1
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Mendoza M, Rao N, Tran U, Castaneda C, Billingsley KL. The total synthesis of (−)-indolactam I. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.04.069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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2
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Abstract
A unified and modular approach to the teleocidin B family of natural products is presented that proceeds in 11 steps and features an array of interesting strategies and methods. Indolactam V, the known biosynthetic precursor to this family, was accessed through electrochemical amination, Cu-mediated aziridine opening, and a remarkable base-induced macrolactamization. Guided by a desire to minimize concession steps, the tactical combination of C-H borylation and a Sigman-Heck transform enabled the convergent, stereocontrolled synthesis of the teleocidins.
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Affiliation(s)
- Hugh Nakamura
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United states
| | - Kosuke Yasui
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United states
| | - Yuzuru Kanda
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United states
| | - Phil S. Baran
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United states
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3
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Hobson C, Perryman MS, Kirby G, Clarkson GJ, Fox DJ. Synthesis of enantiomerically-enriched N-aryl amino-amides via a Jocic-type reaction. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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4
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Stein J, Stahn S, Neudörfl JM, Sperlich J, Schmalz HG, Teusch N. Synthetic Indolactam V Analogues as Inhibitors of PAR2-Induced Calcium Mobilization in Triple-Negative Breast Cancer Cells. ChemMedChem 2018; 13:147-154. [PMID: 29195005 DOI: 10.1002/cmdc.201700640] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 11/30/2017] [Indexed: 02/03/2023]
Abstract
Human proteinase-activated receptor 2 (PAR2), a transmembrane G-protein-coupled receptor (GPCR), is an attractive target for a novel anticancer therapy, as it plays a critical role in cell migration and invasion. Selective PAR2 inhibitors therefore have potential as anti-metastatic drugs. Knowing that the natural product teleocidin A2 is able to inhibit PAR2 in tumor cells, the goal of the present study was to elaborate structure-activity relationships and to identify potent PAR2 inhibitors with lower activity against the adverse target, protein kinase C (PKC). For this purpose, an efficient gram-scale total synthesis of indolactam V (i.e., the parent structure of all teleocidins) was developed, and a library of derivatives was prepared. Some compounds were indeed found to exhibit high potency as PAR2 inhibitors at low nanomolar concentrations with improved selectivity (relative to teleocidin A2). The pseudopeptidic fragment bridging the C3 and C4 positions of the indole core proved to be essential for target binding, whereas activity and target selectivity depends on the substituents at N1 or C7. This study revealed novel derivatives that show high efficacy in PAR2 antagonism combined with increased selectivity.
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Affiliation(s)
- Jan Stein
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939, Köln, Germany
| | - Sonja Stahn
- Technische Hochschule Köln, Bio-Pharmaceutical Chemistry & Molecular Pharmacology, Faculty of Applied Natural Sciences, Kaiser-Wilhelm-Allee, G. E39, 51373, Leverkusen, Germany
| | - Jörg-M Neudörfl
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939, Köln, Germany
| | - Julia Sperlich
- Technische Hochschule Köln, Bio-Pharmaceutical Chemistry & Molecular Pharmacology, Faculty of Applied Natural Sciences, Kaiser-Wilhelm-Allee, G. E39, 51373, Leverkusen, Germany
| | - Hans-Günther Schmalz
- University of Cologne, Department of Chemistry, Greinstrasse 4, 50939, Köln, Germany
| | - Nicole Teusch
- Technische Hochschule Köln, Bio-Pharmaceutical Chemistry & Molecular Pharmacology, Faculty of Applied Natural Sciences, Kaiser-Wilhelm-Allee, G. E39, 51373, Leverkusen, Germany
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5
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Johnson TC, Siegel D. Directing Stem Cell Fate: The Synthetic Natural Product Connection. Chem Rev 2017; 117:12052-12086. [PMID: 28771328 DOI: 10.1021/acs.chemrev.7b00015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Stem cells possess remarkable potential for the treatment of a broad array of diseases including many that lack therapeutic options. However, the use of cell-based products derived from stem cells as therapeutics has limitations including rejection, sufficient availability, and lack of appropriate engraftment. Chemical control of stem cells provides potential solutions for overcoming many of the current limitations in cell-based therapeutics. The development of exogenous molecules to control stem cell self-renewal or differentiation has arrived at natural product-based agents as an important class of modulators. The ex vivo production of cryopreserved cellular products for use in tissue repair is a relatively new area of medicine in which the conventional hurdles to implementing chemicals to effect human health are changed. Translational challenges centered on chemistry, such as pharmacokinetics, are reduced. Importantly, in many cases the desired human tissues can be evaluated against new chemicals, and approaches to cellular regulation can be validated in the clinically applicable system. As a result linking new and existing laboratory syntheses of natural products with findings of the compounds' unique abilities to regulate stem cell fate provides opportunities for developing improved methods for tissue manufacture, accessing probe compounds, and generating new leads that yield manufactured cells with improved properties. This review provides a summary of natural products that have shown promise in controlling stem cell fate and which have also been fully synthesized thereby providing chemistry platforms for further development.
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Affiliation(s)
- Trevor C Johnson
- Department of Chemistry and Biochemistry, University of California, San Diego , La Jolla, California 92093, United States
| | - Dionicio Siegel
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego , La Jolla, California 92093, United States
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6
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Lanke V, Prabhu KR. Iridium(iii) catalyzed regioselective amidation of indoles at the C4-position using weak coordinating groups. Chem Commun (Camb) 2017; 53:5117-5120. [DOI: 10.1039/c7cc00763a] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The C4-aminated indole scaffold is frequently encountered in several natural products and biologically active compounds.
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Affiliation(s)
- Veeranjaneyulu Lanke
- Department of Organic Chemistry
- Indian Institute of Science
- Bangalore 560 012
- India
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7
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Haynes-Smith J, Diaz I, Billingsley KL. Modular Total Synthesis of Protein Kinase C Activator (-)-Indolactam V. Org Lett 2016; 18:2008-11. [PMID: 27074538 DOI: 10.1021/acs.orglett.6b00614] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise, eight-step total synthesis of (-)-indolactam V, a nanomolar agonist of protein kinase C, is reported. The synthesis relies upon an efficient copper-catalyzed amino acid arylation to establish the indole C4-nitrogen bond. This cross-coupling method is applicable to a range of hydrophobic amino acids, providing a platform for further diversification of indolactam alkaloid scaffolds and studies on their potent biological activity.
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Affiliation(s)
- Jeremy Haynes-Smith
- Department of Chemistry and Biochemistry, San Francisco State University , San Francisco, California 94132, United States
| | - Italia Diaz
- Department of Chemistry and Biochemistry, San Francisco State University , San Francisco, California 94132, United States
| | - Kelvin L Billingsley
- Department of Chemistry and Biochemistry, San Francisco State University , San Francisco, California 94132, United States
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8
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9
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Sharma KK, Sharma S, Kudwal A, Jain R. Room temperature N-arylation of amino acids and peptides using copper(i) and β-diketone. Org Biomol Chem 2015; 13:4637-41. [DOI: 10.1039/c5ob00288e] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A mild and efficient Cu-catalyzed procedure for the N-arylation of zwitterionic amino acids, amino acid esters and peptides is described.
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Affiliation(s)
- Krishna K. Sharma
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - Swagat Sharma
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - Anurag Kudwal
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
| | - Rahul Jain
- Department of Medicinal Chemistry
- National Institute of Pharmaceutical Education and Research
- S. A. S. Nagar
- India
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10
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Nathel NFF, Shah TK, Bronner SM, Garg NK. Total syntheses of indolactam alkaloids (-)-indolactam V, (-)-pendolmycin, (-)-lyngbyatoxin A, and (-)-teleocidin A-2. Chem Sci 2014; 5:2184-2190. [PMID: 24839542 DOI: 10.1039/c4sc00256c] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the total syntheses of (-)-indolactam V and the C7-substituted indolactam alkaloids (-)-pendolmycin, (-)-lyngbyatoxin A, and (-)-teleocidin A-2. The strategy for preparing indolactam V relies on a distortion-controlled indolyne functionalization reaction to establish the C4-N linkage, in addition to an intramolecular conjugate addition to build the conformationally-flexible nine-membered ring. The total synthesis of indolactam V then sets the stage for the divergent synthesis of the other targeted alkaloids. Specifically, late-stage sp2-sp3 cross-couplings on an indolactam V derivative are used to introduce the key C7 substituents and the necessary quaternary carbons. These challenging couplings, in addition to other delicate manipulations, all proceed in the presence of a basic tertiary amine, an unprotected secondary amide, and an unprotected indole. Thus, our approach not only enables the enantiospecific total syntheses of four indolactam alkaloids, but also serves as a platform for probing complexity-generating and chemoselective transformations in the context of alkaloid total synthesis.
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Affiliation(s)
- Noah F Fine Nathel
- Department of Chemistry and Biochemistry, University of California, 607 Charles Young Drive East, Box 951569, Los Angeles, CA 90095, USA
| | - Tejas K Shah
- Department of Chemistry and Biochemistry, University of California, 607 Charles Young Drive East, Box 951569, Los Angeles, CA 90095, USA
| | - Sarah M Bronner
- Department of Chemistry and Biochemistry, University of California, 607 Charles Young Drive East, Box 951569, Los Angeles, CA 90095, USA
| | - Neil K Garg
- Department of Chemistry and Biochemistry, University of California, 607 Charles Young Drive East, Box 951569, Los Angeles, CA 90095, USA
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11
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Liu Q, Li Q, Ma Y, Jia Y. Direct Olefination at the C-4 Position of Tryptophan via C–H Activation: Application to Biomimetic Synthesis of Clavicipitic Acid. Org Lett 2013; 15:4528-31. [DOI: 10.1021/ol4020877] [Citation(s) in RCA: 139] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Qiang Liu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Media, Chinese Academy of Sciences, Shanghai 201203, China
| | - Qingjiang Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Media, Chinese Academy of Sciences, Shanghai 201203, China
| | - Yongfan Ma
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Media, Chinese Academy of Sciences, Shanghai 201203, China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China, and State Key Laboratory of Drug Research, Shanghai Institute of Materia Media, Chinese Academy of Sciences, Shanghai 201203, China
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12
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Mari M, Bartoccini F, Piersanti G. Synthesis of (−)-Epi-Indolactam V by an Intramolecular Buchwald–Hartwig C–N Coupling Cyclization Reaction. J Org Chem 2013; 78:7727-34. [DOI: 10.1021/jo4013767] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michele Mari
- Department of Biomolecular
Sciences, University of Urbino “Carlo Bo”, Piazza del Rinascimento
6, 61029 Urbino (PU), Italy
| | - Francesca Bartoccini
- Department of Biomolecular
Sciences, University of Urbino “Carlo Bo”, Piazza del Rinascimento
6, 61029 Urbino (PU), Italy
| | - Giovanni Piersanti
- Department of Biomolecular
Sciences, University of Urbino “Carlo Bo”, Piazza del Rinascimento
6, 61029 Urbino (PU), Italy
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13
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Pandey R, Gupta RK, Shahid M, Maiti B, Misra A, Pandey DS. Synthesis and Characterization of Electroactive Ferrocene Derivatives: Ferrocenylimidazoquinazoline as a Multichannel Chemosensor Selectively for Hg2+ and Pb2+ Ions in an Aqueous Environment. Inorg Chem 2011; 51:298-311. [DOI: 10.1021/ic201663m] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Rampal Pandey
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi
221
005 (U.P.), India
| | - Rakesh Kumar Gupta
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi
221
005 (U.P.), India
| | - Mohammad Shahid
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi
221
005 (U.P.), India
| | - Biswajit Maiti
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi
221
005 (U.P.), India
| | - Arvind Misra
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi
221
005 (U.P.), India
| | - Daya Shankar Pandey
- Department of Chemistry, Faculty
of Science, Banaras Hindu University, Varanasi
221
005 (U.P.), India
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15
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Bronner SM, Goetz AE, Garg NK. Overturning indolyne regioselectivities and synthesis of indolactam V. J Am Chem Soc 2011; 133:3832-5. [PMID: 21351773 PMCID: PMC3060274 DOI: 10.1021/ja200437g] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the design and synthesis of an indolyne that displays a reversal in regioselectivity, in both nucleophilic addition and cycloaddition reactions, compared to typical 4,5-indolynes. Our approach utilizes simple computations to predict regioselectivity in reactions of unsymmetrical arynes. With this methodology, novel benzenoid-substituted indoles can be accessed with significant regiocontrol. Furthermore, the technology provides an unconventional tactic for the synthesis of C4-substituted indole alkaloids, as demonstrated by a synthesis of indolactam V.
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Affiliation(s)
- Sarah M Bronner
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
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17
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18
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Daşkapan T, Koca S. Highly efficient catalytic system for electrophilic amination of arylzinc reagents. Appl Organomet Chem 2009. [DOI: 10.1002/aoc.1574] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Narendar N, Velmathi S. Copper-catalyzed C–N coupling reactions of aryl halides with α-amino acids under focused microwave irradiation. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.06.122] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Ishikawa T, Kurokawa M, Nakanishi W. Copper(I) Iodide-Catalyzed Coupling Reaction of Haloindoles with α-Amino Acids. HETEROCYCLES 2007. [DOI: 10.3987/com-06-10985] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Xu LW, Xia CG, Li JW, Li FW, Zhou SL. Efficient palladium/copper cocatalyzed C–N coupling reaction of unactivated aryl bromide or iodide with amino acid under microwave heating. CATAL COMMUN 2004. [DOI: 10.1016/j.catcom.2003.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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22
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Pyun DK, Lee CH, Ha HJ, Park CS, Chang JW, Lee WK. Synthesis of substituted-(l)-tryptophanols from an enantiomerically pure aziridine-2-methanol. Org Lett 2001; 3:4197-9. [PMID: 11784176 DOI: 10.1021/ol016861+] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Enantiomerically pure (l)-tryptophanol (5) was synthesized from 4(R)-iodomethyl-2-oxazolidinone (2) and indolylmagnesium bromide in three steps (52% overall yield). Using this procedure, we also prepared various tryptophanols with substituent(s) on the indole ring. Furthermore, optically active 4(R)-iodomethyl-2-oxazolidinone was readily prepared from an enantiomerically pure aziridine-2(S)-methanol in high yield. [reaction: see text]
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Affiliation(s)
- D K Pyun
- Department of Chemistry, Sogang University, Seoul 121-742, Korea
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23
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A convenient preparation of 4-iodoindoles from indoles: application to the chemical synthesis of hapalindole alkaloids. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02194-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ma D, Zhang Y, Yao J, Wu S, Tao F. Accelerating Effect Induced by the Structure of α-Amino Acid in the Copper-Catalyzed Coupling Reaction of Aryl Halides with α-Amino Acids. Synthesis of Benzolactam-V8. J Am Chem Soc 1998. [DOI: 10.1021/ja981662f] [Citation(s) in RCA: 405] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dawei Ma
- Contribution from the State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, 354 Fenglin Lu, Shanghai 200032, China, and the Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Yongda Zhang
- Contribution from the State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, 354 Fenglin Lu, Shanghai 200032, China, and the Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Jiangchao Yao
- Contribution from the State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, 354 Fenglin Lu, Shanghai 200032, China, and the Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Shihui Wu
- Contribution from the State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, 354 Fenglin Lu, Shanghai 200032, China, and the Department of Chemistry, Fudan University, Shanghai 200433, China
| | - Fenggang Tao
- Contribution from the State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, 354 Fenglin Lu, Shanghai 200032, China, and the Department of Chemistry, Fudan University, Shanghai 200433, China
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Dawei Ma, Jiangchao Yao. Synthesis of chiral N-aryl-α-amino acids by PdCu catalyzed couplings of chiral α-amino acids with aryl halides. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0957-4166(96)00401-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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Kang SK, Lee HW, Choi WK, Hong RK, Kim JS. Palladium-Catalyzed Synthesis of Arylamines from Diphenyliodonium Tetrafluoroborate and Secondary Amine. SYNTHETIC COMMUN 1996. [DOI: 10.1080/00397919608004660] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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30
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Arylation of amines and alcohols catalyzed by nickel, copper or palladium complexes. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/s0926-9614(96)80012-8] [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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31
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Protein kinase C modulators. Indolactams. 1. Efficient and flexible routes for the preparation of (-)-indolactam V for use in the synthesis of analogs. Tetrahedron Lett 1994. [DOI: 10.1016/s0040-4039(00)78433-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Goti A, Semmelhack MF. Direct synthesis of (η6-arene)-tricarbonylchromium complexes by arene displacement from tricarbonyl(η5-1-methylpyrrole)chromium(0). J Organomet Chem 1994. [DOI: 10.1016/0022-328x(94)80181-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Semmelhack M, Knochel P, Singleton T. A new approach to indole alkaloids via indole chromium complexes. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)60673-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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