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Xie J, Dong G. Cyclopropylcarbinyl cation chemistry in synthetic method development and natural product synthesis: cyclopropane formation and skeletal rearrangement. Org Chem Front 2023. [DOI: 10.1039/d3qo00282a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
In this Review, the underrecognized utilities of the cyclopropylcarbinyl cation chemistry are summarized in cyclopropane synthesis and skeletal rearrangements, and their applications in natural product total synthesis are highlighted.
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2
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Solans MM, Basistyi VS, Law JA, Bartfield NM, Frederich JH. Programmed Polyene Cyclization Enabled by Chromophore Disruption. J Am Chem Soc 2022; 144:6193-6199. [PMID: 35377634 PMCID: PMC10559755 DOI: 10.1021/jacs.2c02144] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A new polyene cyclization strategy exploiting β-ionyl derivatives was developed. Photoinduced deconjugation of the extended π-system within these chromophores unveils a contrathermodynamic polyene that engages in a Heck bicyclization to afford [4.4.1]-propellanes. This cascade improves upon the limited regioselectivity achieved using existing biomimetic tactics and tolerates both electron-rich and electron-deficient (hetero)aryl groups. The utility of this approach was demonstrated with the diverted total synthesis of taxodione and salviasperanol, two isomeric abietane diterpenes that were previously inaccessible along the same synthetic pathway.
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Affiliation(s)
- Megan M Solans
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Vitalii S Basistyi
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - James A Law
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Noah M Bartfield
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - James H Frederich
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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Suescun L, Heinzen H. Absolute structure of (3a S,5 S,7a S,7b S,9a R,10 R,12a R,12b S)-7b-hy-droxy-4,4,7a,9a,12a-penta-methyl-10-[(2' R)-6-methyl-heptan-2-yl]-2,8,9-trioxo-octa-deca-hydro-benzo[ d]indeno-[4,5- b]azepin-5-yl acetate from 62-year-old crystals. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2019; 75:1348-1351. [PMID: 31523464 PMCID: PMC6727055 DOI: 10.1107/s205698901901140x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 08/13/2019] [Indexed: 11/11/2022]
Abstract
The structure of the title compound was determined using single crystals obtained more than 60 years ago at the Facultad de Química, Universidad de la República. The chemical structure of the compound, now confirmed by X-ray diffraction, was determined spectroscopically and was relevant in the determination of the structure of lanosterol and other triterpenoids in the early 50′s. The structure of the title compound, C32H51NO6, was determined from 62-year-old crystals at room temperature and refined with 100 K data in a monoclinic (C2) space group. This compound with a triterpenoid structure, now confirmed by this study, played an important role in the determination of the structure of lanosterol. The molecules pack in linear O—H⋯O hydrogen-bonded chains along the short axis (b), while parallel chains display weak van der Waals interactions that explain the needle-shaped crystal morphology. The structure exhibits disorder of the flexible methylheptane chain at one end of the main molecule with a small void around it. Crystals of the compounds were resistant to data collection for decades with the available cameras and Mo Kα radiation single-crystal diffractometer in our laboratory until a new instrument with Cu Kα radiation operating at 100 K allowed the structure to be solved and refined.
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Affiliation(s)
- Leopoldo Suescun
- Cryssmat-Lab/DETEMA, Facultad de Química, Universidad de la República, Av., Gral., Flores 2124, Montevideo 11800, Uruguay
| | - Horacio Heinzen
- Departamento de Química Orgánica, Facultad de Química, Universidad de la República, Av. Gral. Flores 2124, Montevideo 11800, Uruguay
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Wang Y, Ju W, Tian H, Sun S, Li X, Tian W, Gui J. Facile Access to Bridged Ring Systems via Point-to-Planar Chirality Transfer: Unified Synthesis of Ten Cyclocitrinols. J Am Chem Soc 2019; 141:5021-5033. [PMID: 30827095 DOI: 10.1021/jacs.9b00925] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bridged ring systems are found in a wide variety of biologically active molecules including pharmaceuticals and natural products. However, the development of practical methods to access such systems with precise control of the planar chirality presents considerable challenges to synthetic chemists. In the context of our work on the synthesis of cyclocitrinols, a family of steroidal natural products, we herein report the development of a point-to-planar chirality transfer strategy for preparing bridged ring systems from readily accessible fused ring systems. Inspired by the proposed pathway for biosynthesis of cyclocitrinols from ergosterol, our strategy involves a bioinspired cascade rearrangement, which enabled the gram-scale synthesis of a common intermediate in nine steps and subsequent unified synthesis of 10 cyclocitrinols in an additional one to three steps. Our work provides experimental support for the proposed biosynthetic pathway and for the possible interrelationships between members of the cyclocitrinol family. In addition to being a convenient route to 5(10→19) abeo-steroids, our strategy also offers a generalized approach to bridged ring systems via point-to-planar chirality transfer. Mechanistic investigations suggest that the key cascade rearrangement involves a regioselective ring scission of a cyclopropylcarbinyl cation rather than a direct Wagner-Meerwein rearrangement.
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Affiliation(s)
- Yu Wang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Wei Ju
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Hailong Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Suyun Sun
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Xinghui Li
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Weisheng Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Jinghan Gui
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
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Chaudhari MB, Chaudhary A, Kumar V, Gnanaprakasam B. The Rearrangement of Peroxides for the Construction of Fluorophoric 1,4-Benzoxazin-3-one Derivatives. Org Lett 2019; 21:1617-1621. [DOI: 10.1021/acs.orglett.9b00155] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Moreshwar B. Chaudhari
- Department of Chemistry, Indian Institute of Science Education and Research, Pune-411008, Maharashtra, India
| | - Atul Chaudhary
- Department of Chemistry, Indian Institute of Science Education and Research, Pune-411008, Maharashtra, India
| | - Vishnupriya Kumar
- Department of Chemistry, Indian Institute of Science Education and Research, Pune-411008, Maharashtra, India
| | - Boopathy Gnanaprakasam
- Department of Chemistry, Indian Institute of Science Education and Research, Pune-411008, Maharashtra, India
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Abstract
A 10-step synthesis of the C25 steroid natural product cyclocitrinol from inexpensive, commercially available pregnenolone is reported. This synthesis features a biomimetic cascade rearrangement to efficiently construct the challenging bicyclo[4.4.1] A/B ring system, which enabled a gram-scale synthesis of the bicyclo[4.4.1] enone intermediate 18 in only nine steps. This work also provides experimental support for the biosynthetic origin of cyclocitrinol.
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Affiliation(s)
- Yu Wang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Wei Ju
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Hailong Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Weisheng Tian
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
| | - Jinghan Gui
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Center for Excellence in Molecular Synthesis , Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences , 345 Lingling Road , Shanghai 200032 , China
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Abstract
A synthetic route to derive the skeleton of naphthalenes starting with isovanillin is described with modest total yields via the key transformation of metal triflate-mediated intramolecular benzannulation of o-formyl or o-benzoyl allylbenzenes in MeNO2 at rt.
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Affiliation(s)
- Chieh-Kai Chan
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Heui-Sin Wang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Yu-Lin Tsai
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
| | - Meng-Yang Chang
- Department of Medicinal and Applied Chemistry
- Kaohsiung Medical University Hospital
- Kaohsiung Medical University
- Kaohsiung 80708
- Taiwan
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Chan CK, Chen YH, Chang MY. Tin triflate promoted synthesis of bicyclic and tricyclic sulfonyl dihydropyrans. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.07.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Kranz DP, Chiha S, Meier zu Greffen A, Neudörfl JM, Schmalz HG. Synthesis of B-Ring-Modified Steroids through BF3-Promoted Rearrangement/Substitution of 6β-Hydroxy-5,19-cyclosteroids. Org Lett 2012; 14:3692-5. [DOI: 10.1021/ol301532w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Darius P. Kranz
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
| | - Slim Chiha
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
| | | | - Jörg-Martin Neudörfl
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
| | - Hans-Günther Schmalz
- Department of Chemistry, University of Cologne, Greinstr. 4, 50939 Köln, Germany
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