1
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Sekar P, Gupta A, English LE, Rabbitt CE, Male L, Jupp AR, Davies PW. Regiodivergent Synthesis of 4- and 5-Sulfenyl Oxazoles from Alkynyl Thioethers. Chemistry 2024; 30:e202401465. [PMID: 38743746 DOI: 10.1002/chem.202401465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/11/2024] [Accepted: 05/13/2024] [Indexed: 05/16/2024]
Abstract
The regiodivergent synthesis of 4- and 5-sulfenyl oxazoles from 1,4,2-dioxazoles and alkynyl thioethers has been achieved. Gold-catalysed conditions are used to favour the formation of 5-sulfenyl oxazoles via β-selective attack of the nitrenoid relative to the sulfenyl group. In contrast, 4-sulfenyl oxazoles are formed by α-selective reaction under Brønsted acid conditions from the same substrates. The nature of stabilising gold-sulfur interactions have been investigated by natural bond orbital analysis, showing that the S→Au interactions are significantly stronger in the intermediate that favours the 5-sulfenyl oxazoles. A kinetic survey identifies catalyst inhibition processes. This study into the regiodivergent methods includes the development of telescoped annulation-oxidation protocols for regioselective access to oxazole sulfoxides and sulfones.
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Affiliation(s)
- Prakash Sekar
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Aniket Gupta
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Laura E English
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Clare E Rabbitt
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Louise Male
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Andrew R Jupp
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Paul W Davies
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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2
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Xue F, Yang CJ, Tang T, He Z. Sequential annulation and isomerisation reaction of 3-acylmethylidene oxindoles with Huisgen zwitterions and synthesis of 5-(3-oxindolyl)oxazoles. Org Biomol Chem 2023; 21:8176-8181. [PMID: 37786314 DOI: 10.1039/d3ob01199b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Herein, we report a facile synthesis of 5-(3-oxindolyl)oxazole derivatives via a sequential annulation and isomerisation reaction of 3-acylmethylidene oxindoles with in situ generated Huisgen zwitterions (HZs) from PPh3 and azodicarboxylates. This reaction exhibits good functional group tolerance with 30 examples of structurally diverse products prepared with moderate to good efficiencies (up to 88% yield), thus providing a generally applicable route to the biologically important 5-(3-indolyl)oxazole structural motifs. Key to the success of this sequential one-pot strategy is the utilization of DBU as a base to promote the isomerisation process of the corresponding intermediate annulation products.
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Affiliation(s)
- Feixue Xue
- The State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China.
| | - Chang-Jiang Yang
- Department of Chemistry, School of Sciences, Great Bay University, Dongguan 523000, China
- The Dongguan Key Laboratory for Data Science and Intelligent Medicine, Dongguan 523000, China.
| | - Tong Tang
- The State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China.
| | - Zhengjie He
- The State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China.
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3
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Savelson E, Tepe JJ. One-Pot Friedel-Crafts/Robinson-Gabriel Synthesis of the Indole-Oxazole Scaffold and Its Application to the Synthesis of Breitfussins C, G, and H. J Org Chem 2023; 88:755-761. [PMID: 35235750 DOI: 10.1021/acs.joc.2c00033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The indole-oxazole scaffold is found in a range of biologically active natural products, including the breitfussin family. Divergent methods that provide access to the indole-oxazole template are relatively scarce, which impedes the wider exploration of these natural products and their exciting biological activity. Herein, we describe a highly divergent synthesis of the indole-oxazole scaffold via a one-pot Friedel-Crafts/Robinson-Gabriel synthesis and the application of this methodology to the synthesis of breitfussins C, G, and H.
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Affiliation(s)
- Evan Savelson
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48823, United States
| | - Jetze J Tepe
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48823, United States
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4
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Gribble GW. Naturally Occurring Organohalogen Compounds-A Comprehensive Review. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2023; 121:1-546. [PMID: 37488466 DOI: 10.1007/978-3-031-26629-4_1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
The present volume is the third in a trilogy that documents naturally occurring organohalogen compounds, bringing the total number-from fewer than 25 in 1968-to approximately 8000 compounds to date. Nearly all of these natural products contain chlorine or bromine, with a few containing iodine and, fewer still, fluorine. Produced by ubiquitous marine (algae, sponges, corals, bryozoa, nudibranchs, fungi, bacteria) and terrestrial organisms (plants, fungi, bacteria, insects, higher animals) and universal abiotic processes (volcanos, forest fires, geothermal events), organohalogens pervade the global ecosystem. Newly identified extraterrestrial sources are also documented. In addition to chemical structures, biological activity, biohalogenation, biodegradation, natural function, and future outlook are presented.
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Affiliation(s)
- Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.
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5
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Ding R, Cui H, Zhu Y, Zhou Y, Tao H, Mai S. Domino Sonogashira coupling/metal carbene-involved annulation enabled by Pd/Cu relay catalysis: rapid assembly of indazole-containing biheteroaryls. Org Chem Front 2023. [DOI: 10.1039/d3qo00367a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
An efficient and novel method has been developed for the synthesis of indazole-containing biheteroaryls via a domino Sonogashira coupling/azaenyne cycloisomerization/Barton–Kellogg reaction.
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6
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Zhang Y, Li W, Jiang R, Zhang L, Li Y, Xu X, Liu X. Synthetic Doping of Acenaphthylene through BN/CC Isosterism and a Direct Comparison with BN-Acenaphthene. J Org Chem 2022; 87:12986-12996. [PMID: 36149831 DOI: 10.1021/acs.joc.2c01534] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Boron/nitrogen-doped acenaphthylenes, a new class of BN-doped cyclopenta-fused polycyclic aromatic hydrocarbons, were synthesized via indole-directed C-H borylation. The reference molecule BN-acenaphthene was also synthesized in a similar manner. Both BN-acenaphthylene and BN-acenaphthene were unequivocally characterized by single-crystal X-ray analysis. The aromaticities of each ring in BN-acenaphthylenes were quantified by experimental and theoretical methods. Moreover, doping the BN unit into acenaphthylene can increase the LUMO level and decrease the HOMO level, resulting in wider HOMO-LUMO energy gaps. Furthermore, regioselective bromination of BN-acenaphthylene (B-Mes) afforded monobrominated BN-acenaphthylene in good yield. Subsequently, cross-coupling of brominated BN-acenaphthylene gave a series of BN-acenaphthylene derivatives. In addition, the photophysical properties of these BN-acenaphthylene derivatives can be fine-tuned by the substituents on the BN-acenaphthylene scaffold.
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Affiliation(s)
- Yanli Zhang
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China
| | - Wenlong Li
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China
| | - Ruijun Jiang
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China
| | - Lei Zhang
- School of Science, Tianjin Chengjian University, Tianjin 300384, People's Republic of China
| | - Yuanhao Li
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China
| | - Xiaoyang Xu
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China
| | - Xuguang Liu
- School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People's Republic of China.,State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, People's Republic of China
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7
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Godfrey RC, Jones HE, Green NJ, Lawrence AL. Unified total synthesis of the brevianamide alkaloids enabled by chemical investigations into their biosynthesis. Chem Sci 2022; 13:1313-1322. [PMID: 35222915 PMCID: PMC8809396 DOI: 10.1039/d1sc05801k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 12/27/2021] [Indexed: 01/08/2023] Open
Abstract
The bicyclo[2.2.2]diazaoctane alkaloids are a vast group of natural products which have been the focus of attention from the scientific community for several decades. This interest stems from their broad range of biological activities, their diverse biosynthetic origins, and their topologically complex structures, which combined make them enticing targets for chemical synthesis. In this article, full details of our synthetic studies into the chemical feasibility of a proposed network of biosynthetic pathways towards the brevianamide family of bicyclo[2.2.2]diazaoctane alkaloids are disclosed. Insights into issues of reactivity and selectivity in the biosynthesis of these structures have aided the development of a unified biomimetic synthetic strategy, which has resulted in the total synthesis of all known bicyclo[2.2.2]diazaoctane brevianamides and the anticipation of an as-yet-undiscovered congener.
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Affiliation(s)
- Robert C Godfrey
- EaStCHEM School of Chemistry, University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
| | - Helen E Jones
- EaStCHEM School of Chemistry, University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
| | - Nicholas J Green
- EaStCHEM School of Chemistry, University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
| | - Andrew L Lawrence
- EaStCHEM School of Chemistry, University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
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8
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Mao Z, Zeng H. Gold-catalyzed synthesis of oxazoles from alkynyl triazenes and dioxazoles. RSC Adv 2022; 12:24857-24860. [PMID: 36128381 PMCID: PMC9428897 DOI: 10.1039/d2ra04559a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 08/25/2022] [Indexed: 11/21/2022] Open
Abstract
A gold-catalyzed regioselective [3 + 2] cycloaddition of alkynyl triazenes with 1,2,4-dioxazoles was developed.
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Affiliation(s)
- Zhenjun Mao
- Department of Chemistry, Zhejiang University, Hangzhou 310058, China
| | - Hao Zeng
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China
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9
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Xin HL, Rao X, Ishitani H, Kobayashi S. Sequential Continuous-Flow Synthesis of 3-Aryl Benzofuranones. Chem Asian J 2021; 16:1906-1910. [PMID: 34137489 DOI: 10.1002/asia.202100461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/27/2021] [Indexed: 01/01/2023]
Abstract
A sequential continuous-flow system to produce 3-aryl benzofuranones was developed. Starting from 2,4-di-tert-butylphenol and glyoxylic acid monohydrate, both the initial cyclocondensation and the subsequent Friedel-Crafts alkylation were catalyzed by the same heterogeneous catalyst, Amberlyst-15H. The catalyst has a promising life-time for these two steps, and it was able to be recovered and reused for several runs without deactivation. By using the established flow system, 5,7-di-tert-butyl-3-(3,4-dimethylphenyl)-3H-benzofuran-2-one (Irganox HP-136), which is a commercial antioxidant, was prepared in 88% two-step yield. Reactions with various aromatic compounds proceeded well under flow conditions to afford 3-aryl benzo-furanone derivatives in high yields with good functional group compatibility.
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Affiliation(s)
- Hai-Long Xin
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
| | - Xiaofeng Rao
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
| | - Haruro Ishitani
- Green & Sustainable Chemistry Social Cooperation Laboratory, Graduate School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
| | - Shū Kobayashi
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan.,Green & Sustainable Chemistry Social Cooperation Laboratory, Graduate School of Science, The University of Tokyo, Hongo, 113-0033, Bunkyo-ku, Tokyo, Japan
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10
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Kondo M, Matsuyama N, Aye TZ, Mattan I, Sato T, Makita Y, Ishibashi M, Arai MA, Takizawa S, Sasai H. Practical Stereoselective Synthesis of C3‐Spirooxindole‐ and C2‐Spiropseudoindoxyl‐Pyrrolidines
via
Organocatalyzed Pictet‐Spengler Reaction/Oxidative Rearrangement Sequence. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Masaru Kondo
- The Institute of Scientific and Industrial Research (ISIR) Osaka University Mihogaoka, Ibaraki-shi Osaka 567-0047 Japan
| | - Naoki Matsuyama
- The Institute of Scientific and Industrial Research (ISIR) Osaka University Mihogaoka, Ibaraki-shi Osaka 567-0047 Japan
| | - Tin Z. Aye
- The Institute of Scientific and Industrial Research (ISIR) Osaka University Mihogaoka, Ibaraki-shi Osaka 567-0047 Japan
| | - Irshad Mattan
- The Institute of Scientific and Industrial Research (ISIR) Osaka University Mihogaoka, Ibaraki-shi Osaka 567-0047 Japan
| | - Tomoyuki Sato
- Graduate School of Pharmaceutical Sciences Chiba University 1-8-1 Inohana, Chuo-ku Chiba 260-8675 Japan
| | - Yoshinori Makita
- Graduate School of Pharmaceutical Sciences Chiba University 1-8-1 Inohana, Chuo-ku Chiba 260-8675 Japan
- Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama Kanagawa 223–8522 Japan
| | - Masami Ishibashi
- Graduate School of Pharmaceutical Sciences Chiba University 1-8-1 Inohana, Chuo-ku Chiba 260-8675 Japan
| | - Midori A. Arai
- Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama Kanagawa 223–8522 Japan
| | - Shinobu Takizawa
- The Institute of Scientific and Industrial Research (ISIR) Osaka University Mihogaoka, Ibaraki-shi Osaka 567-0047 Japan
- Artificial Intelligence Research Center, ISIR Osaka University
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial Research (ISIR) Osaka University Mihogaoka, Ibaraki-shi Osaka 567-0047 Japan
- Artificial Intelligence Research Center, ISIR Osaka University
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11
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Tang S, Vincent G. Natural Products Originated from the Oxidative Coupling of Tyrosine and Tryptophan: Biosynthesis and Bioinspired Synthesis. Chemistry 2021; 27:2612-2622. [PMID: 32820845 DOI: 10.1002/chem.202003459] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 08/17/2020] [Indexed: 12/18/2022]
Abstract
The oxidative coupling of tyrosine and tryptophan units is a pivotal step in the total synthesis of some peptide-derived marine and terrestrial natural products, such as the diazonamides, azonazine and tryptorubin A. This Minireview details the biosynthesis and bioinspired synthesis of natural products with such structures. A special focus is put on the challenges of the synthesis of these natural products and the innovative solutions adopted by synthetic chemists.
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Affiliation(s)
- Shanyu Tang
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Saclay, CNRS, 91405, Orsay, France
| | - Guillaume Vincent
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Saclay, CNRS, 91405, Orsay, France
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12
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Hu S, Lu Z, Liu M, Xu H, Wu J, Chen F. TfOH-Catalyzed Cascade C-H Activation/Lactonization of Phenols with α-Aryl-α-diazoesters: Rapid Access to α-Aryl Benzofuranones. J Org Chem 2020; 85:14916-14925. [PMID: 32957783 DOI: 10.1021/acs.joc.0c01583] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Aryl benzofuranones are privileged structural units present in natural products and pharmaceutically relevant compounds with high bioactivity and therapeutic value; synthetic access to these scaffolds remains an area of intensive interest. A new and efficient TfOH-catalyzed cascade ortho C-H activation/lactonization of phenols with α-aryl-α-diazoacetates is reported. This metal-free protocol provides an operationally simple and rapid method for the one-pot assembly of diverse α-aryl benzofuranones in high yields with broad substrate scope, a readily starting material, good chemo-regioselectivity, and excellent functional group compatibility.
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Affiliation(s)
- Sha Hu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Zuolin Lu
- Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou 310014, China
| | - Minjie Liu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Hanlin Xu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Jiale Wu
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| | - Fener Chen
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China.,Institute of Pharmaceutical Science and Technology, Zhejiang University of Technology, 18 Chao Wang Road, Hangzhou 310014, China
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13
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Saridakis I, Kaiser D, Maulide N. Unconventional Macrocyclizations in Natural Product Synthesis. ACS CENTRAL SCIENCE 2020; 6:1869-1889. [PMID: 33274267 PMCID: PMC7706100 DOI: 10.1021/acscentsci.0c00599] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Indexed: 06/12/2023]
Abstract
Over the past several decades, macrocyclic compounds have emerged as increasingly significant therapeutic candidates in drug discovery. Their pharmacological activity hinges on their rotationally restricted three-dimensional orientation, resulting in a unique conformational preorganization and a high enthalpic gain as a consequence of high-affinity macrocycle-protein binding interactions. Synthetic access to macrocyclic drug candidates is therefore crucial. From a synthetic point of view, the efficiency of macrocyclization events commonly suffers from entropic penalties as well as undesired intermolecular couplings (oligomerization). Although over the past several decades ring-closing metathesis, macrolactonization, or macrolactamization have become strategies of choice, the toolbox of organic synthesis provides a great number of versatile transformations beyond the aforementioned. This Outlook focuses on a selection of examples employing what we term unconventional macrocyclizations toward the synthesis of natural products or analogues.
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Affiliation(s)
- Iakovos Saridakis
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
| | - Daniel Kaiser
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
| | - Nuno Maulide
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
- Research
Platform for Next Generation Macrocycles, Währinger Strasse 38, 1090 Vienna, Austria
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14
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Preparative scale synthesis of functionalized bioxazole. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02667-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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15
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Manfrin A, Borduas-Dedekind N, Lau K, McNeill K. Singlet Oxygen Photooxidation of Peptidic Oxazoles and Thiazoles. J Org Chem 2019; 84:2439-2447. [PMID: 30681338 DOI: 10.1021/acs.joc.8b02684] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Oxazoles and thiazoles are commonly found moieties in nonribosomal peptides (NRPs) and ribosomally synthesized post-translationally modified peptides (RiPPs), which are important biomolecules present in the environment and in natural waters. From previous studies, they seem susceptible to oxidation by singlet oxygen (1O2); therefore, we designed and synthesized model oxazole- and thiazole-peptides and measured their 1O2 bimolecular reaction rate constants, showing slow photooxidation under environmental conditions. We reasoned their stability through the electron-withdrawing effect of the carboxamide substituent. Reaction products were elucidated and support a reaction mechanism involving cycloaddition followed by a series of rearrangements. The first 1O2 bimolecular reaction rate constant for a RiPP, the thiazole-containing peptide Aerucyclamide A, was measured and found in good agreement with the model peptide's rate constant, highlighting the potential of using model peptides to study the transformations of other environmentally relevant NRPs and RiPPs.
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Affiliation(s)
- Alessandro Manfrin
- Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science , ETH Zurich , 8092 Zurich , Switzerland
| | - Nadine Borduas-Dedekind
- Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science , ETH Zurich , 8092 Zurich , Switzerland
| | - Kate Lau
- Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science , ETH Zurich , 8092 Zurich , Switzerland
| | - Kristopher McNeill
- Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science , ETH Zurich , 8092 Zurich , Switzerland
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16
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Affiliation(s)
- Joshua B. Cox
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - Aoi Kimishima
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - John L. Wood
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
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17
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Ma JW, Wang Q, Wang XG, Liang YM. Palladium-Catalyzed Cascade Difluoroalkylation/Cyclization of N-Propargylamides: Synthesis of Oxazoles and Oxazolines. J Org Chem 2018; 83:13296-13307. [DOI: 10.1021/acs.joc.8b02111] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Jun-Wei Ma
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P.R. China
| | - Qiang Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P.R. China
| | - Xin-Gang Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P.R. China
| | - Yong-Min Liang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P.R. China
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18
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Bu L, Li J, Yin Y, Qiao B, Chai G, Zhao X, Jiang Z. Organocatalytic Asymmetric Cascade Aerobic Oxidation and Semipinacol Rearrangement Reaction: A Visible Light-Induced Approach to Access Chiral 2,2-Disubstituted Indolin-3-ones. Chem Asian J 2018; 13:2382-2387. [PMID: 29901864 DOI: 10.1002/asia.201800446] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/28/2018] [Indexed: 12/11/2022]
Abstract
An enantioselective cascade aerobic oxidation and semipinacol rearrangement reaction of 2-aryl-3-alkyl-substituted indoles via visible-light-driven cooperative organophotoredox and H-bonding catalysis is reported. The current method provides an expedient and sustainable approach to furnish a variety of valuable chiral 2-aryl-2-alkyl-substituted indolin-3-ones in 64-90 % yield with 58-94 % ee. Preliminary control experiments present important insights into the stereochemistry.
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Affiliation(s)
- Liwei Bu
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P. R. China
| | - Jiangtao Li
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P. R. China
| | - Yanli Yin
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P. R. China
- College of Bioengineering, Henan University of Technology, Zhengzhou, Henan, 450001, P. R. China
| | - Baokun Qiao
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P. R. China
| | - Guobi Chai
- Key Laboratory of Tobacco Flavor Basic Research of CNTC, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, Henan, 450001, P. R. China
| | - Xiaowei Zhao
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P. R. China
| | - Zhiyong Jiang
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan, 475004, P. R. China
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19
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Watters DJ. Ascidian Toxins with Potential for Drug Development. Mar Drugs 2018; 16:E162. [PMID: 29757250 PMCID: PMC5983293 DOI: 10.3390/md16050162] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2018] [Revised: 05/05/2018] [Accepted: 05/10/2018] [Indexed: 12/17/2022] Open
Abstract
Ascidians (tunicates) are invertebrate chordates, and prolific producers of a wide variety of biologically active secondary metabolites from cyclic peptides to aromatic alkaloids. Several of these compounds have properties which make them candidates for potential new drugs to treat diseases such as cancer. Many of these natural products are not produced by the ascidians themselves, rather by their associated symbionts. This review will focus mainly on the mechanism of action of important classes of cytotoxic molecules isolated from ascidians. These toxins affect DNA transcription, protein translation, drug efflux pumps, signaling pathways and the cytoskeleton. Two ascidian compounds have already found applications in the treatment of cancer and others are being investigated for their potential in cancer, neurodegenerative and other diseases.
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Affiliation(s)
- Dianne J Watters
- School of Environment and Science, Griffith University, Brisbane, Queensland 4111, Australia.
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20
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Slobodyanyuk EY, Artamonov OS, Kulik IB, Rusanov E, Volochnyuk DM, Grygorenko OO. A bio-inspired approach to proline-derived 2,4-disubstituted oxazoles. HETEROCYCL COMMUN 2018. [DOI: 10.1515/hc-2017-0235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
A convenient four-step approach to the synthesis of (S)-4-alkyl-2-(pyrrolidin-2-yl)oxazoles starting from l-Boc-proline inspired by naturally occurring oxazole-containing peptidomimetics is described. The key step is the cyclization of 1-Boc-N-(1-oxoalkan-2-yl)pyrrolidine-2-carboxamides – aldehyde intermediates which demonstrate low to moderate stability – under Appel reaction conditions. This method furnishes the target compounds with more than 98% ee and in a 17–51% overall yield and has been used at up to a 45-g scale.
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Affiliation(s)
- Evgeniy Y. Slobodyanyuk
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Oleksiy S. Artamonov
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Irene B. Kulik
- Institute of Bioorganic Chemistry and Petrochemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Eduard Rusanov
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Dmitriy M. Volochnyuk
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine , Kyiv 02660 , Ukraine
| | - Oleksandr O. Grygorenko
- National Taras Shevchenko University of Kyiv , Volodymyrska Street, 64 , Kyiv 01601 , Ukraine
- Enamine Ltd. , Chervonotkatska 78 , Kyiv 02094 , Ukraine
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21
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C. P. P, Joseph E, A A, D. S. N, Ibnusaud I, Raskatov J, Singaram B. Stabilization of NaBH4 in Methanol Using a Catalytic Amount of NaOMe. Reduction of Esters and Lactones at Room Temperature without Solvent-Induced Loss of Hydride. J Org Chem 2018; 83:1431-1440. [DOI: 10.1021/acs.joc.7b02993] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Prasanth C. P.
- Institute for Intensive Research in Basic Sciences, Mahatma Gandhi University, P.D. Hills P. O., Kottayam, Kerala 686560, India
| | - Ebbin Joseph
- Institute for Intensive Research in Basic Sciences, Mahatma Gandhi University, P.D. Hills P. O., Kottayam, Kerala 686560, India
| | - Abhijith A
- Institute for Intensive Research in Basic Sciences, Mahatma Gandhi University, P.D. Hills P. O., Kottayam, Kerala 686560, India
| | - Nair D. S.
- Institute for Intensive Research in Basic Sciences, Mahatma Gandhi University, P.D. Hills P. O., Kottayam, Kerala 686560, India
| | - Ibrahim Ibnusaud
- Institute for Intensive Research in Basic Sciences, Mahatma Gandhi University, P.D. Hills P. O., Kottayam, Kerala 686560, India
| | - Jevgenij Raskatov
- Department
of Chemistry and Biochemistry, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, United States
| | - Bakthan Singaram
- Department
of Chemistry and Biochemistry, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, United States
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22
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MORENO-CABRERIZO CRISTINA, ORTEGA-MARTÍNEZ AITOR, MOLINA CYNTHIA, NÁJERA CARMEN, SANSANO JOSÉM. Deacylative alkylation (DaA) of N-methyl-3-acetyl-2-oxindole for the synthesis of symmetrically 3,3-disubstituted 2-oxindoles. An access gate to anticancer agents and natural products. ACTA ACUST UNITED AC 2018; 90:1089-1099. [DOI: 10.1590/0001-3765201820170783] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 11/16/2017] [Indexed: 01/24/2023]
Affiliation(s)
| | | | - CYNTHIA MOLINA
- Universidad de Alicante, Spain; Universidad de Alicante, Spain
| | | | - JOSÉ M. SANSANO
- Universidad de Alicante, Spain; Universidad de Alicante, Spain
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23
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Reddy RJ, Ball‐Jones MP, Davies PW. Alkynyl Thioethers in Gold-Catalyzed Annulations To Form Oxazoles. Angew Chem Int Ed Engl 2017; 56:13310-13313. [PMID: 28841255 PMCID: PMC5656920 DOI: 10.1002/anie.201706850] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Indexed: 11/29/2022]
Abstract
Non-oxidative, regioselective, and convergent access to densely functionalized oxazoles is realized in a functional-group tolerant manner using alkynyl thioethers. Sulfur-terminated alkynes provide access to reactivity previously requiring strong donor-substituted alkynes such as ynamides. Sulfur does not act in an analogous donor fashion in this gold-catalyzed reaction, thus leading to complementary regioselective outcomes and addressing the limitations of using ynamides.
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24
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Reddy RJ, Ball-Jones MP, Davies PW. Alkynyl Thioethers in Gold-Catalyzed Annulations To Form Oxazoles. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201706850] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | | | - Paul W. Davies
- School of Chemistry; University of Birmingham; Birmingham UK
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25
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Allred TK, Manoni F, Harran PG. Exploring the Boundaries of “Practical”: De Novo Syntheses of Complex Natural Product-Based Drug Candidates. Chem Rev 2017; 117:11994-12051. [DOI: 10.1021/acs.chemrev.7b00126] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tyler K. Allred
- Department of Chemistry and
Biochemistry, University of California−Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Francesco Manoni
- Department of Chemistry and
Biochemistry, University of California−Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Patrick G. Harran
- Department of Chemistry and
Biochemistry, University of California−Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
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26
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Schendera E, Lerch S, von Drathen T, Unkel LN, Brasholz M. Phosphoric Acid Catalyzed 1,2-Rearrangements of 3-Hydroxyindolenines to Indoxyls and 2-Oxindoles: Reagent-Controlled Regioselectivity Enabled by Dual Activation. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700085] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Eva Schendera
- University of Hamburg; Department of Chemistry; Institute of Organic Chemistry; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Stephanie Lerch
- University of Hamburg; Department of Chemistry; Institute of Organic Chemistry; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Thorsten von Drathen
- University of Hamburg; Department of Chemistry; Institute of Organic Chemistry; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Lisa-Natascha Unkel
- University of Hamburg; Department of Chemistry; Institute of Organic Chemistry; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Malte Brasholz
- University of Hamburg; Department of Chemistry; Institute of Organic Chemistry; Martin-Luther-King-Platz 6 20146 Hamburg Germany
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