1
|
Tichvon C, Zviagin E, Surma Z, Nagorny P. Synthesis of Bufadienolide Cinobufagin via Late-Stage Singlet Oxygen Oxidation/Rearrangement Approach. Org Lett 2024; 26:2445-2450. [PMID: 38488174 PMCID: PMC10980571 DOI: 10.1021/acs.orglett.4c00625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2024]
Abstract
This manuscript describes a concise synthesis of cinobufagin, a natural steroid of the bufadienolide family, from readily available dehydroepiandrosterone (DHEA), as well as its α5-epimer derived from 3-epi-andosterone. This synthesis features expedient installation of the 17β-pyrone moiety with the 14β,15β-epoxide and the 16β-acetoxy group using a photochemical regioselective singlet oxygen [4 + 2] cycloaddition followed by CoTPP-promoted in situ endoperoxide rearrangement to provide a 14β,16β-bis-epoxide in 64% yield with a 1.6:1 d.r. This β,β-bis-epoxide intermediate was subsequently subjected to a regioselective scandium(III) trifluoromethanesulfonate catalyzed House-Meinwald rearrangement to establish the 17β-configuration. The synthesis of cinobufagin is achieved in 12 steps (LLS) and 7.6% overall yield, and we demonstrate that it could be used as a platform for the subsequent medicinal chemistry exploration of cinobufagin analogs such as cinobufagin 5α-epimer.
Collapse
Affiliation(s)
- Colin Tichvon
- Chemistry Department, University of Michigan, 930 N. University Ave. Ann Arbor, MI 48109
| | - Eugene Zviagin
- Chemistry Department, University of Michigan, 930 N. University Ave. Ann Arbor, MI 48109
| | - Zoey Surma
- Chemistry Department, University of Michigan, 930 N. University Ave. Ann Arbor, MI 48109
| | - Pavel Nagorny
- Chemistry Department, University of Michigan, 930 N. University Ave. Ann Arbor, MI 48109
| |
Collapse
|
2
|
Abstract
This article describes a concise synthesis of cardiotonic steroids oleandrigenin (7) and its subsequent elaboration into the natural product rhodexin B (2) from the readily available intermediate (8) that could be derived from the commercially available steroids testosterone or DHEA via three-step sequences. These studies feature an expedient installation of the β16-oxidation based on β14-hydroxyl-directed epoxidation and subsequent epoxide rearrangement. The following singlet oxygen oxidation of the C17 furan moiety provides access to oleandrigenin (7) in 12 steps (LLS) and a 3.1% overall yield from 8. The synthetic oleandrigenin (7) was successfully glycosylated with l-rhamnopyranoside-based donor 28 using a Pd(II)-catalyst, and the subsequent deprotection under acidic conditions provided cytotoxic natural product rhodexin B (2) in a 66% yield (two steps).
Collapse
Affiliation(s)
- Zachary Fejedelem
- Chemistry Department, University of Michigan, 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
| | - Nolan Carney
- Chemistry Department, University of Michigan, 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
| | - Pavel Nagorny
- Chemistry Department, University of Michigan, 930 N. University Avenue, Ann Arbor, Michigan 48109, United States
| |
Collapse
|
3
|
Kumar G, Shankar R. 2-Isoxazolines: A Synthetic and Medicinal Overview. ChemMedChem 2020; 16:430-447. [PMID: 33029886 DOI: 10.1002/cmdc.202000575] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 09/26/2020] [Indexed: 02/03/2023]
Abstract
Isoxazolines are nitrogen- and oxygen-containing five-membered heterocyclic scaffolds with extensive biological activities. This framework can be readily obtained in good to excellent yields through 1,3-dipolar cycloaddition between nitrones with alkynes or allenes, aryl/alkyl halides, alkynes, and oxaziridines under mild conditions. This scaffold has been an emerging area of interest for many researchers given their wide range of bioactivities. Herein we review synthetic strategies toward isoxazolines and the role these efforts have had in enhancing the biological activity of natural products and synthetic compounds such as antitubercular agents, COX-1 inhibitors, COX-2 inhibitors (e. g., valdecoxib), nicotinic receptor modulators, and MIF inhibitors. With a focus on efforts from 2010 onward, this review provides in-depth coverage of the design and biological evaluation of isoxazoline systems and their impact on various pathologies.
Collapse
Affiliation(s)
- Gulshan Kumar
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu Campus, Jammu, 180001, India.,Bio-organic Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu Campus, Jammu, 180001, India
| | - Ravi Shankar
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Integrative Medicine, Jammu Campus, Jammu, 180001, India.,Bio-organic Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu Campus, Jammu, 180001, India
| |
Collapse
|
4
|
Pei JP, Lv XJ, Peng CJ, Liu YK. Asymmetric organocatalytic multicomponent reactions for efficient construction of bicyclic compounds bearing bisacetal and isoxazolidine moieties. Chem Commun (Camb) 2020; 56:12765-12768. [PMID: 32966389 DOI: 10.1039/d0cc05099g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An organocatalytic multicomponent reaction of N-protected hydroxylamines, acrylaldehyde and acetal-containing enones was developed. Bisacetal-containing bicyclic isoxazolidine derivatives bearing four continuous stereocenters were formed with excellent stereoselectivities. A plausible reaction pathway was proposed based on 18O-labeling control experiments.
Collapse
Affiliation(s)
- Jun-Ping Pei
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.
| | | | | | | |
Collapse
|
5
|
Michalak M, Michalak K, Wicha J. The synthesis of cardenolide and bufadienolide aglycones, and related steroids bearing a heterocyclic subunit. Nat Prod Rep 2017; 34:361-410. [PMID: 28378871 DOI: 10.1039/c6np00107f] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Covering: early studies through to March 2016Cardenolides and bufadienolides constitute an attractive class of biologically active steroid derivatives which have been used for the treatment of heart disease in traditional remedies as well as in modern medicinal therapy. Due to their application as therapeutic agents and their unique molecular structures, bearing unsaturated 5- or 6-membered lactones (or other heterocycles) attached to the steroid core, cardio-active steroids have received great attention, which has intensified during the last decade, in the synthetic organic community. Advances in the field of cross-coupling reactions have provided a powerful tool for the attachment of lactone subunits to the steroid core. This current review covers a methodological analysis of synthetic efforts to cardenolide and bufadienolide aglycones. Special emphasis is given to cross-coupling reactions applied for the attachment of lactone subunits at sterically very hindered positions of the steroid core. The carefully selected partial and total syntheses of representative cardio-active steroids will also be presented to exemplify recent achievements (improvements) in the field.
Collapse
Affiliation(s)
- Michał Michalak
- Institute of Organic Chemistry, Polish Academy of Sciences, ul. Marcina Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | | | | |
Collapse
|
6
|
Simeonov SP, Nunes JPM, Guerra K, Kurteva VB, Afonso CAM. Synthesis of Chiral Cyclopentenones. Chem Rev 2016; 116:5744-893. [DOI: 10.1021/cr500504w] [Citation(s) in RCA: 159] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Svilen P. Simeonov
- Institute
of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str, bl.9, 1113 Sofia, Bulgaria
| | - João P. M. Nunes
- Department
of Chemistry, University College London, London WC1H 0AJ, United Kingdom
| | - Krassimira Guerra
- Research
Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Vanya B. Kurteva
- Institute
of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev str, bl.9, 1113 Sofia, Bulgaria
| | - Carlos A. M. Afonso
- Research
Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| |
Collapse
|
7
|
Isoxazole derivatives of alpha-pinene isomers: Synthesis, crystal structure, spectroscopic characterization (FT-IR/NMR/GC–MS) and DFT studies. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.11.079] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
8
|
Prajapti SK, Shrivastava S, Bihade U, Gupta AK, Naidu VGM, Banerjee UC, Babu BN. Synthesis and biological evaluation of novel Δ2-isoxazoline fused cyclopentane derivatives as potential antimicrobial and anticancer agents. MEDCHEMCOMM 2015. [DOI: 10.1039/c4md00525b] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel Δ2-isoxazoline fused cyclopentane derivatives have been synthesized and evaluated for their antimicrobial and anticancer activities.
Collapse
Affiliation(s)
- Santosh Kumar Prajapti
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Hyderabad 500037
- India
| | - Shweta Shrivastava
- Department of Pharmacology and Toxicology
- National Institute of Pharmaceutical Education and Research (NIPER)
- Hyderabad 500037
- India
| | - Umesh Bihade
- Department of Pharmaceutical Technology
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
| | - Ajay Kumar Gupta
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Hyderabad 500037
- India
| | - V. G. M. Naidu
- Department of Pharmacology and Toxicology
- National Institute of Pharmaceutical Education and Research (NIPER)
- Hyderabad 500037
- India
| | - Uttam Chand Banerjee
- Department of Pharmaceutical Technology
- National Institute of Pharmaceutical Education and Research (NIPER)
- S. A. S. Nagar
- India
| | - Bathini Nagendra Babu
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research (NIPER)
- Hyderabad 500037
- India
| |
Collapse
|
9
|
Majumdar S, Hossain J, Natarajan R, Banerjee AK, Maiti DK. Phthalate tethered strategy: carbohydrate nitrile oxide cycloaddition to 12–15 member chiral macrocycles with alkenyl chain length controlled orientation of bridged isoxazolines. RSC Adv 2015. [DOI: 10.1039/c5ra22436e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The highly selective synthesis of phthalate templated bridged sugar-based isoxazoline macrocyclic lactones is demonstrated through INOC with alkene.
Collapse
Affiliation(s)
- Swapan Majumdar
- Department of Chemistry
- Tripura University
- Suryamaninagar 799 022
- India
| | - Jewel Hossain
- Department of Chemistry
- Tripura University
- Suryamaninagar 799 022
- India
| | | | | | - Dilip K. Maiti
- Department of Chemistry
- University of Calcutta
- Kolkata-700009
- India
| |
Collapse
|
10
|
Fernández-Mateos A, Madrazo SE, Teijón PH, Clemente RR, González RR, González FS. Synthesis of the BCDE Molecular Fragment of Azadiradione Mediated by Titanocene(III). J Org Chem 2013; 78:9571-8. [DOI: 10.1021/jo401646g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Fernández-Mateos
- Departamento de Química
Orgánica, Facultad de CC Químicas, and ‡Servicio General
de Difracción de Rayos X, Facultad de Ciencias,Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - S. Encinas Madrazo
- Departamento de Química
Orgánica, Facultad de CC Químicas, and ‡Servicio General
de Difracción de Rayos X, Facultad de Ciencias,Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - P. Herrero Teijón
- Departamento de Química
Orgánica, Facultad de CC Químicas, and ‡Servicio General
de Difracción de Rayos X, Facultad de Ciencias,Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - R. Rabanedo Clemente
- Departamento de Química
Orgánica, Facultad de CC Químicas, and ‡Servicio General
de Difracción de Rayos X, Facultad de Ciencias,Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - R. Rubio González
- Departamento de Química
Orgánica, Facultad de CC Químicas, and ‡Servicio General
de Difracción de Rayos X, Facultad de Ciencias,Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| | - F. Sanz González
- Departamento de Química
Orgánica, Facultad de CC Químicas, and ‡Servicio General
de Difracción de Rayos X, Facultad de Ciencias,Universidad de Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain
| |
Collapse
|
11
|
Fernández-Mateos A, Ramos Silvo AI, Rubio González R, Simmonds MSJ. Synthesis of CDE molecular fragments related to sendanin mediated by titanocene(III). Org Biomol Chem 2012; 10:5620-8. [PMID: 22717555 DOI: 10.1039/c2ob25538c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A practical, brief, and diastereoselective synthesis of limonoid CDE fragments from a readily available starting material is described. The key step was the titanocene(III)-promoted cyclization of unsaturated epoxylactones, readily prepared from α-cyclocitral. In this way, we confirm the viability of our procedure for the synthesis of a limonoid model with different functionalization patterns. We also report the antifeedant activity of epoxylactones 18 and 19, which show significant antifeedant activity against Spodoptera littoralis and Spodoptera frugiperda, two insect species with different feeding ecologies.
Collapse
Affiliation(s)
- A Fernández-Mateos
- Departamento de Química Orgánica, Facultad de CC. Químicas, Universidad de Salamanca, Plaza de los Caídos 1-5, 37008, Salamanca, Spain.
| | | | | | | |
Collapse
|
12
|
Affiliation(s)
- Brian Heasley
- Scynexis, Inc., P. O. Box 12878, Research Triangle Park, NC 27709‐2878, USA, Fax: +1‐919‐5448697
| |
Collapse
|
13
|
Fernández-Mateos A, Herrero Teijón P, Pascual Coca G, Rubio González R, Simmonds M. Synthesis of limonoid CDE fragments related to limonin and nimbinim. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.07.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
14
|
Ramachandiran K, Karthikeyan K, Muralidharan D, Perumal P. Synthesis of isoxazolobenzoxepanes via Michael addition of indoles to nitroalkenes and sequential intramolecular nitrile oxide cycloaddition. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.04.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
15
|
Mendelsohn BA, Ciufolini MA. Approach to tetrodotoxin via the oxidative amidation of a phenol. Org Lett 2009; 11:4736-9. [PMID: 19769386 DOI: 10.1021/ol901914u] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An approach to tetrodotoxin that relies on the oxidative amidation of methyl 4-hydroxyphenylacetate as a key step is described. The stereoselective introduction of a beta-hydroxynitrile functionality on one of the double bonds of the emerging dienone is achieved through an intramolecular nitrile oxide cycloaddition-fragmentation sequence.
Collapse
Affiliation(s)
- Brian A Mendelsohn
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | | |
Collapse
|
16
|
Aburano D, Inagaki F, Tomonaga S, Mukai C. Synthesis of a core carbon framework of cyanosporasides A and B. J Org Chem 2009; 74:5590-4. [PMID: 19558182 DOI: 10.1021/jo901141t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of 3-(2-ethynylphenyl)prop-2-ynyl benzenesulfinate with 2.5 mol % of [RhCl(CO)(2)](2) at 40 degrees C under an atmosphere of CO effected the successive 2,3-sigmatropic rearrangement and carbonylative [2 + 2 + 1] ring-closing reaction to afford the 8-(phenylsulfonyl)-1H-cyclopent[a]-inden-2-one in a high yield. Chemical modification of the ring-closed product via lipase-mediated optical resolution produced the optically active 3-acetoxy-3a-cyclohexyloxy-3,3a-dihydrocyclopent-[a]indene skeleton, the core carbon framework of cyanosporasides A and B.
Collapse
Affiliation(s)
- Daisuke Aburano
- Division of Pharmaceutical Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | | | | | | |
Collapse
|
17
|
Kamimura A, Yoshida T, Uno H. Stereoselective synthesis of azepines through the conjugate addition of formamides to nitroalkenes and subsequent intramolecular nitrile oxide cycloaddition reaction. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.09.070] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
18
|
Bonne D, Salat L, Dulcère JP, Rodriguez J. Sequential Organocatalyzed Michael Addition/[3 + 2]-Heterocyclization for the Stereoselective Synthesis of Fused-Isoxazoline Precursors of Enantiopure Cyclopentanoids. Org Lett 2008; 10:5409-12. [DOI: 10.1021/ol8023133] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Damien Bonne
- Aix-Marseille Université, Institut des Sciences Moléculaires de Marseille, iSm2 CNRS UMR 6263, Centre Saint Jérôme, service 531, 13397 Marseille Cedex 20, France
| | - Lydie Salat
- Aix-Marseille Université, Institut des Sciences Moléculaires de Marseille, iSm2 CNRS UMR 6263, Centre Saint Jérôme, service 531, 13397 Marseille Cedex 20, France
| | - Jean-Pierre Dulcère
- Aix-Marseille Université, Institut des Sciences Moléculaires de Marseille, iSm2 CNRS UMR 6263, Centre Saint Jérôme, service 531, 13397 Marseille Cedex 20, France
| | - Jean Rodriguez
- Aix-Marseille Université, Institut des Sciences Moléculaires de Marseille, iSm2 CNRS UMR 6263, Centre Saint Jérôme, service 531, 13397 Marseille Cedex 20, France
| |
Collapse
|
19
|
Behenna DC, Corey EJ. Simple Enantioselective Approach to Synthetic Limonoids. J Am Chem Soc 2008; 130:6720-1. [DOI: 10.1021/ja802376g] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Douglas C. Behenna
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| | - E. J. Corey
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138
| |
Collapse
|
20
|
|
21
|
|
22
|
Hou XL, Yang Z, Yeung KS, Wong HN. Five–membered ring systems: furans and benzofurans. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/s0959-6380(07)80011-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
|