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Rao MLN, Islam SS. Rearrangement-Driven Molecular Diversity: Synthesis of Functionalized Pyrones, Orthoesters, and Xanthones from Spiroketals. Org Lett 2021; 23:8668-8672. [PMID: 34714091 DOI: 10.1021/acs.orglett.1c02888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of tricyclic 5,5-benzannulated spiroketals with trifluoroacetic acid (TFA) and AlCl3 furnished benzopyranobenzopyrans, benzofuro-orthoesters, and benzofuroxanthones. Whereas the reaction of tricyclic 5,5-benzannulated spiroketals with TFA produced the pyrones, the reaction with AlCl3 furnished densely functionalized orthoesters and xanthones. The formation of these products was rationalized by fascinating mechanistic pathways involving semipinacol/α-ketol molecular rearrangements.
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Affiliation(s)
- Maddali L N Rao
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Sk Shamim Islam
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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2
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Montaña ÁM, Ponzano S, Sanasi MF, Kociok-Köhn G. Synthesis of the 10-oxabicyclo[5.2.1]decane framework present in bioactive natural products. Org Biomol Chem 2018; 16:1557-1580. [PMID: 29437174 DOI: 10.1039/c8ob00194d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The present work deals with the synthesis of the 10-oxabicyclo[5.2.1]decane framework present in bioactive natural products like physalins, with potential as antitumor agents. This synthetic methodology involves several key reactions: (a) synthesis of polyfunctionalized cycloheptenones by [4 + 3] cycloaddition reactions of furan precursors with oxyallyl cations; (b) Nicholas reaction with propargyl cations stabilized as dicobalt hexacarbonyl complexes; (c) demetallation and hydration of the resulting acetylenes; (d) stereoconvergent aldol cyclization to generate a key oxatricyclic intermediate and (e) a β-fragmentation process that affords, under hypoiodite photolysis, the desired product with moderate to good yield. The final compounds are the result of a radicalary β-fragmentation at the level of C2-C6 with respect to the tertiary hydroxyl group on C6, with an unexpected contraction from a ten- to a nine-membered ring system, via a radical addition to the carbonyl group on C4. The synthetic methodology has been scaled up to multigram level with good overall yield. Further biological, biochemical and biophysical studies are being carried out in our laboratory on these 1,7-epoxycyclononane derivatives to determine the potential of this kind of oxabicyclic compound as future hits and/or leads for the development of new anticancer drugs. The preliminary evaluation of the anticancer activity of the representative synthesized compounds, against the leukaemia cancer cell lines K-562 and SR, shows a promising activity with a GI50 = 0.01 μM and a LC50 = 7.4 μM for a conveniently functionalized 10-oxabicyclo[5.2.1]decane.
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Affiliation(s)
- Ángel M Montaña
- Industrial and Applied Organic Chemistry Research Unity, Department of Inorganic and Organic Chemistry, Universidad de Barcelona, Martí Franquès 1-11, 08028-Barcelona, Spain.
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3
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Katsuta R, Masada N, Shimodaira Y, Ueda S, Yajima A, Nukada T. Synthesis and stereochemistry of decarestrictines H and J. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Katsuta R, Fujikawa S, Yajima A, Nukada T. Stereoselective synthesis of (−)-decarestrictine G. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.082] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Shi YM, Yang J, Xu L, Li XN, Shang SZ, Cao P, Xiao WL, Sun HD. Structural Characterization and Antioxidative Activity of Lancifonins: Unique Nortriterpenoids from Schisandra lancifolia. Org Lett 2014; 16:1370-3. [PMID: 24552471 DOI: 10.1021/ol5001186] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yi-Ming Shi
- State
Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jie Yang
- Laboratory
of Cellular and Molecular Biology, Jiangsu Branch of China Academy of Traditional Chinese Medicine, Nanjing 210028, Jiangsu, P. R. China
| | - Li Xu
- State
Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xiao-Nian Li
- State
Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, P. R. China
| | - Shan-Zhai Shang
- State
Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, P. R. China
| | - Peng Cao
- Laboratory
of Cellular and Molecular Biology, Jiangsu Branch of China Academy of Traditional Chinese Medicine, Nanjing 210028, Jiangsu, P. R. China
| | - Wei-Lie Xiao
- State
Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, P. R. China
| | - Han-Dong Sun
- State
Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, P. R. China
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Ostovar M, Marson CM. Enynone dihydroxylation–cyclisation as a route to densely functionalised 3(2H)-furanone derivatives: an approach to the core of the zaragozic acids. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.125] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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7
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Song ZL, Fan CA, Tu YQ. Semipinacol Rearrangement in Natural Product Synthesis. Chem Rev 2011; 111:7523-56. [PMID: 21851053 DOI: 10.1021/cr200055g] [Citation(s) in RCA: 385] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Zhen-Lei Song
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Chun-An Fan
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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Nandurdikar RS, Subrahmanyam AV, Kaliappan KP. Synthesis of a Novel Taxa-Oxa-Sugar Hybrid Core Structure by Tandem Cross-Enyne Metathesis/IMDA. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Han C, Rangarajan S, Voukides AC, Beeler AB, Johnson R, Porco JA. Reaction discovery employing macrocycles: transannular cyclizations of macrocyclic bis-lactams. Org Lett 2009; 11:413-6. [PMID: 19102683 DOI: 10.1021/ol802729f] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Macrocyclic bis-lactams have been synthesized by cyclodimerization of homoallylic amino esters employing a Zr(IV)-catalyzed ester-amide exchange protocol. Base-mediated transannular cyclizations have been identified to access both bicyclic [5-11] and tricyclic [5-8-5] frameworks in good yield and diastereoselectivity. Preliminary mechanistic studies support an olefin isomerization-intramolecular conjugate addition pathway.
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Affiliation(s)
- Chong Han
- Department of Chemistry and Center for Chemical Methodology and Library Development, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
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10
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Ti-catalyzed transannular cyclization of epoxygermacrolides. Synthesis of antifungal (+)-tuberiferine and (+)-dehydrobrachylaenolide. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.08.114] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Sandoval C, López-Pérez JL, Bermejo F. Synthesis of a 10-membered ring with eleutheside functionality by Nozaki–Hiyama–Kishi coupling. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Montaña ÁM, Ponzano S, Kociok-Köhn G, Font-Bardia M, Solans X. Versatile Methodology to Synthesize Oxygen-Bridged Nine- and Ten-Membered Cycloalkanes by the Hypoiodite Reaction. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700172] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Shinkevich EY, Novikov MS, Khlebnikov AF, Kostikov RR, Kopf J, Magull J. New type of transannular reactions in azirine-fused medium-size heterocycles: Selective transformations of azirino[2,1-e][1,6]benzoxazocines and -benzothiazocines into oxa(thia)zine and oxa(thia)zole derivatives. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2007. [DOI: 10.1134/s1070428007070214] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Marson CM, Edaan E, Morrell JM, Coles SJ, Hursthouse MB, Davies DT. A catalytic asymmetric protocol for the enantioselective synthesis of 3(2H)-furanones. Chem Commun (Camb) 2007:2494-6. [PMID: 17563807 DOI: 10.1039/b701548h] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
3(2H)-Furanones can be prepared by a catalytic asymmetric protocol from enynones, which, if electron-rich, require only one reagent and involve two reactions in a single operation--a domino process.
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Affiliation(s)
- Charles M Marson
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon Street, London, UK.
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Montaña ÁM, Ponzano S. Synthesis of 1,7-epoxycyclononanes and 1,8-epoxycyclodecanes by β-fragmentation reactions using LTA and I2. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.09.103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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16
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Bermejo FA, Fernández Mateos A, Marcos Escribano A, Martín Lago R, Mateos Burón L, Rodríguez López M, Rubio González R. Ti(III)-promoted cyclizations. Application to the synthesis of (E)-endo-bergamoten-12-oic acids. Moth oviposition stimulants isolated from Lycopersicon hirsutum. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.07.020] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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17
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Hamura T, Ibusuki Y, Uekusa H, Matsumoto T, Siegel JS, Baldridge KK, Suzuki K. Dodecamethoxy- and Hexaoxotricyclobutabenzene: Synthesis and Characterization. J Am Chem Soc 2006; 128:10032-3. [PMID: 16881630 DOI: 10.1021/ja064063e] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report herein the syntheses of dodecamethoxytricyclobutabenzene (TCBB) 1 and hexaoxo-TCBB 2, a class of molecules with structural and theoretical interest. The preparation is based on the 3-fold [2 + 2] cycloadditions of benzyne and ketene silyl acetals (KSAs), where the selectively protected 2-iodophloroglucinol derivative served as a synthetic equivalent of benztriyne I, allowing rapid and regioselective annulation of fully functionalized four-membered rings. Structural study on the former compound showed that the C-C bond lengths in the central benzene ring were essentially the same.
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Affiliation(s)
- Toshiyuki Hamura
- Interactive Research Center of Science, Department of Chemistry, Tokyo Institute of Technology, SORST, Japan Science and Technology Corporation (JST), O-okayama, Meguro-ku, Tokyo 152-8551, Japan
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Hamura T, Ibusuki Y, Uekusa H, Matsumoto T, Suzuki K. Poly-Oxygenated Tricyclobutabenzenes via Repeated [2 + 2] Cycloaddition of Benzyne and Ketene Silyl Acetal. J Am Chem Soc 2006; 128:3534-5. [PMID: 16536523 DOI: 10.1021/ja0602647] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Described herein is a synthesis of highly functionalized tricyclobutabenzenes, a class of molecules of structural and theoretical interest. The preparation is based on the repeated [2 + 2] cycloadditions of benzyne and ketene silyl acetals (KSAs), where two types of regioselectivity enable discrimination of the functionalities on the four-membered rings. By these steps, we were able to prepare poly-oxygenated octamethoxytricyclobutabenzene and its hydrolyzed tetra-oxo derivatives. Structural study on the latter compound showed the interesting properties related to the strained four-membered ring.
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Affiliation(s)
- Toshiyuki Hamura
- Department of Chemistry, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8551, Japan
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Khlebnikov AF, Novikov MS, Shinkevich EY, Vidovic D. Selective transannular ring transformations in azirino-fused eight-membered O,N- or S,N-heterocycles. Org Biomol Chem 2005; 3:4040-2. [PMID: 16267578 DOI: 10.1039/b512409c] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first examples of transannular ring transformations in azirino-fused eight-membered O,N- or S,N-heterocycles involving selective aziridine ring opening and medium-sized ring contraction are described, which provide an access to functionalized 1,4-benzox(thi)azines or 1,3-benzox(thi)azoles.
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Affiliation(s)
- Alexander F Khlebnikov
- Department of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Petrodvorets, Russia.
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