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Reduction of bis(5-alkyl-2-furyl)(2-nitroaryl)methane with aqueous titanium trichloride solution. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132407] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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2
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Lv YF, Ren FC, Kuang MT, Miao Y, Li ZL, Hu JM, Zhou J. Total Synthesis of Gastrodinol via Photocatalytic 6π Electrocyclization. Org Lett 2020; 22:6822-6826. [PMID: 32830986 DOI: 10.1021/acs.orglett.0c02335] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first total synthesis of gastrodinol, an unprecedented poly-p-cresol-substituted natural product with a rearranged and reconstructed C ring moiety, is reported. Our synthesis features a convergent fragment approach. The Sonogashira coupling reaction forges the two segments together to furnish the conjugated ene-yne. Photocatalytic 6π electrocyclization followed by spontaneous aromatization is used to construct the tetrasubstituted B ring at the late stage. Further study shows that gastrodinol exhibits significant cytotoxic activity against five human cancer cell lines in vitro (IC50 2.5-3.8 μM).
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Affiliation(s)
- Yong-Feng Lv
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Fu-Cai Ren
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Meng-Ting Kuang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Yu Miao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Zhi-Lan Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Jiang-Miao Hu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China.,University of Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Jun Zhou
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan Key Laboratory of Natural Medicinal Chemistry, Kunming 650201, P.R. China
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3
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Ciccolini C, De Crescentini L, Mantellini F, Santeusanio S, Favi G. Zn(II)-Catalyzed Addition of Aromatic/Heteroaromatic C(sp 2)-H to Azoalkenes: A Polarity-Reversed Arylation of Carbonyl Compounds. Org Lett 2019; 21:4388-4391. [PMID: 31117718 DOI: 10.1021/acs.orglett.9b01628] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
An umpolung α-(hetero)arylation strategy that involves the Michael-type reaction between electron-rich (hetero)aromatic substrates and azoalkenes is developed. The reaction proceeds under very mild conditions at room temperature and in the presence of inexpensive, nontoxic ZnCl2 catalyst to provide access to otherwise inaccessible hydrazone structures. Subsequent hydrolysis of these latter to ketones as well as other valuable synthetic transformations to a variety of heterocyclic scaffolds demonstrate the usefulness of this protocol.
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Affiliation(s)
- Cecilia Ciccolini
- Department of Biomolecular Sciences, Section of Chemistry and Pharmaceutical Technologies , University of Urbino "Carlo Bo" , Via I Maggetti 24 , 61029 Urbino , Italy
| | - Lucia De Crescentini
- Department of Biomolecular Sciences, Section of Chemistry and Pharmaceutical Technologies , University of Urbino "Carlo Bo" , Via I Maggetti 24 , 61029 Urbino , Italy
| | - Fabio Mantellini
- Department of Biomolecular Sciences, Section of Chemistry and Pharmaceutical Technologies , University of Urbino "Carlo Bo" , Via I Maggetti 24 , 61029 Urbino , Italy
| | - Stefania Santeusanio
- Department of Biomolecular Sciences, Section of Chemistry and Pharmaceutical Technologies , University of Urbino "Carlo Bo" , Via I Maggetti 24 , 61029 Urbino , Italy
| | - Gianfranco Favi
- Department of Biomolecular Sciences, Section of Chemistry and Pharmaceutical Technologies , University of Urbino "Carlo Bo" , Via I Maggetti 24 , 61029 Urbino , Italy
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4
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Hu F, Zhou Q, Cao F, Chu WD, He L, Liu QZ. Enantioselective Formal [4+1] Cycloaddition of Diazoarylacetates and the Danishefsky's Diene: Stereoselective Synthesis of (-)-1,13-Herbertenediol. J Org Chem 2018; 83:12806-12814. [PMID: 30215518 DOI: 10.1021/acs.joc.8b01546] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rodium chiral diene complex-catalyzed enantioselective cycloaddition of aryl α-diazoarylacetates and electron-enriched Danishefsky-type dienes afforded highly functionalized and optically enriched cyclopentenones in excellent yields (up to 97% yield) and with good to excellent enantioselectivities (60-92% ee). (-)-1,13-Herbertenediol was successfully synthesized in an overall 25% yield employing the optically enriched cyclopentenone with an all-carbon quaternary center as the key intermediate.
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Affiliation(s)
- Fang Hu
- Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering , China West Normal University , No 1, Shida Road , Nanchong 637002 , People's Republic of China
| | - Qing Zhou
- Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering , China West Normal University , No 1, Shida Road , Nanchong 637002 , People's Republic of China
| | - Fei Cao
- Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering , China West Normal University , No 1, Shida Road , Nanchong 637002 , People's Republic of China
| | - Wen-Dao Chu
- Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering , China West Normal University , No 1, Shida Road , Nanchong 637002 , People's Republic of China
| | - Long He
- Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering , China West Normal University , No 1, Shida Road , Nanchong 637002 , People's Republic of China
| | - Quan-Zhong Liu
- Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering , China West Normal University , No 1, Shida Road , Nanchong 637002 , People's Republic of China
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5
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Qiu Y, Dlugosch M, Liu X, Khan F, Ward JS, Lan P, Banwell MG. Reductive Cyclization of o-Nitroarylated-α,β-unsaturated Aldehydes and Ketones with TiCl 3/HCl or Fe/HCl Leading to 1,2,3,9-Tetrahydro-4 H-carbazol-4-ones and Related Heterocycles. J Org Chem 2018; 83:12023-12033. [PMID: 30180589 DOI: 10.1021/acs.joc.8b01940] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Compounds such as 3, the product of a palladium[0]-catalyzed Ullmann cross-coupling of o-iodonitrobenzene and 2-iodocyclohex-2-en-1-one, undergo complementary modes of reductive cyclization depending upon the conditions employed. Thus, on treatment with hydrogen in the presence of palladium on carbon, the tetrahydrocarbazole 4 is formed, while reaction of the same substrate (3) with TiCl3 in acetone affords the 1,2,3,9-tetrahydro-4 H-carbazol-4-one 6.
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Affiliation(s)
- Yun Qiu
- Department of Food Science and Engineering , Jinan University , Guangzhou 510632 , China
| | - Michael Dlugosch
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Xin Liu
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Faiyaz Khan
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Jas S Ward
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
| | - Ping Lan
- Department of Food Science and Engineering , Jinan University , Guangzhou 510632 , China
| | - Martin G Banwell
- Research School of Chemistry , Institute of Advanced Studies, The Australian National University , Canberra , ACT 2601 , Australia
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6
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Khan F, Dlugosch M, Liu X, Banwell MG. The Palladium-Catalyzed Ullmann Cross-Coupling Reaction: A Modern Variant on a Time-Honored Process. Acc Chem Res 2018; 51:1784-1795. [PMID: 30010313 DOI: 10.1021/acs.accounts.8b00169] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Cross-coupling reactions, especially those that are catalyzed by palladium, have revolutionized the way in which carbon-carbon bonds can be formed. The most commonly deployed variants of such processes are the Suzuki-Miyaura, Mizoroki-Heck, Stille, and Negishi cross-coupling reactions, and these normally involve the linking of an organohalide or pseudohalide (such as a triflate or nonaflate) with an organo-metallic or -metalloid such as an organo-boron, -magnesium, -tin, or -zinc species. Since the latter type of coupling partner is often prepared from the corresponding halide, methods that allow for the direct cross-coupling of two distinct halogen-containing compounds would provide valuable and more atom-economical capacities for the formation of carbon-carbon bonds. While the venerable Ullmann reaction can in principle achieve this, it has a number of drawbacks, the most significant of which is that homocoupling of the reaction partners is a competitive, if not the dominant, process. Furthermore, such reactions normally occur only under forcing conditions (viz., often at temperatures in excess of 250 °C). As such, the Ullmann reaction has seen only limited application in this regard, especially as a mid- to late-stage feature of complex natural product synthesis. This Account details the development of the palladium-catalyzed Ullmann cross-coupling reaction as a useful method for the assembly of a range of heterocyclic systems relevant to medicinal and/or natural products chemistry. These couplings normally proceed under relatively mild conditions (<100 °C) over short periods of time and, usually, to the exclusion of (unwanted) homocoupling events. The keys to success are the appropriate choice of coupling partners, the form of the copper metal employed, and the choice of reaction solvent. At the present time, the cross-coupling partners capable of engaging in the title reaction are confined to halogenated and otherwise electron-deficient arenes and, as complementary reactants, α- or β-halogenated, α,β-unsaturated aldehydes, ketones, esters, lactones, lactams, and cycloimides. Nitro-substituted (and halogenated) arenes, in particular, serve as effective participants in these reactions, and the products of their coupling with the above-mentioned carbonyl-containing systems can be manipulated in a number of different ways. Depending on the positional relationship between the nitro and carbonyl groups in the cross-coupling product, the reduction of the former group, which can be achieved under a range of different conditions, provides, through intramolecular nucleophilic addition reactions, including Schiff base condensations, access to a diverse range of heterocyclic systems. These include indoles, quinolines, quinolones, isoquinolines, carbazoles, and carbolines. Tandem variants of such cyclization processes, in which Raney cobalt is used as a catalyst for the chemoselective reduction (by dihydrogen) of nitro and nitrile groups (but not olefins), allow for the assembly of a range of structurally challenging natural products, including marinoquinoline A, (±)-1-acetylaspidoalbidine, and (±)-gilbertine.
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Affiliation(s)
- Faiyaz Khan
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Michael Dlugosch
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Xin Liu
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
| | - Martin G. Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, ACT 2601, Australia
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Rhodium-Catalyzed Enantioselective Formal [4+1] Cycloaddition of Diazooxindoles and the Danishefsky Diene. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201700639] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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8
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White LV, Banwell MG. Conversion of the Enzymatically Derived (1S,2S)-3-Bromocyclohexa-3,5-diene-1,2-diol into Enantiomerically Pure Compounds Embodying the Pentacyclic Framework of Vindoline. J Org Chem 2016; 81:1617-26. [PMID: 26788805 DOI: 10.1021/acs.joc.5b02788] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The enzymatically derived and enantiomerically pure (1S,2S)-3-bromocyclohexa-3,5-diene-1,2-diol (7) has been elaborated over 17 steps into compounds 8 and 32, each of which embodies the pentacyclic framework and much of the functionality associated with the alkaloid vindoline (3). This work sets the stage for effecting the conversion of the related metabolite (1S,6R)-5-ethyl-1,6-dihydroxycyclohexa-2,4-diene-1-carboxylic acid (4) into compound 3, the latter being a biogenetic precursor to the clinically significant anticancer agents vinblastine and vincristine.
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Affiliation(s)
- Lorenzo V White
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University , Canberra, ACT 2601, Australia
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University , Canberra, ACT 2601, Australia
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Tong S, Xu Z, Mamboury M, Wang Q, Zhu J. Aqueous Titanium Trichloride Promoted Reductive Cyclization ofo-Nitrostyrenes to Indoles: Development and Application to the Synthesis of Rizatriptan and Aspidospermidine. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505713] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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10
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Tong S, Xu Z, Mamboury M, Wang Q, Zhu J. Aqueous Titanium Trichloride Promoted Reductive Cyclization of
o
‐Nitrostyrenes to Indoles: Development and Application to the Synthesis of Rizatriptan and Aspidospermidine. Angew Chem Int Ed Engl 2015; 54:11809-12. [DOI: 10.1002/anie.201505713] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Revised: 07/12/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Shuo Tong
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL‐SB‐ISIC‐LSPN, BCH 5304, 1015 Lausanne (Switzerland) http://lspn.epfl.ch
| | - Zhengren Xu
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL‐SB‐ISIC‐LSPN, BCH 5304, 1015 Lausanne (Switzerland) http://lspn.epfl.ch
| | - Mathias Mamboury
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL‐SB‐ISIC‐LSPN, BCH 5304, 1015 Lausanne (Switzerland) http://lspn.epfl.ch
| | - Qian Wang
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL‐SB‐ISIC‐LSPN, BCH 5304, 1015 Lausanne (Switzerland) http://lspn.epfl.ch
| | - Jieping Zhu
- Laboratory of Synthesis and Natural Products, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL‐SB‐ISIC‐LSPN, BCH 5304, 1015 Lausanne (Switzerland) http://lspn.epfl.ch
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11
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G. Banwell M, V. White L, C. Willis A. ABC → ABCE/D Based Approaches to the Pentacyclic Ring System of the Vinca Alkaloids Using Intramolecular Hetero-[2+2]cycloaddition and Gold(I)-Catalyzed 6-endo-dig Cyclisation Protocols. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)19] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Doran R, Carroll MP, Akula R, Hogan BF, Martins M, Fanning S, Guiry PJ. A Stereoselective Switch: Enantiodivergent Approach to the Synthesis of Isoflavanones. Chemistry 2014; 20:15354-9. [DOI: 10.1002/chem.201405246] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Indexed: 12/23/2022]
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13
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Gataullin RR. Advances in the synthesis of cycloalka[b]indoles. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2013. [DOI: 10.1134/s1070428013020012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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14
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Sidorova AA, Yaroshenko DV, Murashko EA, Grigor’ev AV. Development of chromatographic and electrophoretic methods for determining vinblastine in blood plasma and prostate gland tissue. JOURNAL OF ANALYTICAL CHEMISTRY 2013. [DOI: 10.1134/s1061934813030118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Turner TC, Shibayama K, Boger DL. Hypervalent iodine(III)-promoted intermolecular C-C coupling of vindoline with β-ketoesters and related substrates. Org Lett 2013; 15:1100-3. [PMID: 23421318 PMCID: PMC3607625 DOI: 10.1021/ol400135n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The regioselective intermolecular coupling reaction of vindoline with a wide range of substrates including β-ketoesters, β-diketones, β-ketoaldehydes, β-ketonitriles, malononitriles, and β-cyanoesters provides an opportunity for the synthesis of vinblastine analogues containing deep-seated changes in the upper velbanamine subunit. The transition-metal-free hypervalent iodine(III)-promoted intermolecular sp(3)/sp(2) coupling, representing a special class of selective C-H activation with direct carbon-carbon bond formation, proceeds with generation of a quaternary center capable of incorporation of the vinblastine C16' methyl ester and functionalized for subsequent divergent heterocycle introduction.
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Affiliation(s)
- Travis C. Turner
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Kotaro Shibayama
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
| | - Dale L. Boger
- Department of Chemistry and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037
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