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Pazur EJ, Wipf P. Recent syntheses and biological profiling of quassinoids. Org Biomol Chem 2022; 20:3870-3889. [PMID: 35506992 DOI: 10.1039/d2ob00490a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Quassinoid natural products have gained considerable recognition for their diverse biological properties and their synthetically challenging, highly oxygenated polycyclic structures. Herein, we discuss strategies and tactics in the total synthesis of quassinoids that have been evolving over the past 15 years. Additionally, recent structure-activity relationships and potential biological mechanisms of actions are briefly summarized.
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Affiliation(s)
- Ethan J Pazur
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA.,School of Pharmacy, University of Eastern Finland, FI-70210 Kuopio, Finland
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2
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Wang R, Fan RZ, Ni FQ, Sang J, Xie XL, Luo SY, Tang GH, Yin S. 19- nor-, 20- nor-, and tetranor-Halimane-Type Furanoditerpenoids from Croton crassifolius. JOURNAL OF NATURAL PRODUCTS 2020; 83:255-267. [PMID: 32003565 DOI: 10.1021/acs.jnatprod.9b00634] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The phytochemical investigation of the roots of Croton crassifolius led to the isolation of 16 new halimane furanoditerpenoids, crohalifuranes A-P (1-16), along with 15 known analogues, 17-31. The new structures including their absolute configurations were elucidated by NMR and MS data analysis, comparison of experimental and calculated electronic circular dichroism data, single-crystal X-ray diffraction data, and chemical methods. Crohalifuranes A (1) and B (2) are tetranor- and 19-nor-halimane diterpenoids featuring a rare decahydroacenaphthene core, respectively, which might be derived from the accompanying crassifoliusin A by loss of the furan ring or the C-19 substituent. Crohalifurane C (3) represents the first example of a 20-nor-halimane diterpenoid, and crohalifurane D (4) is characterized by an unusual 6,20-δ-lactone moiety. All compounds were examined for their inhibitory effects on nitric oxide (NO) production induced by lipopolysaccharide in RAW264.7 cells, and 2 and 23 exhibited moderate inhibition on NO production with IC50 values of 17.2 ± 1.3 and 23.7 ± 1.4 μM, respectively.
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Affiliation(s)
- Rong Wang
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Run-Zhu Fan
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Fu-Qiang Ni
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Jun Sang
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Xing-Lin Xie
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Si-Yuan Luo
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Gui-Hua Tang
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
| | - Sheng Yin
- School of Pharmaceutical Sciences , Sun Yat-sen University , Guangzhou 510006 , People's Republic of China
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3
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Kotha S, Cheekatla SR, Meshram M, Bandi V, Seema V. Realization of Photo‐Thermal Metathesis Under Microwave Irradiation Conditions: An Entry to Triquinane Frameworks. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900432] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of ChemistryIndian Institute of Technology Bombay Mumbai Powai India-400076 India
| | - Subba Rao Cheekatla
- Department of ChemistryIndian Institute of Technology Bombay Mumbai Powai India-400076 India
| | - Milind Meshram
- Department of ChemistryIndian Institute of Technology Bombay Mumbai Powai India-400076 India
| | - Vijayalakshmi Bandi
- Department of ChemistryIndian Institute of Technology Bombay Mumbai Powai India-400076 India
| | - Vittal Seema
- Department of ChemistryIndian Institute of Technology Bombay Mumbai Powai India-400076 India
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Tobal IE, Roncero AM, Moro RF, Díez D, Marcos IS. The Methylene-Cycloalkylacetate (MCA) Scaffold in Terpenyl Compounds with Potential Pharmacological Activities. Molecules 2019; 24:molecules24112120. [PMID: 31195609 PMCID: PMC6600407 DOI: 10.3390/molecules24112120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/03/2019] [Accepted: 06/03/2019] [Indexed: 01/30/2023] Open
Abstract
Recently, the methylene-cycloakylacetate (MCA) scaffold has been reported as a potential pharmacophore for neurite outgrowth activity. In this work, natural diterpenes that embed MCA fragments are reviewed, as they are major components of Halimium viscosum: ent-halimic acid, the prototype for these bioactive compounds. Herein, structures, sources, and activities for the natural diterpenes, as well as their synthetic derivatives of interest, are reviewed.
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Affiliation(s)
- Ignacio E Tobal
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Salamanca. Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - Alejandro M Roncero
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Salamanca. Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - Rosalina F Moro
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Salamanca. Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - David Díez
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Salamanca. Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
| | - Isidro S Marcos
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Salamanca. Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
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Zhang ZX, Li HH, Zhi DJ, Wu PQ, Hu QL, Yu YF, Zhao Y, Yu CX, Fei DQ. Norcrocrassinone: A novel tetranorditerpenoid possessing a 6/6/5 fused ring system from Croton crassifolius. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.060] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Lankri D, Haham D, Lahiani A, Lazarovici P, Tsvelikhovsky D. Methylene-Cycloalkylacetate (MCA) Scaffold-Based Compounds as Novel Neurotropic Agents. ACS Chem Neurosci 2018; 9:691-698. [PMID: 29265805 DOI: 10.1021/acschemneuro.7b00473] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
One of the main symptoms in degenerative diseases is death of neuronal cell followed by the loss of neuronal pathways. In neuronal cultures, neurite outgrowths are cell sprouts capable of transforming into either axons or dendrites, to further form functional neuronal synaptic connections. Such connections have an important role in brain cognition, neuronal plasticity, neuronal survival, and regeneration. Therefore, drugs that stimulate neurite outgrowth may be found beneficial in ameliorating neural degeneration. Here, we establish the existence of a unique family of methylene-cycloalkylacetate-based molecules (MCAs) that interface with neuronal cell properties and operate as acceptable pharmacophores for a novel neurotropic (neurite outgrowth inducing) lead compounds. Using an established PC12 cell bioassay, we investigated the neurotropic effect of methylene-cycloalkylacetate compounds by comparison to NGF, a known neurotropic factor. Micrographs of the cells were collected by using a light microscope camera, and digitized photographs were analyzed for compound-induced neurotropic activity using an NIH image protocol. The results indicate that the alkene element, integrated within the cycloalkylacetate core, is indispensable for neurotropic activity. The discovered lead compounds need further mechanistic investigation and may be improved toward development of a neurotropic drug.
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Affiliation(s)
- David Lankri
- School of Pharmacy, Institute for Drug Research, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Dikla Haham
- School of Pharmacy, Institute for Drug Research, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Adi Lahiani
- School of Pharmacy, Institute for Drug Research, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Philip Lazarovici
- School of Pharmacy, Institute for Drug Research, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Dmitry Tsvelikhovsky
- School of Pharmacy, Institute for Drug Research, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
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Roncero AM, Tobal IE, Moro RF, Díez D, Marcos IS. Halimane diterpenoids: sources, structures, nomenclature and biological activities. Nat Prod Rep 2018; 35:955-991. [DOI: 10.1039/c8np00016f] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Diterpenes with a halimane skeleton constitute a small group of natural products that can be biogenetically considered as being between labdane and clerodane diterpenoids.
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Affiliation(s)
- Alejandro M. Roncero
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad de Salamanca
- 37008 Salamanca
- Spain
| | - Ignacio E. Tobal
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad de Salamanca
- 37008 Salamanca
- Spain
| | - Rosalina F. Moro
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad de Salamanca
- 37008 Salamanca
- Spain
| | - David Díez
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad de Salamanca
- 37008 Salamanca
- Spain
| | - Isidro S. Marcos
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad de Salamanca
- 37008 Salamanca
- Spain
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A modular synthesis of tetracyclic meroterpenoid antibiotics. Nat Commun 2017; 8:2083. [PMID: 29234008 PMCID: PMC5727219 DOI: 10.1038/s41467-017-02061-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 11/02/2017] [Indexed: 11/08/2022] Open
Abstract
Stachyflin, aureol, smenoqualone, strongylin A, and cyclosmenospongine belong to a family of tetracyclic meroterpenoids, which, by nature of their unique molecular structures and various biological properties, have attracted synthetic and medicinal chemists alike. Despite their obvious biosynthetic relationship, only scattered reports on the synthesis and biological investigation of individual meroterpenoids have appeared so far. Herein, we report a highly modular synthetic strategy that enabled the synthesis of each of these natural products and 15 non-natural derivatives. The route employs an auxiliary-controlled Diels-Alder reaction to enable the enantioselective construction of the decalin subunit, which is connected to variously substituted arenes by either carbonyl addition chemistry or sterically demanding sp2-sp3 cross-coupling reactions. The selective installation of either the cis- or trans-decalin stereochemistry is accomplished by an acid-mediated cyclization/isomerization reaction. Biological profiling reveals that strongylin A and a simplified derivative thereof have potent antibiotic activity against methicillin-resistant Staphylococcus aureus.
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Lv L, Lu S, Chen Y, Li Z. Diastereoselective building up polycyclic tetrahydrofurans via tandem annulation of 1,n-enynes with aliphatic acids. Org Chem Front 2017. [DOI: 10.1039/c7qo00527j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A silver-catalyzed tandem annulation of aniline-linked 1,7-enynes with aliphatic acids has been reported. These synergistic tandem annulations allowed for the straightforward and efficient synthesis of various highly diastereoselective polycyclic tetrahydrofurans.
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Affiliation(s)
- Leiyang Lv
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
- The State Key Laboratory of Applied Organic Chemistry
| | - Shenglin Lu
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
| | - Yuanjin Chen
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
| | - Zhiping Li
- Department of Chemistry
- Renmin University of China
- Beijing 100872
- China
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Behera TK, Jarhad DB, Mobin SM, Singh V. Molecular complexity and diversity from aromatics. Intramolecular cycloaddition of cyclohexa-2,4-dienones and sigmatropic shift in excited state: a unified approach towards synthesis of polycyclic frameworks related to crotogoudin, conidiogenol, and crinipellins. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.07.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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