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| |
Collapse
|
15
|
Deng Y, Smith AB. Evolution of Anion Relay Chemistry: Construction of Architecturally Complex Natural Products. Acc Chem Res 2020; 53:988-1000. [PMID: 32270672 PMCID: PMC7301606 DOI: 10.1021/acs.accounts.0c00076] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Multicomponent union tactics in which three or more fragments are rapidly connected are highly prized in the construction of architecturally complex natural products. Anion Relay Chemistry (ARC), a multicomponent union tactic, has just such potential to elaborate structurally diverse scaffolds in a single operation with excellent stereochemical control. Conceptually, the ARC tactic can be divided into two main classes: "Through-Bond," by the relay of negative charge through the bonding system of a molecule; and "Through-Space," by the migration of negative charge across space by a transfer agent. "Through-Space" Anion Relay Chemistry, the focus of this Account, can be further subdivided into two types: Type I ARC, originated from the Tietze-Schaumann-Smith coupling reaction, which for the first time permits controllable Brook rearrangements to construct unsymmetrical adducts, and as such has been successfully employed in the total syntheses of diverse natural products, including the mycoticins, bryostatin 1, spongistatins, rimocidin, indolizidine alkaloids, and enigmazole A; and Type II ARC, central to which is the design of novel bifunctional linchpins that enable rapid assembly of linear and cyclic fragments with diverse architectural features, ranging from polyols, spiroketals, and polyenes to polypropionate scaffolds. Recently, the Type II ARC tactic has been exploited as the key construction tactic in the total syntheses of the spirastrellolides, the cryptocarya acetates, secu'amamine A, mandelalide A, and nahuoic acid Ci (Bii). This Account will present the evolution of both the Type I and Type II Anion Relay tactics, in conjunction with some prominent applications.
Collapse
Affiliation(s)
- Yifan Deng
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| | - Amos B. Smith
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|
16
|
Hu T, Huang L, Gao L, Song Z. Synthesis of unsymmetrical diarylmethanols via C–Si bond bifunctionalization enabled by sequential [1,4]-Csp 2 to O-silyl migration. Org Chem Front 2020. [DOI: 10.1039/c9qo01450k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unsymmetrical C–Si bond bifunctionalization of 2,2′-bis(trimethylsilyl) diphenylmethanol via “on–off–on” sequential [1,4]-Csp2 to O-silyl migration installs Csp3/Csp3, Csp3/Csp2 or Csp2/Csp3 in one pot, giving sterically congested unsymmetrical diarylmethanols in good yields.
Collapse
Affiliation(s)
- Tianbao Hu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| | - Liying Huang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| | - Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology
- West China School of Pharmacy
- Sichuan University
- Chengdu 610041
| |
Collapse
|
17
|
Wang K, Li L, Hu T, Gao L, Song Z. One-Pot Twofold Unsymmetrical C-Si Bond 2,6-Bifunctionalization of Arenes via Sequential [1,4]-Csp 2 to O-Silyl Migration. J Org Chem 2019; 84:12583-12595. [PMID: 31499002 DOI: 10.1021/acs.joc.9b02014] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Twofold unsymmetrical C-Si bond bifunctionalization of 2,6-di(trimethylsilyl) benzyl alcohols has been achieved in one pot via sequential [1,4]-Csp2 to O-silyl migration. The hydroxyl group functions as an "on-off-on" switch to control two successive silyl migrations, and 4,7-dimethyl-o-phenanthroline ligand favors cleavage of the endocyclic C-Si bond. Diverse Csp3/Csp3 or Csp2/Csp3 electrophiles can be installed at the 2- and 6-positions. This approach was used to chemoselectively functionalize the three C-Si bonds of 2,4,6-tri(trimethylsilyl) benzyl alcohol, transforming it into isochroman derivatives. The approach even works as a five-component reaction to construct complex symmetric structures.
Collapse
Affiliation(s)
- Kai Wang
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology, Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy , Sichuan University , Chengdu , 610041 China
| | - Linjie Li
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology, Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy , Sichuan University , Chengdu , 610041 China
| | - Tianbao Hu
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology, Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy , Sichuan University , Chengdu , 610041 China
| | - Lu Gao
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology, Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy , Sichuan University , Chengdu , 610041 China
| | - Zhenlei Song
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology, Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy , Sichuan University , Chengdu , 610041 China.,State Key Laboratory of Elemento-organic Chemistry , Nankai University , Tianjin , 300071 China
| |
Collapse
|
18
|
O'Brien KT, Smith AB. Merging Asymmetric [1,2]-Additions of Lithium Acetylides to Carbonyls with Type II Anion Relay Chemistry. Org Lett 2019; 21:7655-7659. [PMID: 31498641 DOI: 10.1021/acs.orglett.9b02959] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An enantioselective three-component coupling reaction has been developed, enabling the union of a variety of lithium acetylides and electrophiles exploiting an achiral linchpin via an anionic reaction cascade. This Type II Anion Relay Chemistry tactic is initiated via an enantioselective [1,2]-carbonyl addition exploiting BINOL catalysis to access an enantioenriched alkoxide intermediate. Migration of charge across the linchpin via a [1,4]-Brook rearrangement with electrophile capture affords a three-component propargyl ether adduct. Herein, we report the development, scope, and limitations of this reaction sequence.
Collapse
Affiliation(s)
- Kevin T O'Brien
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104 , United States
| | - Amos B Smith
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104 , United States
| |
Collapse
|
19
|
|
20
|
Tian Y, Wang J, Liu W, Yuan X, Tang Y, Li J, Chen Y, Zhang W. Stereodivergent total synthesis of Br-nannocystins underpinning the polyketide (10R,11S) configuration as a key determinant of potency. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.12.107] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
21
|
Yamini V, Reddy KM, Krishna AS, Lakshmi JK, Ghosh S. Formal total synthesis of mandelalide A. J CHEM SCI 2019. [DOI: 10.1007/s12039-019-1600-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
|
22
|
Deng Y, Nguyen MD, Zou Y, Houk KN, Smith AB. Generation of Dithianyl and Dioxolanyl Radicals Using Photoredox Catalysis: Application in the Total Synthesis of the Danshenspiroketallactones via Radical Relay Chemistry. Org Lett 2019; 21:1708-1712. [PMID: 30807194 DOI: 10.1021/acs.orglett.9b00271] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Visible-light-induced generation of dithianyl and dioxolanyl radicals via selective hydrogen atom transfer (HAT) has been achieved. This radical relay tactic enables remote C(sp3)-H functionalization to permit rapid access to polyol and spiroketal segments, and in turn has been exploited as a key synthetic construct in the total synthesis of the danshenspiroketallactones. The conformational stability of the danshenspiroketallactones has also been defined via experiments and DFT calculations.
Collapse
Affiliation(s)
- Yifan Deng
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylavania 19104 , United States
| | - Minh D Nguyen
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylavania 19104 , United States
| | - Yike Zou
- Department of Chemistry and Biochemistry , University of California, Los Angeles , 607 Charles E. Young Drive East , Los Angeles , California 90095 , United States
| | - K N Houk
- Department of Chemistry and Biochemistry , University of California, Los Angeles , 607 Charles E. Young Drive East , Los Angeles , California 90095 , United States
| | - Amos B Smith
- Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylavania 19104 , United States
| |
Collapse
|
23
|
Guchhait S, Goswami RK. Studies toward the synthesis of macrotermycin C: stereoselective construction of the acyclic skeleton of the aglycon. Org Biomol Chem 2019; 17:9502-9509. [DOI: 10.1039/c9ob01999e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first asymmetric synthesis of the acyclic skeleton of the aglycon of macrotermycin C has been achieved in 17 linear steps with 5.7% overall yield following a convergent approach.
Collapse
Affiliation(s)
- Sandip Guchhait
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Rajib Kumar Goswami
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| |
Collapse
|
24
|
Dubbu S, Bardhan A, Chennaiah A, Vankar YD. A Cascade of Prins Reaction and Pinacol-Type Rearrangement: Access to 2,3-Dideoxy-3C-Formyl β-C
-Aryl/Alkyl Furanosides and 2-Deoxy-2C-Branched β-C
-Aryl Furanoside. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Sateesh Dubbu
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| | - Anirban Bardhan
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| | - Ande Chennaiah
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| | - Yashwant D. Vankar
- Department of Chemistry; Indian Institute of Technology Kanpur; 208016 Kanpur India
| |
Collapse
|
25
|
Trost BM, Bai WJ, Stivala CE, Hohn C, Poock C, Heinrich M, Xu S, Rey J. Enantioselective Synthesis of des-Epoxy-Amphidinolide N. J Am Chem Soc 2018; 140:17316-17326. [DOI: 10.1021/jacs.8b11827] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Wen-Ju Bai
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Craig E. Stivala
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Christoph Hohn
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Caroline Poock
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Marc Heinrich
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Shiyan Xu
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Jullien Rey
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| |
Collapse
|
26
|
Zhu G, Yi Z, Zhou J, Chen Z, Guo P, Huang Y, Chen J, Song H, Yi W. Bran-New Four-Molecule and Five-Molecule Cascade Reactions for One-Pot Synthesis of Pyrano[3,2- c]chromen-5-ones and Spiro[benzo[ b][1,4]diazepine-2,2'-pyrano[3,2- c]chromen]-5'-ones under Catalyst- and Solvent-Free Conditions. ACS OMEGA 2018; 3:13494-13502. [PMID: 30411041 PMCID: PMC6217645 DOI: 10.1021/acsomega.7b02017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 03/01/2018] [Indexed: 05/10/2023]
Abstract
Herein, two versatile bran-new methods have been developed for building three new kinds of complicated-framework compounds including 2,4,4-trimethyl-2-(phenylamino)-3,4-dihydro-2H,5H-pyrano[3,2-c]chromen-5-ones, 4,4,4',4'-tetramethyl-1,3,3',4,4',5-hexahydro-5'H-spiro-[benzo[b][1,4]diazepine-2,2'-pyrano[3,2-c]-chromen]-5'-ones, and 2,2,4',4'-tetramethyl-2,3,3',4'-tetrahydro-5H,5'H-spiro[benzo[b][1,4]-oxazepine-4,2'-pyrano[3,2-c]chromen]-5'-ones in a one-pot manner via four-molecule and five-molecule cascade reactions of commercially available 4-hydroxychromen-2-one, substituted anilines, and acetone. In consideration of these impressive features including no need of additional catalysts and solvents, moderate to good yields, excellent site-selectivity, and broad substrate/functional group tolerance, we believe that the two present protocols should have the potential for broad synthetic utility.
Collapse
Affiliation(s)
- Guoxun Zhu
- School
of Chemical Engineering and Technology, Sun Yat-sen University, 135 Xin Gang West Road, Guangzhou 510275, P. R. China
| | - Zhou Yi
- School
of Chemical Engineering and Technology, Sun Yat-sen University, 135 Xin Gang West Road, Guangzhou 510275, P. R. China
| | - Jie Zhou
- School
of Chemical Engineering and Technology, Sun Yat-sen University, 135 Xin Gang West Road, Guangzhou 510275, P. R. China
| | - Zhiyong Chen
- China
National Analysis Center, Guangzhou 510070, P. R. China
| | - Pengran Guo
- China
National Analysis Center, Guangzhou 510070, P. R. China
| | - Yanying Huang
- China
National Analysis Center, Guangzhou 510070, P. R. China
| | - Jianghan Chen
- China
National Analysis Center, Guangzhou 510070, P. R. China
| | - Huacan Song
- School
of Chemical Engineering and Technology, Sun Yat-sen University, 135 Xin Gang West Road, Guangzhou 510275, P. R. China
- E-mail: . Tel: +86-20-84110918.
Fax: +86-20-84112245 (H.S.)
| | - Wei Yi
- School
of Chemical Engineering and Technology, Sun Yat-sen University, 135 Xin Gang West Road, Guangzhou 510275, P. R. China
- Key
Laboratory of Molecular Clinical Pharmacology & Fifth Affiliated
Hospital, Guangzhou Medical University, Guangzhou 511436, P. R. China
- E-mail: . Tel: +86-20-37104196. Fax: +86-20-37104196 (W.Y.)
| |
Collapse
|
27
|
Liang X, Wu C, Zheng Z, Walsh PJ. Nickel-Catalyzed Oxidative Coupling Reaction of Phenyl Benzyl Sulfoxides. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00476] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Xiaoxia Liang
- Natural Medicine Research Center, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, PR China
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Chen Wu
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Zhipeng Zheng
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| |
Collapse
|
28
|
Allegre KM, Brennan N, Tunge JA. Synthesis of Vinyl Cyclopropanes via Anion Relay Cyclization. Org Lett 2018; 20:4191-4194. [PMID: 29956937 DOI: 10.1021/acs.orglett.8b01566] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A method where an allyl alcohol is formed from a Tsuji-Trost allylation between a vinyl epoxide and an acyl containing nucleophile is described. Subsequently, a retro-Claisen condensation is utilized as a means of through-space anion relay. The anion relay results in the formation of a reactive carbanion and simultaneously activates an allylic alcohol toward intramolecular Tsuji-Trost cyclopropanation. Hence, in one pot, Tsuji-Trost allylation, retro-Claisen activation, and Tsuji-Trost cyclopropanation are combined to access synthetically useful vinyl cyclopropanes from vinyl epoxides using a mild and operationally simple procedure.
Collapse
Affiliation(s)
- Kevin M Allegre
- Department of Chemistry , The University of Kansas , 2010 Malott Hall, 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| | - Nathan Brennan
- Department of Chemistry , The University of Kansas , 2010 Malott Hall, 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| | - Jon A Tunge
- Department of Chemistry , The University of Kansas , 2010 Malott Hall, 1251 Wescoe Hall Drive , Lawrence , Kansas 66045 , United States
| |
Collapse
|
29
|
Zeng J, Liu Y, Chen W, Zhao X, Meng L, Wan Q. Glycosyl Sulfoxides in Glycosylation Reactions. Top Curr Chem (Cham) 2018; 376:27. [DOI: 10.1007/s41061-018-0205-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 05/31/2018] [Indexed: 01/01/2023]
|
30
|
Dyer LA, Philbin CS, Ochsenrider KM, Richards LA, Massad TJ, Smilanich AM, Forister ML, Parchman TL, Galland LM, Hurtado PJ, Espeset AE, Glassmire AE, Harrison JG, Mo C, Yoon S, Pardikes NA, Muchoney ND, Jahner JP, Slinn HL, Shelef O, Dodson CD, Kato MJ, Yamaguchi LF, Jeffrey CS. Modern approaches to study plant–insect interactions in chemical ecology. Nat Rev Chem 2018. [DOI: 10.1038/s41570-018-0009-7] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
31
|
Ai Y, Kozytska MV, Zou Y, Khartulyari AS, Maio WA, Smith AB. Total Synthesis of the Marine Phosphomacrolide, (-)-Enigmazole A, Exploiting Multicomponent Type I Anion Relay Chemistry (ARC) in Conjunction with a Late-Stage Petasis-Ferrier Union/Rearrangement. J Org Chem 2018; 83:6110-6126. [PMID: 29786446 DOI: 10.1021/acs.joc.8b00899] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An effective late-stage large-fragment union/rearrangement exploiting the Petasis-Ferrier protocol, in conjunction with multicomponent Type I Anion Relay Chemistry (ARC) to access advanced intermediates, permits completion of a convergent, stereocontrolled total synthesis of the architecturally complex phosphomacrolide (-)-enigmazole A (1).
Collapse
Affiliation(s)
- Yanran Ai
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Mariya V Kozytska
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Yike Zou
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Anton S Khartulyari
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - William A Maio
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Amos B Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| |
Collapse
|
32
|
Dong HR, Wu JG. Design, synthesis and anticancer activity evaluation of aziridine-1,2,3-triazole hybrid derivatives. HETEROCYCL COMMUN 2018. [DOI: 10.1515/hc-2017-0144] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
AbstractNew 1-aryl-4-[(aziridine-1-yl)diarylmethyl]-5-methyl-1H-1,2,3-triazole derivatives7a–iwere synthesized by a one-pot reaction of diaryl-(1-aryl-5-methyl-1H-1,2,3-triazol-4-yl)methanols6a–iderived from 1-aryl-5-methyl-1H-1,2,3-triazole-4-carboxylic acids4a–c. Structures of compounds7a–iwere confirmed by analysis of proton nuclear magnetic resonance (1H NMR) and carbon-13 nuclear magnetic resonance (13C NMR), mass spectrometry (MS) and infrared (IR) data. The structure of compound7fwas studied by X-ray diffraction analysis. The anticancer activities of compounds7a–iagainst human leukemia HL-60 cells and human hepatoma G2 cells were evaluated. Some of the compounds are highly active.
Collapse
|
33
|
Nguyen MH, Imanishi M, Kurogi T, Wan X, Ishmael JE, McPhail KL, Smith AB. Synthetic Access to the Mandelalide Family of Macrolides: Development of an Anion Relay Chemistry Strategy. J Org Chem 2018; 83:4287-4306. [PMID: 29480727 PMCID: PMC5910188 DOI: 10.1021/acs.joc.8b00268] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The mandelalides comprise a family of structurally complex marine macrolides that display significant cytotoxicity against several human cancer cell lines. Presented here is a full account on the development of an Anion Relay Chemistry (ARC) strategy for the total synthesis of (-)-mandelalides A and L, the two most potent members of the mandelalide family. The design and implementation of a three-component type II ARC/cross-coupling protocol and a four-component type I ARC union permits rapid access respectively to the key tetrahydrofuran and tetrahydropyran structural motifs of these natural products. Other highlights of the synthesis include an osmium-catalyzed oxidative cyclization of an allylic 1,3-diol, a mild Yamaguchi esterification to unite the northern and southern hemispheres, and a late-stage Heck macrocyclization. Synthetic mandelalides A and L displayed potent cytotoxicity against human HeLa cervical cancer cells (EC50, 1.3 and 3.1 nM, respectively). This synthetic approach also provides access to several highly potent non-natural mandelalide analogs, including a biotin-tagged mandelalide probe for future biological investigation.
Collapse
Affiliation(s)
- Minh H. Nguyen
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Masashi Imanishi
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Taichi Kurogi
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, United States
| | - Xuemei Wan
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, OR 97331, United States
| | - Jane E. Ishmael
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, OR 97331, United States
| | - Kerry L. McPhail
- Department of Pharmaceutical Sciences, Oregon State University, Corvallis, OR 97331, United States
| | - Amos B. Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, United States
| |
Collapse
|
34
|
Dong J, Bao L, Hu Z, Ma S, Zhou X, Hao M, Li N, Xu X. Anion Relay Enabled [3 + 3]-Annulation of Active Methylene Isocyanides and Ene-Yne-Ketones. Org Lett 2018; 20:1244-1247. [DOI: 10.1021/acs.orglett.8b00186] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jinhuan Dong
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Lan Bao
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Zhongyan Hu
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Shenghua Ma
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Xinyi Zhou
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Mengru Hao
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Ni Li
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| | - Xianxiu Xu
- College of Chemistry, Chemical
Engineering and Materials Science, Collaborative Innovation Center
of Functionalized Probes for Chemical Imaging in Universities of Shandong,
Key Laboratory of Molecular and Nano Probes, Ministry of Education,
Institute of Molecular and Nano Science, Shandong Normal University, Jinan 250014, China
| |
Collapse
|
35
|
The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2016. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.09.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
36
|
Vale JR, Rimpiläinen T, Sievänen E, Rissanen K, Afonso CAM, Candeias NR. Pot-Economy Autooxidative Condensation of 2-Aryl-2-lithio-1,3-dithianes. J Org Chem 2018; 83:1948-1958. [PMID: 29334462 PMCID: PMC6150673 DOI: 10.1021/acs.joc.7b02896] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The autoxidative condensation of 2-aryl-2-lithio-1,3-dithianes is here reported. Treatment of 2-aryl-1,3-dithianes with n-BuLi in the absence of any electrophile leads to condensation of three molecules of 1,3-dithianes and formation of highly functionalized α-thioether ketones orthothioesters in 51-89% yields upon air exposure. The method was further expanded to benzaldehyde dithioacetals, affording corresponding orthothioesters and α-thioether ketones in 48-97% yields. The experimental results combined with density functional theory studies support a mechanism triggered by the autoxidation of 2-aryl-2-lithio-1,3-dithianes to yield a highly reactive thioester that undergoes condensation with two other molecules of 2-aryl-2-lithio-1,3-dithiane.
Collapse
Affiliation(s)
- João R Vale
- Laboratory of Chemistry and Bioengineering, Tampere University of Technology , Korkeakoulunkatu 8, 33101 Tampere, Finland.,Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa , Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Tatu Rimpiläinen
- Laboratory of Chemistry and Bioengineering, Tampere University of Technology , Korkeakoulunkatu 8, 33101 Tampere, Finland
| | - Elina Sievänen
- University of Jyvaskyla , Department of Chemistry, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Kari Rissanen
- University of Jyvaskyla , Department of Chemistry, Nanoscience Center, P.O. Box 35, 40014 Jyväskylä, Finland
| | - Carlos A M Afonso
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa , Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Nuno R Candeias
- Laboratory of Chemistry and Bioengineering, Tampere University of Technology , Korkeakoulunkatu 8, 33101 Tampere, Finland
| |
Collapse
|
37
|
Abstract
Covering: 2016. Previous review: Nat. Prod. Rep., 2017, 34, 235-294This review covers the literature published in 2016 for marine natural products (MNPs), with 757 citations (643 for the period January to December 2016) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1277 in 432 papers for 2016), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that led to the revision of structures or stereochemistries, have been included.
Collapse
Affiliation(s)
- John W Blunt
- School of Physical and Chemical Sciences, University of Canterbury, Christchurch, New Zealand
| | | | | | | | | | | |
Collapse
|
38
|
Kuilya TK, Das S, Saha D, Goswami RK. Studies toward the synthesis of strevertenes A and G: stereoselective construction of C1–C19segments of the molecules. Org Biomol Chem 2018; 16:7595-7608. [DOI: 10.1039/c8ob01754a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient route for the stereoselective synthesis of common C1–C19segment of strevertenes A and G has been developed.
Collapse
Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Subhendu Das
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Dhiman Saha
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| |
Collapse
|
39
|
Pu Q, Tang X, Gao L, Song Z. Three-component reaction to synthesize E-vinyl silyl anti-1,2-diols via sequential [1,4]-O-to-O/[1,4]-C-to-O silyl migrations. Org Chem Front 2018. [DOI: 10.1039/c8qo00332g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A three-component reaction of geminal bis(silyl) allyl silyl ether, aldehyde and electrophile has been developed to synthesize trisubstituted E-vinyl silyl anti-1,2-diols. The approach features a sequential [1,4]-O-to-O/[1,4]-C-to-O silyl migrations process.
Collapse
Affiliation(s)
- Qiang Pu
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu
| | - Xiaoxiao Tang
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu
| | - Lu Gao
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu
| | - Zhenlei Song
- Sichuan Engineering Laboratory for Plant-Sourced Drug and Research Center for Drug Industrial Technology
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry
- West China School of Pharmacy
- Sichuan University
- Chengdu
| |
Collapse
|
40
|
Xiao P, Tang Z, Wang K, Chen H, Guo Q, Chu Y, Gao L, Song Z. Chemoselective Reduction of Sterically Demanding N,N-Diisopropylamides to Aldehydes. J Org Chem 2017; 83:1687-1700. [PMID: 29239185 DOI: 10.1021/acs.joc.7b02868] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Peihong Xiao
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Zhixing Tang
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Kai Wang
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Hua Chen
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Qianyou Guo
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Yang Chu
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Lu Gao
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
| | - Zhenlei Song
- Key
Laboratory of Drug-Targeting of Education Ministry and Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610064, P. R. China
- State
Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, P. R. China
| |
Collapse
|
41
|
Increased Biosynthetic Gene Dosage in a Genome-Reduced Defensive Bacterial Symbiont. mSystems 2017; 2:mSystems00096-17. [PMID: 29181447 PMCID: PMC5698493 DOI: 10.1128/msystems.00096-17] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 10/18/2017] [Indexed: 12/31/2022] Open
Abstract
Secondary metabolites, which are small-molecule organic compounds produced by living organisms, provide or inspire drugs for many different diseases. These natural products have evolved over millions of years to provide a survival benefit to the producing organism and often display potent biological activity with important therapeutic applications. For instance, defensive compounds in the environment may be cytotoxic to eukaryotic cells, a property exploitable for cancer treatment. Here, we describe the genome of an uncultured symbiotic bacterium that makes such a cytotoxic metabolite. This symbiont is losing genes that do not endow a selective advantage in a hospitable host environment. Secondary metabolism genes, however, are repeated multiple times in the genome, directly demonstrating their selective advantage. This finding shows the strength of selective forces in symbiotic relationships and suggests that uncultured bacteria in such relationships should be targeted for drug discovery efforts. A symbiotic lifestyle frequently results in genome reduction in bacteria; the isolation of small populations promotes genetic drift and the fixation of deletions and deleterious mutations over time. Transitions in lifestyle, including host restriction or adaptation to an intracellular habitat, are thought to precipitate a wave of sequence degradation events and consequent proliferation of pseudogenes. We describe here a verrucomicrobial symbiont of the tunicate Lissoclinum sp. that appears to be undergoing such a transition, with low coding density and many identifiable pseudogenes. However, despite the overall drive toward genome reduction, this symbiont maintains seven copies of a large polyketide synthase (PKS) pathway for the mandelalides (mnd), cytotoxic compounds that likely constitute a chemical defense for the host. There is evidence of ongoing degradation in a small number of these repeats—including variable borders, internal deletions, and single nucleotide polymorphisms (SNPs). However, the gene dosage of most of the pathway is increased at least 5-fold. Correspondingly, this single pathway accounts for 19% of the genome by length and 25.8% of the coding capacity. This increased gene dosage in the face of generalized sequence degradation and genome reduction suggests that mnd genes are under strong purifying selection and are important to the symbiotic relationship. IMPORTANCE Secondary metabolites, which are small-molecule organic compounds produced by living organisms, provide or inspire drugs for many different diseases. These natural products have evolved over millions of years to provide a survival benefit to the producing organism and often display potent biological activity with important therapeutic applications. For instance, defensive compounds in the environment may be cytotoxic to eukaryotic cells, a property exploitable for cancer treatment. Here, we describe the genome of an uncultured symbiotic bacterium that makes such a cytotoxic metabolite. This symbiont is losing genes that do not endow a selective advantage in a hospitable host environment. Secondary metabolism genes, however, are repeated multiple times in the genome, directly demonstrating their selective advantage. This finding shows the strength of selective forces in symbiotic relationships and suggests that uncultured bacteria in such relationships should be targeted for drug discovery efforts. Author Video: An author video summary of this article is available.
Collapse
|
42
|
Montgomery TD, Smith AB. α-Silyl Amides: Effective Bifunctional Lynchpins for Type I Anion Relay Chemistry. Org Lett 2017; 19:6216-6219. [PMID: 29120188 PMCID: PMC5712993 DOI: 10.1021/acs.orglett.7b03142] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lynchpins comprising α-silyl amides have been validated for type I anion relay chemistry (ARC) to permit ready access to γ-ketoamides. Importantly, the ARC protocol can be run at ambient temperature without the need of additional reagents to trigger the [1,4] Brook rearrangement.
Collapse
|
43
|
Zhu L, Yuan H, Zhang J. Mechanistic investigation on N → C α → O relay via non-Brook rearrangement: reaction conditions promote synthesis of furo[3,2-c]pyridinones. Org Biomol Chem 2017; 15:9127-9138. [PMID: 29051939 DOI: 10.1039/c7ob02081c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A comprehensive density functional theory investigation was employed to disclose the effect of reaction conditions on the mechanism and effective anion relay sequence of a NaH promoted non-Brook rearrangement of benzaldehyde and 1-cinnamoylcyclopropanecarboxamides. Two main mechanisms were explored under four different reaction conditions: Na+-assisted and nH2O-Na+, 2H2O-DMSO-Na+, and Na+-DMSO co-assisted, and the difference relies on the reaction sequence between the concerted ring-opening and recyclization and electrophilic addition. Being different from previous reports, a cooperative participation of water, solvent DMSO and counterion Na+ is revealed in the preferential mechanism. The preferred scenario undergoes five major steps: deprotonation, aza-Michael addition, electrophilic addition, NaOH elimination and a concerted ring-opening and recyclization step. The rate-determining step is the concerted ring-opening and recyclization process with an energy barrier of 30.2 kcal mol-1. We found that the effective anion relay of a non-Brook rearrangement order is N → Cα → O rather than the previously proposed aza-oxy-carbanion. Meanwhile, a mixed type of ARC chemistry through a novel non-Brook rearrangement was disclosed. Moreover, the non-covalent interactions between substrate and reactant extensively affect the anion relay process by hydrogen-bonding (O-HO and C-HO) and electrostatic (Na+O) interactions. Thus, our results provide insightful clues to the mechanism of the reaction condition catalyzed non-Brook rearrangement reaction.
Collapse
Affiliation(s)
- Lihan Zhu
- Faculty of Chemistry, Northeast Normal University, Changchun 130024, China.
| | | | | |
Collapse
|
44
|
Han H, Smith AB. Anion Relay Chemistry: Development of an Effective Diastereoselective [3+2] Annulation Tactic Exploiting an Aldol/Brook Rearrangement/Cyclization Cascade. Angew Chem Int Ed Engl 2017; 56:14102-14106. [PMID: 29024282 DOI: 10.1002/anie.201708017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Indexed: 11/09/2022]
Abstract
An effective [3+2] annulation tactic for the construction of diverse bicyclic compounds possessing highly functionalized cyclopentane rings has been developed employing soft ketone enolates as the initial nucleophile for anion relay chemistry (ARC). The protocol entails a highly diastereoselective aldol/Brook rearrangement/cyclization cascade.
Collapse
Affiliation(s)
- Heeoon Han
- Department of Chemistry, University of Pennsylvania, 231 S. 34th street, Philadelphia, PA, 19104, USA
| | - Amos B Smith
- Department of Chemistry, University of Pennsylvania, 231 S. 34th street, Philadelphia, PA, 19104, USA
| |
Collapse
|
45
|
Han H, Smith AB. Anion Relay Chemistry: Development of an Effective Diastereoselective [3+2] Annulation Tactic Exploiting an Aldol/Brook Rearrangement/Cyclization Cascade. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Heeoon Han
- Department of Chemistry; University of Pennsylvania; 231 S. 34th street Philadelphia PA 19104 USA
| | - Amos B. Smith
- Department of Chemistry; University of Pennsylvania; 231 S. 34th street Philadelphia PA 19104 USA
| |
Collapse
|
46
|
Nguyen MH, O'Brien KT, Smith AB. Design, Synthesis, and Application of Polymer-Supported Silicon-Transfer Agents for Cross-Coupling Reactions with Organolithium Reagents. J Org Chem 2017; 82:11056-11071. [PMID: 28931273 DOI: 10.1021/acs.joc.7b02004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The initial design, synthesis, and validation of polymer-supported siloxane transfer agents have been achieved that permit the direct use of organolithium reagents in the palladium-catalyzed cross-coupling reactions. Through rational design, two generations of polymer support were developed that significantly simplify product purification and the transfer agent recycling.
Collapse
Affiliation(s)
- Minh H Nguyen
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | - Kevin T O'Brien
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | - Amos B Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|
47
|
Nazari M, Serrill JD, Wan X, Nguyen MH, Anklin C, Gallegos DA, Smith AB, Ishmael JE, McPhail KL. New Mandelalides Expand a Macrolide Series of Mitochondrial Inhibitors. J Med Chem 2017; 60:7850-7862. [PMID: 28841379 DOI: 10.1021/acs.jmedchem.7b00990] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Mandelalides A-D (1-4) are macrocyclic polyketides known to have an unusual bioactivity profile influenced by compound glycosylation and growth phase of cultured cells. The isolation and characterization of additional natural congeners, mandelalides E-L (5-12), and the supply of synthetic compounds 1 and 12, as well as seco-mandelalide A methyl ester (13), have now facilitated mechanism of action and structure-activity relationship studies. Glycosylated mandelalides are effective inhibitors of aerobic respiration in living cells. Macrolides 1 and 2 inhibit mitochondrial function similar to oligomycin A and apoptolidin A, selective inhibitors of the mammalian ATP synthase (complex V). 1 inhibits ATP synthase activity from isolated mitochondria and triggers caspase-dependent apoptosis in HeLa cells, which are more sensitive to inhibition by 1 in the presence of the glycolysis inhibitor 2-deoxyglucose. Thus, mandelalide cytotoxicity depends on basal metabolic phenotype; cells with an oxidative phenotype are most likely to be inhibited by the mandelalides.
Collapse
Affiliation(s)
- Mohamad Nazari
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University , Corvallis, Oregon 97331, United States
| | - Jeffrey D Serrill
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University , Corvallis, Oregon 97331, United States
| | - Xuemei Wan
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University , Corvallis, Oregon 97331, United States
| | - Minh H Nguyen
- Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104-6323, United States
| | - Clemens Anklin
- Bruker BioSpin , 15 Fortune Drive, Billerica, Massachusetts 01821, United States
| | - David A Gallegos
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University , Corvallis, Oregon 97331, United States
| | - Amos B Smith
- Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104-6323, United States
| | - Jane E Ishmael
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University , Corvallis, Oregon 97331, United States
| | - Kerry L McPhail
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University , Corvallis, Oregon 97331, United States
| |
Collapse
|
48
|
Zhang H, Ma S, Yuan Z, Chen P, Xie X, Wang X, She X. Palladium-Promoted Neutral 1,4-Brook Rearrangement/Intramolecular Allylic Cyclization Cascade Reaction: A Strategy for the Construction of Vinyl Cyclobutanols. Org Lett 2017; 19:3478-3481. [PMID: 28598159 DOI: 10.1021/acs.orglett.7b01381] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A cascade reaction to build vinyl cyclobutanol rings through activation of vinyl epoxides by palladium, followed by 1,4-Brook rearrangement and intramolecular cyclization with a palladium complex of the resulting carbon anion, is described. Through this cascade reaction, several highly substituted cyclobutanol substrates were achieved in good yields with high stereoselectivities.
Collapse
Affiliation(s)
- Hao Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China
| | - Shiqiang Ma
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China
| | - Ziyun Yuan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China
| | - Peng Chen
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China
| | - Xingang Xie
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China
| | - Xiaolei Wang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China
| | - Xuegong She
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , 222 TianShui South Road, Lanzhou 730000, China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
| |
Collapse
|
49
|
Paul D, Das S, Goswami RK. Total Synthesis of Pestalotioprolide G and Putative Structure of Pestalotioprolide H. J Org Chem 2017; 82:7437-7445. [DOI: 10.1021/acs.joc.7b01115] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Debobrata Paul
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sayantan Das
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| |
Collapse
|
50
|
Liu Q, Chen Y, Zhang X, Houk KN, Liang Y, Smith AB. Type II Anion Relay Chemistry: Conformational Constraints To Achieve Effective [1,5]-Vinyl Brook Rearrangements. J Am Chem Soc 2017; 139:8710-8717. [PMID: 28613847 DOI: 10.1021/jacs.7b04149] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The design, synthesis, and evaluation of bifunctional linchpins, conformationally anchored on six-membered rings to achieve efficient [1,5]-Brook rearrangements involving vinyl silanes have been achieved. The restrained linchpins were subsequently exploited in type II anion relay chemistry (ARC) to permit both alkylations and Pd-mediated cross-coupling reactions (CCR) of sp2 stabilized carbanions. DFT calculations were then employed to understand the mechanism and reactivity trends of [1,4]- and [1,5]-vinyl Brook rearrangements to provide insight on the role of the required copper reagent and the substrate geometry.
Collapse
Affiliation(s)
- Qi Liu
- Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| | - Yu Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, China
| | - Xiao Zhang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, China
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California , Los Angeles, California 90095, United States
| | - Yong Liang
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210023, China
| | - Amos B Smith
- Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
| |
Collapse
|