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Pavunkumar V, Harikrishnan K, Mohanakrishnan AK. Synthesis of Cytotoxic Quino[4,3- b]carbazole Frameworks through an Intramolecular Diels-Alder Reaction. J Org Chem 2024; 89:191-215. [PMID: 38133929 DOI: 10.1021/acs.joc.3c01909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2023]
Abstract
An intramolecular Diels-Alder reaction of positionally isomeric indole-2/3-phenylvinyl-N-alkynylated (N-phenylsulfonyl)amines has been successfully exploited for the synthesis of quino[4,3-b]carbazole and its analogues. This reaction proceeds through a [4 + 2] cycloaddition followed by elimination and deprotection of phenylsulfonyl units to afford the quinocarbazoles in moderate to good yields. The reaction features a broad substrate scope and remarkable functional group forbearance. A preliminary in vitro cytotoxicity evaluation of representative quino[4,3-b]carbazoles was performed against NCI-H460 human cancer cell culture. Among the quino[4,3-b]carbazoles evaluated, five of the fluorine-containing quinocarbazoles displayed nano molar range (0.8-2.0 nm) GI50 values. The UV-vis and fluorescence spectral studies of representative quinocarbazoles were also performed. Like ellipticine, four of the quinocarbazoles displayed dual emissions confirming the existence of p-quinonoid like tautomeric forms in a polar protic solvent.
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Affiliation(s)
- Vinayagam Pavunkumar
- Department of Organic Chemistry, School of Chemical Science, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Kesavan Harikrishnan
- Department of Organic Chemistry, School of Chemical Science, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Arasambattu K Mohanakrishnan
- Department of Organic Chemistry, School of Chemical Science, University of Madras, Guindy Campus, Chennai 600 025, Tamil Nadu, India
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2
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Deng C, Liu Y, Xu M, Xie K, Liu S. Exploiting an intramolecular Diels-Alder cyclization/dehydro-aromatization sequence for the total syntheses of ellipticines and calothrixin B. Org Biomol Chem 2021; 19:1395-1403. [PMID: 33491728 DOI: 10.1039/d0ob02527e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The tetracyclic and pentacyclic skeletons of pyrido and quinolinocarbazole alkaloids have been synthesized via a unified strategy. The prominent key step involved a Diels-Alder intramolecular cyclization/dehydro-aromatization sequence. From these carbazole-lactam cores, linear syntheses have been developed for ellipticines and calothrixin B.
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Affiliation(s)
- Chengdan Deng
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China. and Key Laboratory of Chemistry for Natural Products of Guizhou Province, Chinese Academy of Sciences, Guiyang 550014, China.
| | - Yuancui Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China. and Key Laboratory of Chemistry for Natural Products of Guizhou Province, Chinese Academy of Sciences, Guiyang 550014, China.
| | - Mei Xu
- Key Laboratory of Chemistry for Natural Products of Guizhou Province, Chinese Academy of Sciences, Guiyang 550014, China.
| | - Kaiqiang Xie
- Key Laboratory of Chemistry for Natural Products of Guizhou Province, Chinese Academy of Sciences, Guiyang 550014, China.
| | - Sheng Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China. and Key Laboratory of Chemistry for Natural Products of Guizhou Province, Chinese Academy of Sciences, Guiyang 550014, China.
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3
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Liu Y, Xu M, Xie K, Liu S. Total Synthesis of Calothrixin B
via
an Intramolecular Baylis‐Hillman Cyclization/6π Electrocyclization/Dehydro‐aromatization Sequence and a Specific Oxidative Quinone Formation. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuancui Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Guiyang 550014 PR China
| | - Mei Xu
- Key Laboratory of Chemistry for Natural Products of Guizhou Province Chinese Academy of Sciences Guiyang 550014 China
| | - Kaiqiang Xie
- Key Laboratory of Chemistry for Natural Products of Guizhou Province Chinese Academy of Sciences Guiyang 550014 China
| | - Sheng Liu
- State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Guiyang 550014 PR China
- Key Laboratory of Chemistry for Natural Products of Guizhou Province Chinese Academy of Sciences Guiyang 550014 China
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4
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Butler NM, Bremner JB, Willis AC, Lucantoni L, Avery VM, Keller PA. Desymmetrization Reactions of Indigo with Grignard Reagents for the Synthesis of Selective Antiplasmodial [1H,3′H]-3-Aryl-2,2′-diindol-3′-ones. J Org Chem 2019; 84:11228-11239. [DOI: 10.1021/acs.joc.9b01442] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicholas M. Butler
- School of Chemistry & Molecular Bioscience, Molecular Horizons, University of Wollongong, and Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - John B. Bremner
- School of Chemistry & Molecular Bioscience, Molecular Horizons, University of Wollongong, and Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Anthony C. Willis
- School of Chemistry, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Leonardo Lucantoni
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Brisbane Innovation Park, Don Young Road, Nathan, Queensland 4111, Australia
| | - Vicky M. Avery
- Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Brisbane Innovation Park, Don Young Road, Nathan, Queensland 4111, Australia
| | - Paul A. Keller
- School of Chemistry & Molecular Bioscience, Molecular Horizons, University of Wollongong, and Illawarra Health & Medical Research Institute, Wollongong, New South Wales 2522, Australia
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Janosik T, Rannug A, Rannug U, Wahlström N, Slätt J, Bergman J. Chemistry and Properties of Indolocarbazoles. Chem Rev 2018; 118:9058-9128. [PMID: 30191712 DOI: 10.1021/acs.chemrev.8b00186] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The indolocarbazoles are an important class of nitrogen heterocycles which has evolved significantly in recent years, with numerous studies focusing on their diverse biological effects, or targeting new materials with potential applications in organic electronics. This review aims at providing a broad survey of the chemistry and properties of indolocarbazoles from an interdisciplinary point of view, with particular emphasis on practical synthetic aspects, as well as certain topics which have not been previously accounted for in detail, such as the occurrence, formation, biological activities, and metabolism of indolo[3,2- b]carbazoles. The literature of the past decade forms the basis of the text, which is further supplemented with older key references.
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Affiliation(s)
- Tomasz Janosik
- Research Institutes of Sweden , Bioscience and Materials, RISE Surface, Process and Formulation , SE-151 36 Södertälje , Sweden
| | - Agneta Rannug
- Institute of Environmental Medicine , Karolinska Institutet , SE-171 77 Stockholm , Sweden
| | - Ulf Rannug
- Department of Molecular Biosciences, The Wenner-Gren Institute , Stockholm University , SE-106 91 Stockholm , Sweden
| | | | - Johnny Slätt
- Department of Chemistry, Applied Physical Chemistry , KTH Royal Institute of Technology , SE-100 44 Stockholm , Sweden
| | - Jan Bergman
- Karolinska Institutet , Department of Biosciences and Nutrition , SE-141 83 Huddinge , Sweden
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6
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Park E, Jeon J, Cheon CH. Chemistry of Cyanide Adducts of Aldimines from Aniline Derivatives. CHEM REC 2018; 18:1474-1488. [PMID: 29665280 DOI: 10.1002/tcr.201800005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 03/22/2018] [Indexed: 12/19/2022]
Abstract
The chemistry of hydrogen cyanide adducts of imines is well-developed, but that of cyanide adducts remains unexplored. This is presumably because these cyanide adducts are not stable and thus not readily available in their isolated forms. In this personal account, we present the progress made in our research program towards the development of novel organic transformations utilizing cyanide adducts of imines as key intermediates. We also report the application of these methodologies to the total synthesis of natural products including indole alkaloids.
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Affiliation(s)
- Eunjoon Park
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Jiye Jeon
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Cheol-Hong Cheon
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
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Muthu Ramalingam B, Dhatchana Moorthy N, Chowdhury SR, Mageshwaran T, Vellaichamy E, Saha S, Ganesan K, Rajesh BN, Iqbal S, Majumder HK, Gunasekaran K, Siva R, Mohanakrishnan AK. Synthesis and Biological Evaluation of Calothrixins B and their Deoxygenated Analogues. J Med Chem 2018; 61:1285-1315. [PMID: 29313676 DOI: 10.1021/acs.jmedchem.7b01797] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A series of calothrixin B (2) analogues bearing substituents at the 'E' ring and their corresponding deoxygenated quinocarbazoles lacking quinone unit were synthesized. The cytotoxicities of calothrixins 1, 2, and 15b-p and quinocarbazole analogues were investigated against nine cancer cell lines. The quinocarbazoles 21a and 25a inhibited the catalytic activity of human topoisomerase II. The plasmid DNA cleavage abilities of calothrixins 1, 2, and 15b-p identified compound 15h causing DNA cleavage comparable to that of calothrixin A (1). Calothrixin A (1), 3-fluorocalothrixin 15h and 4-fluoroquinocarbazole 21b induced extensive DNA damage followed by apoptotic cell death. Spectral and plasmid unwinding studies demonstrated an intercalative mode of binding for quinocarbazoles. We identified two promising drug candidates, the 3-fluorocalothrixin B 15h with low toxicity in animal model and its deoxygenated derivative 4-fluoroquinocarbazole 21b as having potent cytotoxicity against NCI-H460 cell line with a GI50 of 1 nM.
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Affiliation(s)
- Bose Muthu Ramalingam
- Department of Organic Chemistry, University of Madras , Guindy Campus, Chennai 600 025, India
| | - Nachiappan Dhatchana Moorthy
- Department of Biochemistry, University of Madras , Guindy Campus, Chennai 600 025, India.,Research and Development Centre, Orchid Pharma Ltd , Sholinganallur, Chennai 600 119, India
| | - Somenath Roy Chowdhury
- Division of Infectious Diseases & Immunology, Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | | | - Elangovan Vellaichamy
- Department of Biochemistry, University of Madras , Guindy Campus, Chennai 600 025, India
| | - Sourav Saha
- Division of Infectious Diseases & Immunology, Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | - Karthikeyan Ganesan
- Research and Development Centre, Orchid Pharma Ltd , Sholinganallur, Chennai 600 119, India
| | - B Navin Rajesh
- Research and Development Centre, Orchid Pharma Ltd , Sholinganallur, Chennai 600 119, India
| | - Saleem Iqbal
- CAS in Crystallography & Biophysics, University of Madras , Chennai 600 025, India
| | - Hemanta K Majumder
- Division of Infectious Diseases & Immunology, Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
| | | | - Ramamoorthy Siva
- School of Bio Sciences and Technology, VIT University , Vellore 632 014, India
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8
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Lee S, Kim KH, Cheon CH. Total Syntheses of Arcyriaflavin A and Calothrixin B Using 2,2′-Bisindole-3-acetic Acid Derivative as a Common Intermediate. Org Lett 2017; 19:2785-2788. [DOI: 10.1021/acs.orglett.7b00687] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sungjong Lee
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Kyung-Hee Kim
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Cheol-Hong Cheon
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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9
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Advances in the Chemistry of Natural and Semisynthetic Topoisomerase I/II Inhibitors. STUDIES IN NATURAL PRODUCTS CHEMISTRY 2017. [DOI: 10.1016/b978-0-444-63929-5.00002-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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10
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Lindsay AC, Leung IKH, Sperry J. Synthesis of the Azepinobisindole Alkaloid Iheyamine A Enabled by a Cross-Mannich Reaction. Org Lett 2016; 18:5404-5407. [DOI: 10.1021/acs.orglett.6b02798] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ashley C. Lindsay
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland 1000, New Zealand
| | - Ivanhoe K. H. Leung
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland 1000, New Zealand
| | - Jonathan Sperry
- School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland 1000, New Zealand
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11
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Transition-Metal-Free Direct Synthesis of Tetra- and Pentacyclic Azaheteroarenes via [3+3] Annulation of Nitroarenes and Benzyl-Type Carbanions Mediated by Silylating Agents. ChemistrySelect 2016. [DOI: 10.1002/slct.201601128] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Norman AR, Norcott P, McErlean CS. Overview of the synthesis of carbazoloquinone natural products. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.07.092] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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14
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Ramkumar N, Nagarajan R. Formal total synthesis of calothrixin B and its N-benzyl analogues. RSC Adv 2015. [DOI: 10.1039/c5ra18120h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
A formal total synthesis of calothrixin B and its N-benzyl analogues has been reported from (2-chlorophenyl)boronic acid, 8-bromophenanthridine-dione and benzylamines.
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15
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Ramkumar N, Nagarajan R. Total synthesis of calothrixin B via sequential Sonogashira coupling/copper-catalyzed oxidative cyclization. Org Biomol Chem 2015; 13:11046-51. [DOI: 10.1039/c5ob01766a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A total synthesis of the antimalarial indolo[3,2-j]phenanthridine alkaloid calothrixin B is reported.
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16
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Dethe DH, Murhade GM. Diversity-Oriented Synthesis of Calothrixins and Ellipticines. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402837] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Mal D, Roy J, Biradha K. Regiodivergent and short total synthesis of calothrixins. Org Biomol Chem 2014; 12:8196-203. [DOI: 10.1039/c4ob01309c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Norcott P, McErlean CSP. Total Synthesis of (-)-Heliespirone A and (+)-Heliespirone C. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402420] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Hatae N, Satoh R, Chiba H, Osaki T, Nishiyama T, Ishikura M, Abe T, Hibino S, Choshi T, Okada C, Toyota E. N-Substituted calothrixin B derivatives inhibited the proliferation of HL-60 promyelocytic leukemia cells. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1061-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Bhosale SM, Momin AA, Kunjir S, Rajamohanan P, Kusurkar RS. Unexpected observations during the total synthesis of calothrixin B–sodium methoxide as a source of hydride. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.10.140] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Kaliyaperumal SA, Banerjee S, U. K. SK. Palladium mediated intramolecular multiple C–X/C–H cross coupling and C–H activation: synthesis of carbazole alkaloids calothrixin B and murrayaquinone A. Org Biomol Chem 2014; 12:6105-13. [DOI: 10.1039/c4ob00493k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Straightforward palladium mediated syntheses of calothrixin B and murrayaquinone A are described.
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Affiliation(s)
| | - Shyamapada Banerjee
- Technology Development Centre
- Custom Pharmaceutical Services
- Dr Reddy's Laboratories Ltd
- Hyderabad, India
| | - Syam Kumar U. K.
- Technology Development Centre
- Custom Pharmaceutical Services
- Dr Reddy's Laboratories Ltd
- Hyderabad, India
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Ramalingam BM, Saravanan V, Mohanakrishnan AK. Synthesis of calothrixins and its analogs using FeCl3-mediated domino reaction protocol. Org Lett 2013; 15:3726-9. [PMID: 23819770 DOI: 10.1021/ol4015738] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A novel one pot synthesis of calothrixin B and its analogs is achieved involving an FeCl3-mediated domino reaction of enamines in dry DMF at reflux. Alternatively, the enamines upon interaction with CuBr2 in DMF at reflux led to the formation of 1-phenylsulfony-2-(2'-nitroaryl)-4-hydroxycarbazole-3-carbaldehydes in excellent yields.
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Affiliation(s)
- Bose Muthu Ramalingam
- Department of Organic Chemistry, School of Chemistry, University of Madras, Guindy Campus Chennai 600 025, Tamil Nadu, India
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24
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Ramkumar N, Nagarajan R. Total Synthesis of Calothrixin A and B via C–H Activation. J Org Chem 2013; 78:2802-7. [DOI: 10.1021/jo302821v] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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25
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Yun XL, Bi WY, Huang JH, Liu Y, Zhang-Negrerie D, Du YF, Zhao K. Synthesis of N-substituted carbazolones from α-iodo enaminones via Pd(0)-catalyzed intramolecular coupling under microwave irradiation. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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26
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Abe T, Ikeda T, Choshi T, Hibino S, Hatae N, Toyata E, Yanada R, Ishikura M. Total Synthesis of Calothrixins A and B by Palladium-Catalyzed Tandem Cyclization/Cross-Coupling Reaction of Indolylborate. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200657] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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27
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Bhosale SM, Gawade RL, Puranik VG, Kusurkar RS. An efficient total synthesis of calothrixin B. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.03.131] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Schmidt AW, Reddy KR, Knölker HJ. Occurrence, Biogenesis, and Synthesis of Biologically Active Carbazole Alkaloids. Chem Rev 2012; 112:3193-328. [PMID: 22480243 DOI: 10.1021/cr200447s] [Citation(s) in RCA: 899] [Impact Index Per Article: 74.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Arndt W. Schmidt
- Department Chemie, Technische Universität Dresden,
Bergstrasse 66, 01069 Dresden, Germany
| | - Kethiri R. Reddy
- Department Chemie, Technische Universität Dresden,
Bergstrasse 66, 01069 Dresden, Germany
| | - Hans-Joachim Knölker
- Department Chemie, Technische Universität Dresden,
Bergstrasse 66, 01069 Dresden, Germany
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29
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Affiliation(s)
- Christopher C. Nawrat
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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30
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Abe T, Ikeda T, Yanada R, Ishikura M. Concise Total Synthesis of Calothrixins A and B. Org Lett 2011; 13:3356-9. [DOI: 10.1021/ol201107a] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takumi Abe
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan, and Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hirokoshingai, Kure, Hiroshima 737-0112, Japan
| | - Toshiaki Ikeda
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan, and Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hirokoshingai, Kure, Hiroshima 737-0112, Japan
| | - Reiko Yanada
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan, and Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hirokoshingai, Kure, Hiroshima 737-0112, Japan
| | - Minoru Ishikura
- Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido 061-0293, Japan, and Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hirokoshingai, Kure, Hiroshima 737-0112, Japan
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31
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Chen Y, Ying W, Harmata M. Oxidation of 4-methoxyanilines to 1,4-benzoquinones using ceric ammonium nitrate (CAN). Tetrahedron Lett 2011; 52:480-482. [PMID: 21516224 PMCID: PMC3079215 DOI: 10.1016/j.tetlet.2010.11.070] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Treatment of substituted 4-methoxyanilines with ceric ammonium nitrate in a 1:1 mixture of water and acetonitrile resulted in formation of 1,4-benzoquinones in acceptable yields.
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Affiliation(s)
- Yugang Chen
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA
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32
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Hibino S, Choshi T, Tohyama S, Matsumoto K, Yamabuki A, Hieda Y, Nobuhiro J. Total Synthesis of Bioactive Indolo[3,2-j]phenanthridine Alkaloid, Calothrixin B. HETEROCYCLES 2010. [DOI: 10.3987/com-10-s(e)11] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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33
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Chapter 5.2: Five-membered ring systems: pyrroles and benzo analogs. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/s0959-6380(09)70010-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Ishikura M, Yamada K. Simple indole alkaloids and those with a nonrearranged monoterpenoid unit. Nat Prod Rep 2009; 26:803-52. [DOI: 10.1039/b820693g] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Guillonneau L, Taddei D, Moody CJ. Synthesis of the Reported Structure of the Bisbenzoquinone Lanciaquinone, Isolated from Maesa lanceolata. Org Lett 2008; 10:4505-8. [DOI: 10.1021/ol801697g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Loic Guillonneau
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - David Taddei
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Christopher J. Moody
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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Janosik T, Wahlström N, Bergman J. Recent progress in the chemistry and applications of indolocarbazoles. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.06.101] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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