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Thobokholt EN, Simonetti SO, Kaufman TS, Larghi EL, Bracca ABJ. Efficient Buchwald-Hartwig and nitrene-mediated five-membered ring closure approaches to the total synthesis of quindoline. Unexpected direct conversion of a nitro group into a phosphazene. RSC Adv 2023; 13:13715-13724. [PMID: 37152581 PMCID: PMC10162371 DOI: 10.1039/d3ra02468g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 04/25/2023] [Indexed: 05/09/2023] Open
Abstract
Two total syntheses of quindoline, which take place through the intermediacy of 3-nitroquinoline derivatives, are reported. The general synthetic sequence involves construction of the latter by mechanochemical condensation of benzaldehydes with 2-amino-nitrostyrene, followed either by reduction of the nitro group of the heterocycle and Buchwald-Hartwig cyclization or by a nitrene-mediated cyclization under solventless conditions. Use of PPh3 to generate the nitrene resulted in the unprecedented formation of a phosphazene in place of quindoline. This unexpected transformation was explained by means of DFT computations.
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Affiliation(s)
- Elida N Thobokholt
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 2000 Rosario Argentina
| | - Sebastián O Simonetti
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 2000 Rosario Argentina
| | - Teodoro S Kaufman
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 2000 Rosario Argentina
| | - Enrique L Larghi
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 2000 Rosario Argentina
| | - Andrea B J Bracca
- Instituto de Química Rosario (IQUIR, CONICET-UNR), Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario Suipacha 531 2000 Rosario Argentina
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Keller M, Sauvageot-Witzku K, Geisslinger F, Urban N, Schaefer M, Bartel K, Bracher F. The ethoxycarbonyl group as both activating and protective group in N-acyl-Pictet-Spengler reactions using methoxystyrenes. A short approach to racemic 1-benzyltetrahydroisoquinoline alkaloids. Beilstein J Org Chem 2021; 17:2716-2725. [PMID: 34804241 PMCID: PMC8576818 DOI: 10.3762/bjoc.17.183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 10/21/2021] [Indexed: 11/26/2022] Open
Abstract
We present a systematic investigation on an improved variant of the N-acyl-Pictet-Spengler condensation for the synthesis of 1-benzyltetrahydroisoquinolines, based on our recently published synthesis of N-methylcoclaurine, exemplified by the total syntheses of 10 alkaloids in racemic form. Major advantages are a) using ω-methoxystyrenes as convenient alternatives to arylacetaldehydes, and b) using the ethoxycarbonyl residue for both activating the arylethylamine precursors for the cyclization reaction, and, as a significant extension, also as protective group for phenolic residues. After ring closure, the ethoxycarbonyl-protected phenols are deprotected simultaneously with the further processing of the carbamate group, either following route A (lithium alanate reduction) to give N-methylated phenolic products, or following route B (treatment with excess methyllithium) to give the corresponding alkaloids with free N-H function. This dual use of the ethoxycarbonyl group shortens the synthetic routes to hydroxylated 1-benzyltetrahydroisoquinolines significantly. Not surprisingly, these ten alkaloids did not show noteworthy effects on TPC2 cation channels and the tumor cell line VCR-R CEM, and did not exhibit P-glycoprotein blocking activity. But due to their free phenolic groups they can serve as valuable intermediates for novel derivatives addressing all of these targets, based on previous evidence for structure-activity relationships in this chemotype.
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Affiliation(s)
- Marco Keller
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University, Butenandtstr. 5–13, 81377 Munich, Germany
| | - Karl Sauvageot-Witzku
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University, Butenandtstr. 5–13, 81377 Munich, Germany
| | - Franz Geisslinger
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University, Butenandtstr. 5–13, 81377 Munich, Germany
| | - Nicole Urban
- Rudolf-Boehm-Institute for Pharmacology and Toxicology, Härtelstr. 16–18, 04107 Leipzig, Germany
| | - Michael Schaefer
- Rudolf-Boehm-Institute for Pharmacology and Toxicology, Härtelstr. 16–18, 04107 Leipzig, Germany
| | - Karin Bartel
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University, Butenandtstr. 5–13, 81377 Munich, Germany
| | - Franz Bracher
- Department of Pharmacy - Center for Drug Research, Ludwig-Maximilians University, Butenandtstr. 5–13, 81377 Munich, Germany
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Zhao Y, Li Y, Wang B, Zhao J, Li L, Luo XD, Zhang H. Total Synthesis of Dactylicapnosines A and B. J Org Chem 2020; 85:13772-13778. [PMID: 33079547 DOI: 10.1021/acs.joc.0c01900] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Dactylicapnosines A and B, two natural products from Dactylicapnos scandens, exhibited potent anti-inflammatory and analgesic activities both in vitro and in vivo. In this paper, we report our second-generation synthesis of dactylicapnosine A and the first total synthesis of dactylicapnosine B. Our synthetic route features acid-induced isomerization of o-quinone (16), Co-mediated regioselective ring contraction of p-quinone (8b), and oxidative methoxylation of enone (18). This modified sequence provides dactylicapnosine A in 14 steps with an overall yield of 12% from a known compound (14a) and also offers opportunities to synthesize dactylicapnosine-like analogues for biological investigations.
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Affiliation(s)
- Yinjiao Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China.,Center for Life Sciences, School of Life Sciences, Yunnan University, Kunming 650091, P. R. China
| | - Yuda Li
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Bei Wang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, P. R. China
| | - Jingfeng Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Liang Li
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Xiao-Dong Luo
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China.,State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, P. R. China
| | - Hongbin Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
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Sun L, Li D, Zhou X, Zhang D, Wang J, He Z, Jiang R, Chen W. General and Catalytic Enantioselective Approach to Isopavine Alkaloids. J Org Chem 2017; 82:12899-12907. [PMID: 29083182 DOI: 10.1021/acs.joc.7b02385] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A concise, versatile, and catalytic enantioselective approach to natural and non-natural isopavine alkaloids has been developed. The synthesis takes advantage of catalytic asymmetric reaction to construct the pivotal stereogenic center in a highly enantioselective way (95-98% ee), and features use of intramolecular Pictet-Spengler reaction to build the core tetracyclic skeleton in a rapid and stereoselective fashion.
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Affiliation(s)
- Lingyu Sun
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
| | - Da Li
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
| | - Xiaowei Zhou
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
| | - Dongxu Zhang
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
| | - Jin Wang
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
| | - Zhongjing He
- Medical School, Xi'an Peihua University , 2 Baisha Road, Xi'an 710000, P.R. China
| | - Ru Jiang
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
| | - Weiping Chen
- School of Pharmacy, The Fourth Military Medical University , 169 Changle West Road, Xi'an 710032, P.R. China
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Viira B, Selyutina A, García-Sosa AT, Karonen M, Sinkkonen J, Merits A, Maran U. Design, discovery, modelling, synthesis, and biological evaluation of novel and small, low toxicity s-triazine derivatives as HIV-1 non-nucleoside reverse transcriptase inhibitors. Bioorg Med Chem 2016; 24:2519-2529. [PMID: 27108399 DOI: 10.1016/j.bmc.2016.04.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Revised: 03/10/2016] [Accepted: 04/08/2016] [Indexed: 11/15/2022]
Abstract
A set of top-ranked compounds from a multi-objective in silico screen was experimentally tested for toxicity and the ability to inhibit the activity of HIV-1 reverse transcriptase (RT) in cell-free assay and in cell-based assay using HIV-1 based virus-like particles. Detailed analysis of a commercial sample that indicated specific inhibition of HIV-1 reverse transcription revealed that a minor component that was structurally similar to that of the main compound was responsible for the strongest inhibition. As a result, novel s-triazine derivatives were proposed, modelled, discovered, and synthesised, and their antiviral activity and cellular toxicity were tested. Compounds 18a and 18b were found to be efficient HIV-1 RT inhibitors, with an IC50 of 5.6±1.1μM and 0.16±0.05μM in a cell-based assay using infectious HIV-1, respectively. Compound 18b also had no detectable toxicity for different human cell lines. Their binding mode and interactions with the RT suggest that there was strong and adaptable binding in a tight (NNRTI) hydrophobic pocket. In summary, this iterative study produced structural clues and led to a group of non-toxic, novel compounds to inhibit HIV-RT with up to nanomolar potency.
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Affiliation(s)
- Birgit Viira
- Institute of Chemistry, University of Tartu, Tartu 50411, Estonia
| | | | | | - Maarit Karonen
- Department of Chemistry, University of Turku, FI-20014 Turku, Finland
| | - Jari Sinkkonen
- Department of Chemistry, University of Turku, FI-20014 Turku, Finland
| | - Andres Merits
- Institute of Technology, University of Tartu, Tartu 50411, Estonia.
| | - Uko Maran
- Institute of Chemistry, University of Tartu, Tartu 50411, Estonia.
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Koc ZE, Uysal A. Investigation of novel monopodal and dipodal oxy-Schiff base triazine from cyanuric chloride: Structural and antimicrobial studies. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2016. [DOI: 10.1080/10601325.2016.1121060] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ballini R, Petrini M. The Nitro to Carbonyl Conversion (Nef Reaction): New Perspectives for a Classical Transformation. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500008] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Kolarovic A, Käslin A, Wennemers H. Stereoselective Synthesis of Indolines via Organocatalytic Thioester Enolate Addition Reactions. Org Lett 2014; 16:4236-9. [DOI: 10.1021/ol501936n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Andrej Kolarovic
- ETH Zürich, Laboratorium für Organische Chemie, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Alexander Käslin
- ETH Zürich, Laboratorium für Organische Chemie, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
| | - Helma Wennemers
- ETH Zürich, Laboratorium für Organische Chemie, Vladimir-Prelog-Weg 3, CH-8093 Zürich, Switzerland
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Naveen T, Maity S, Sharma U, Maiti D. A Predictably Selective Nitration of Olefin with Fe(NO3)3 and TEMPO. J Org Chem 2013; 78:5949-54. [DOI: 10.1021/jo400598p] [Citation(s) in RCA: 104] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Togati Naveen
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Soham Maity
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Upendra Sharma
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Debabrata Maiti
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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In J, Hwang S, Kim C, Seo JH, Kim S. Synthesis of 3,4-Dihydroisoquinolin-1-ones fromN-Boc-(β-Arylethyl)carbamates via Isocyanate Intermediates. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201408] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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