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Yang P, Li YY, Tian H, Qian GL, Wang Y, Hong X, Gui J. Syntheses of Bufospirostenin A and Ophiopogonol A by a Conformation-Controlled Transannular Prins Cyclization. J Am Chem Soc 2022; 144:17769-17775. [PMID: 36125970 DOI: 10.1021/jacs.2c07944] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Controlling the conformation of medium-sized rings is challenging because of their flexibility and ring strain effects. Herein, we report non-Curtin-Hammett conditions for the precise control of the conformation of cyclodecenones to effect the first cis-selective transannular Prins cyclization, which enabled concise syntheses of the 5(10→1)abeo-steroids bufospirostenin A and ophiopogonol A in only seven steps from inexpensive starting materials. Computational results indicated that the key cyclization was kinetically controlled and proceeded via either a Prins pathway or a carbonyl-ene pathway, depending on the reaction conditions. Moreover, conformational isomerization played a critical role in determining the stereochemistry of the products.
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Affiliation(s)
- Peicheng Yang
- Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China.,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
| | - Yan-Yu Li
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, 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
| | - Gan-Lu Qian
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yun 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
| | - Xin Hong
- Center of Chemistry for Frontier Technologies, Department of Chemistry, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.,Beijing National Laboratory for Molecular Sciences, Zhongguancun North First Street No. 2, Beijing 100190, PR China.,Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, School of Science, Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang Province, China
| | - Jinghan Gui
- Shanghai Frontiers Science Center for TCM Chemical Biology, Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai 201203, China.,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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Pinet A, Nguyen LT, Figadère B, Ferrié L. Synthesis of 3,5‐Disubstituted 1,2‐Dioxolanes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000980] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Alexis Pinet
- BioCIS Faculté de Pharmacie Université Paris‐Saclay 5 rue J. B. Clément 92290 Châtenay‐Malabry France
| | - Linh T. Nguyen
- Institute of Marine Biochemistry (IMBC) Vietnam Academy of Science and Technology (VAST) Vietnam
| | - Bruno Figadère
- BioCIS Faculté de Pharmacie Université Paris‐Saclay 5 rue J. B. Clément 92290 Châtenay‐Malabry France
| | - Laurent Ferrié
- BioCIS Faculté de Pharmacie Université Paris‐Saclay 5 rue J. B. Clément 92290 Châtenay‐Malabry France
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Riehl PS, Nasrallah DJ, Schindler CS. Catalytic, transannular carbonyl-olefin metathesis reactions. Chem Sci 2019; 10:10267-10274. [PMID: 32110312 PMCID: PMC6979496 DOI: 10.1039/c9sc03716k] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 09/19/2019] [Indexed: 12/30/2022] Open
Abstract
Transannular carbonyl-olefin metathesis reactions complement existing procedures for related ring-closing, ring-opening, and intermolecular carbonyl-olefin metathesis. We herein report the development and mechanistic investigation of FeCl3-catalyzed transannular carbonyl-olefin metathesis reactions that proceed via a distinct reaction path compared to previously reported ring-closing and ring-opening protocols. Specifically, carbonyl-ene and carbonyl-olefin metathesis reaction pathways are competing under FeCl3-catalysis to ultimately favor metathesis as the thermodynamic product. Importantly, we show that distinct Lewis acid catalysts are able to distinguish between these pathways to enable the selective formation of either transannular carbonyl-ene or carbonyl-olefin metathesis products. These insights are expected to enable further advances in catalyst design to efficiently differentiate between these two competing reaction paths of carbonyl and olefin functionalities to further expand the synthetic generality of carbonyl-olefin metathesis.
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Affiliation(s)
- Paul S Riehl
- Willard Henry Dow Laboratory , Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , USA .
| | - Daniel J Nasrallah
- Willard Henry Dow Laboratory , Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , USA .
| | - Corinna S Schindler
- Willard Henry Dow Laboratory , Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , USA .
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Affiliation(s)
- Masahiro Murakami
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
| | - Naoki Ishida
- Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Katsura, Kyoto 615-8510
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Abstract
The preparation, structure, and chemistry of hypervalent iodine compounds are reviewed with emphasis on their synthetic application. Compounds of iodine possess reactivity similar to that of transition metals, but have the advantage of environmental sustainability and efficient utilization of natural resources. These compounds are widely used in organic synthesis as selective oxidants and environmentally friendly reagents. Synthetic uses of hypervalent iodine reagents in halogenation reactions, various oxidations, rearrangements, aminations, C-C bond-forming reactions, and transition metal-catalyzed reactions are summarized and discussed. Recent discovery of hypervalent catalytic systems and recyclable reagents, and the development of new enantioselective reactions using chiral hypervalent iodine compounds represent a particularly important achievement in the field of hypervalent iodine chemistry. One of the goals of this Review is to attract the attention of the scientific community as to the benefits of using hypervalent iodine compounds as an environmentally sustainable alternative to heavy metals.
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Affiliation(s)
- Akira Yoshimura
- Department of Chemistry and Biochemistry, University of Minnesota Duluth , Duluth, Minnesota 55812, United States
| | - Viktor V Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth , Duluth, Minnesota 55812, United States
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6
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Cooper HLR, Groves JT. Molecular probes of the mechanism of cytochrome P450. Oxygen traps a substrate radical intermediate. Arch Biochem Biophys 2011; 507:111-8. [PMID: 21075070 PMCID: PMC3041850 DOI: 10.1016/j.abb.2010.11.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2010] [Revised: 11/05/2010] [Accepted: 11/05/2010] [Indexed: 01/05/2023]
Abstract
The diagnostic substrate tetramethylcyclopropane (TMCP) has been reexamined as a substrate with three drug- and xenobiotic-metabolizing cytochrome P450 enzymes, human CYP2E1, CYP3A4 and rat CYP2B1. The major hydroxylation product in all cases was the unrearranged primary alcohol along with smaller amounts of a rearranged tertiary alcohol. Significantly, another ring-opened product, diacetone alcohol, was also observed. With CYP2E1 this product accounted for 20% of the total turnover. Diacetone alcohol also was detected as a product from TMCP with a biomimetic model catalyst, FeTMPyP, but not with a ruthenium porphyrin catalyst. Lifetimes of the intermediate radicals were determined from the ratios of rearranged and unrearranged products to be 120, 13 and 1ps for CYP2E1, CYP3A4 and CYP2B1, respectively, corresponding to rebound rates of 0.9×10(10)s(-1), 7.2×10(10)s(-1) and 1.0×10(12)s(-1). For the model iron porphyrin, FeTMPyP, a radical lifetime of 81ps and a rebound rate of 1.2×10(10)s(-1) were determined. These apparent radical lifetimes are consistent with earlier reports with a variety of CYP enzymes and radical clock substrates, however, the large amounts of diacetone alcohol with CYP2E1 and the iron porphyrin suggest that for these systems a considerable amount of the intermediate carbon radical is trapped by molecular oxygen. These results add to the view that cage escape of the intermediate carbon radical in [Fe(IV)-OH ()R] can compete with cage collapse to form a C-O bond. The results could be significant with regard to our understanding of iron-catalyzed C-H hydroxylation, the observation of P450-dependent peroxidation and the development of oxidative stress, especially for CYP2E1.
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Affiliation(s)
| | - John T. Groves
- Department of Chemistry, Princeton University, Princeton NJ 08544 USA
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Baba H, Togo H. Sulfonylamidation of alkylbenzenes at benzylic position with p-toluenesulfonamide and 1,3-diiodo-5,5-dimethylhydantoin. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.060] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Kantorowski EJ, Le DD, Hunt CJ, Barry-Holson KQ, Lee JP, Ross LN. Kinetics and regioselectivity of ring opening of 1-bicyclo[3.1.0]hexanylmethyl radical. J Org Chem 2008; 73:1593-6. [PMID: 18197677 DOI: 10.1021/jo702010v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rate constants for the rearrangement of 1-bicyclo[3.1.0]hexanylmethyl radical (2) to 3-methylenecyclohexenyl radical (3) and 2-methylenecyclopentyl-1-methyl radical (1) were measured using the PTOC-thiol competition method. The ring-expansion pathway is described by the rate equation, log(k/s-1) = (12.5 +/- 0.1) - (4.9 +/- 0.1)/theta; the non-expansion pathway is described by log(k/s-1) = (11.9 +/- 0.6) - (6.9 +/- 0.8)/theta. Employing the slower trapping agent, tri-n-butylstannane, favors methylenecyclohexane over 2-methyl-methylenecyclopentane by more than 120:1 at ambient or lower temperatures.
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Affiliation(s)
- Eric J Kantorowski
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, USA.
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Barluenga J, González-Bobes F, Ananthoju SR, García-Martín MA, González JM. Oxidative Opening of Cycloalkanols: An Efficient Entry to omega-Iodocarbonyl Compounds This research was supported by DGES (Grant PB97-1271). F.G.-B. thanks FICYT for a fellowship. Angew Chem Int Ed Engl 2001; 40:3389-3392. [PMID: 11592147 DOI: 10.1002/1521-3773(20010917)40:18<3389::aid-anie3389>3.0.co;2-v] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- José Barluenga
- Instituto Universitario de Química Organometálica "Enrique Moles", Unidad Asociada al C.S.I.C Universidad de Oviedo 33071 Oviedo (Spain)
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Barluenga J, González-Bobes F, Ananthoju SR, García-Martín MA, González JM. Die oxidative Öffnung von Cycloalkanolen: ein effizienter Zugang zuω-Iodcarbonylverbindungen. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20010917)113:18<3491::aid-ange3491>3.0.co;2-u] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Katohgi M, Togo H, Yamaguchi K, Yokoyama M. New synthetic method to 1,2-benzisothiazoline-3-one- 1,1-dioxides and 1,2-benzisothiazoline-3-one-1-oxides from N-alkyl(o-methyl) arenesulfonamides. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00974-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Togo H, Hoshina Y, Muraki T, Nakayama H, Yokoyama M. Study on Radical Amidation onto Aromatic Rings with (Diacyloxyiodo)arenes. J Org Chem 1998. [DOI: 10.1021/jo980450y] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hideo Togo
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Yoichiro Hoshina
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Takahito Muraki
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Hiromasa Nakayama
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Masataka Yokoyama
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
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Affiliation(s)
- Peter J. Stang
- Department of Chemistry, University of Minnesota-Duluth, Duluth, Minnesota 55812
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14
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Muraki T, Togo H, Yokoyama M. Remote functionalization: Cyclic alkoxylation onto aromatic ring via radical pathway. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)00313-9] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Togo H, Muraki T, Yokoyama M. Remote functionalization (1): Synthesis of γ- and δ-lactones from aromatic carboxylic acids. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)01432-h] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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