1
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Xie Y, Zhang Z, Zhang B, He N, Peng M, Song S, Wang B, Yu F. Oxidative Free-Radical C(sp 2)-H Bond Chlorination of Enaminones with LiCl: Access to Highly Functionalized α-Chlorinated Enaminones. J Org Chem 2024; 89:8521-8530. [PMID: 38828704 DOI: 10.1021/acs.joc.4c00456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
An oxidative free-radical C(sp2)-H bond chlorination strategy of enaminones has been developed by using LiCl as a chlorinating reagent and K2S2O8 as an oxidant. This transformation provides a new and straightforward synthetic methodology to afford highly functionalized α-chlorinated enaminones with a Z-configuration in good to excellent yields.
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Affiliation(s)
- Yunhua Xie
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Zhilai Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Biao Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Nengqin He
- Yunnan Key Laboratory for Pollution Processes and Control of Plateau Lake-Watersheds, Yunnan Academy of Ecological and Environmental Sciences, Kunming 650500, P. R. China
| | - Menglin Peng
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Siyu Song
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Baoqu Wang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Fuchao Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
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2
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Yang W, Tian ZY, Lin YJ, Xie LY. An Unexpected Synthesis of 2-Sulfonylquinolines via Deoxygenative C2-Sulfonylation of Quinoline N-Oxides with Sulfonyl Chlorides. Molecules 2024; 29:2863. [PMID: 38930928 PMCID: PMC11206716 DOI: 10.3390/molecules29122863] [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: 05/28/2024] [Revised: 06/09/2024] [Accepted: 06/14/2024] [Indexed: 06/28/2024] Open
Abstract
A mild, efficient and practical protocol for the preparation of 2-sulfonylquinolines through CS2/Et2NH-induced deoxygenative C2-H sulfonylation of quinoline N-oxides with readily available RSO2Cl was developed. The reaction proceeded well under transition-metal-free conditions and exhibited a wide substrate scope and functional group tolerance. The preliminary studies suggested that the nucleophilic sulfonyl sources were generated in situ via the reaction of CS2, Et2NH and sulfonyl chlorides.
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Affiliation(s)
| | | | | | - Long-Yong Xie
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China
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3
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Xie LY, Liu C, Wang SY, Tian ZY, Peng S. Ts 2O mediated deoxygenative C2-dithiocarbamation of quinoline N-oxides with CS 2 and amines. RSC Adv 2024; 14:14465-14469. [PMID: 38699687 PMCID: PMC11063682 DOI: 10.1039/d4ra02003k] [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: 03/15/2024] [Accepted: 04/27/2024] [Indexed: 05/05/2024] Open
Abstract
A general, efficient and practical protocol for Ts2O promoted deoxygenative dithiocarbamation of quinoline N-oxides with in situ generated dithiocarbamic acids from CS2 and amines is reported. The reaction proceeded well under transition-metal free conditions to obtain a variety of novel quinoline-dithiocarbamate compounds with wide functional group tolerance and good to high yields.
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Affiliation(s)
- Long-Yong Xie
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering Yongzhou 425100 China
| | - Chu Liu
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering Yongzhou 425100 China
| | - Si-Yu Wang
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering Yongzhou 425100 China
| | - Zhong-Ying Tian
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering Yongzhou 425100 China
| | - Sha Peng
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering Yongzhou 425100 China
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4
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Zhao MY, Tang JJ, Lin YJ, Tian ZY, Peng S, Xie LY. Ts 2O Promoted Deoxygenative C-H Dithiocarbonation of Quinoline N-Oxides with Potassium O-Alkyl Xanthates. J Org Chem 2024; 89:5560-5572. [PMID: 38564232 DOI: 10.1021/acs.joc.4c00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
A simple, efficient, and practical method for the synthesis of S-quinolyl xanthates was developed via Ts2O-promoted deoxygenative C-H dithiocarbonation of quinoline N-oxides with various potassium O-alkyl xanthates. The reaction performed well under transition-metal-free, base-free, and room-temperature conditions with wide substrate tolerance. Employing potassium O-tert-butyl xanthate (tBuOCS2K) as a nucleophile, some valuable quinoline-2-thiones were unexpectedly obtained in a one-pot reaction without any additional base.
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Affiliation(s)
- Meng-Yang Zhao
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, Hunan, China
| | - Jia-Jun Tang
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, Hunan, China
| | - Ying-Jun Lin
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, Hunan, China
| | - Zhong-Ying Tian
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, Hunan, China
| | - Sha Peng
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, Hunan, China
| | - Long-Yong Xie
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, Hunan, China
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5
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Wang K, Gong C, Xiao W, Abdukader A, Wang D. Accessing 1,8-Naphthyridone-3-carboxylic Acid Derivatives and Application to the Synthesis of Amfonelic Acid. J Org Chem 2024; 89:5811-5824. [PMID: 38602006 DOI: 10.1021/acs.joc.4c00415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
1,8-Naphthyridone-3-carboxyl is the core structure of several on-market antibacterial drugs. It has prompted significant interest from the synthetic community. Here, we report a practical synthesis of diversely functionalized 1,8-naphthyridone-3-carboxylic acid derivatives starting from readily available and inexpensive nicotinic acid derivatives. All key steps have been optimized. Furthermore, the usefulness of this protocol has been exemplified by the first synthesis of amfonelic acid.
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Affiliation(s)
- Kaijuan Wang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang,China
| | - Chengcheng Gong
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang,China
| | - Weiwei Xiao
- School of Pharmaceutical Sciences and Institute of Materia Medica, Xinjiang University, Urumqi830017, Xinjiang,China
| | - Ablimit Abdukader
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang,China
| | - Dong Wang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang,China
- School of Pharmaceutical Sciences and Institute of Materia Medica, Xinjiang University, Urumqi830017, Xinjiang,China
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6
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Bone KI, Puleo TR, Bandar JS. Direct C-H Hydroxylation of N-Heteroarenes and Benzenes via Base-Catalyzed Halogen Transfer. J Am Chem Soc 2024; 146:9755-9767. [PMID: 38530788 PMCID: PMC11006572 DOI: 10.1021/jacs.3c14058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2024]
Abstract
Hydroxylated (hetero)arenes are valued in many industries as both key constituents of end products and diversifiable synthetic building blocks. Accordingly, the development of reactions that complement and address the limitations of existing methods for the introduction of aromatic hydroxyl groups is an important goal. To this end, we apply base-catalyzed halogen transfer (X-transfer) to enable the direct C-H hydroxylation of mildly acidic N-heteroarenes and benzenes. This protocol employs an alkoxide base to catalyze X-transfer from sacrificial 2-halothiophene oxidants to aryl substrates, forming SNAr-active intermediates that undergo nucleophilic hydroxylation. Key to this process is the use of 2-phenylethanol as an inexpensive hydroxide surrogate that, after aromatic substitution and rapid elimination, provides the hydroxylated arene and styrene byproduct. Use of simple 2-halothiophenes allows for C-H hydroxylation of 6-membered N-heteroarenes and 1,3-azole derivatives, while a rationally designed 2-halobenzothiophene oxidant extends the scope to electron-deficient benzene substrates. Mechanistic studies indicate that aromatic X-transfer is reversible, suggesting that the deprotonation, halogenation, and substitution steps operate in synergy, manifesting in unique selectivity trends that are not necessarily dependent on the most acidic aryl position. The utility of this method is further demonstrated through streamlined target molecule syntheses, examples of regioselectivity that contrast alternative C-H hydroxylation methods, and the scalable recycling of the thiophene oxidants.
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Affiliation(s)
- Kendelyn I. Bone
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Thomas R. Puleo
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Jeffrey S. Bandar
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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7
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Wu LY, Tian Huang, Tian ZY, Xu XQ, Peng S, Xie LY. TsCl promoted deoxygenative phosphorothiolation of quinoline N-oxides towards S-quinolyl phosphorothioates. Org Biomol Chem 2024; 22:2409-2413. [PMID: 38411219 DOI: 10.1039/d4ob00111g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
A convenient, efficient and practical approach for the synthesis of S-quinolyl phosphorothioates via cheap TsCl promoted deoxygenative C2-H phosphorothiolation of quinoline N-oxides with readily available triethylammonium O,O-dialkylphosphorothioates was developed. The reaction performed well under transition-metal-free conditions at room temperature with a very short reaction time (10-20 min). Preliminary studies showed that the current transformation underwent a nucleophilic substitution process.
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Affiliation(s)
- Li-Yao Wu
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Hunan, 425100, China.
| | - Tian Huang
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Hunan, 425100, China.
| | - Zhong-Ying Tian
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Hunan, 425100, China.
| | - Xiang-Qin Xu
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Hunan, 425100, China.
| | - Sha Peng
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Hunan, 425100, China.
| | - Long-Yong Xie
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Hunan, 425100, China.
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8
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Ma Q, Shi Y, Wang D. Phosphonium Salt-Promoted C2-H Functionalization of Heterocyclic N-Oxides. Org Lett 2023; 25:9181-9185. [PMID: 38117207 DOI: 10.1021/acs.orglett.3c03742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
We report the development of a phosphonium salt as a remarkable activating agent that enables the direct conversion of C2-H bonds of a variety of heterocyclic N-oxides into C2-N, C2-O, or C2-S bonds with high efficiency. The phosphonium salt was prepared on a >150 g scale in a single step and is tolerant of multiple functionalities.
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Affiliation(s)
- Qian Ma
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, China
| | - Yuze Shi
- Institute of Materia Medica, Xinjiang University, Urumqi 830017, Xinjiang, China
| | - Dong Wang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, China
- Institute of Materia Medica, Xinjiang University, Urumqi 830017, Xinjiang, China
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9
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Xu LC, Ma XD, Liu KM, Duan XF. Chemo- and Regioselective Alkylation of Pyridine N-Oxides with Titanacyclopropanes. Org Lett 2023. [PMID: 38016093 DOI: 10.1021/acs.orglett.3c03469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
While titanacyclopropanes are used to react mainly with ester, amide, and cyano to undergo cyclopropanation, herein they react preferentially with pyridine N-oxide to accomplish C2-H alkylation beyond these functionalities with double regioselectivity. After being pyridylated at the less hindered C-Ti bond, the remaining C-Ti bond of titanacyclopropanes can be further functionalized by various electrophiles, allowing facile introduction of complex alkyls onto the C2 of pyridines. Its synthetic potential has been demonstrated by late-stage diversification of drugs.
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Affiliation(s)
- Li-Chen Xu
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
| | - Xiao-Di Ma
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
| | - Kun-Ming Liu
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
| | - Xin-Fang Duan
- College of Chemistry, Beijing Normal University, Beijing 100875, P.R. China
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10
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Festa AA, Storozhenko OA, Voskressensky LG, Van der Eycken EV. Visible light-mediated halogenation of organic compounds. Chem Soc Rev 2023. [PMID: 37975853 DOI: 10.1039/d3cs00366c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
The use of visible light and photoredox catalysis emerged as a powerful and sustainable tool for organic synthesis, showing high value for distinctly different ways of bond creation. Halogenated compounds are the cornerstone of contemporary organic synthesis: it is almost impossible to develop a route towards a pharmaceutical reagent, agrochemical, natural product, etc. without the involvement of halogen-containing intermediates. Moreover, the halogenated derivatives as final products became indispensable for drug discovery and materials science. The idea of this review is to understand and summarise the impact of visible light-promoted chemistry on halogenation and halofunctionalisation reactions.
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Affiliation(s)
- Alexey A Festa
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
| | - Olga A Storozhenko
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
| | - Leonid G Voskressensky
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
| | - Erik V Van der Eycken
- Peoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya st. 6, Moscow, 117198, Russian Federation.
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001, Leuven, Belgium
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11
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Nasuhipur F, Ghasemi Z, Poupon M, Dušek M. POCl 3 mediated one-pot deoxygenative aromatization and electrophilic chlorination of dihydroxy-2-methyl-4-oxo-indeno[1,2- b]pyrroles. RSC Adv 2023; 13:17812-17816. [PMID: 37323449 PMCID: PMC10261912 DOI: 10.1039/d3ra02515b] [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: 04/15/2023] [Accepted: 06/07/2023] [Indexed: 06/17/2023] Open
Abstract
A class of indenopyrroles is presented by the treatment of known dihydroxy-2-methyl-4-oxoindeno[1,2-b]pyrroles with phosphorus oxychloride (POCl3). The elimination of vicinal hydroxyl groups at the 3a and 8b positions, formation of a π bond, and electrophilic chlorination of the methyl group attached to C2 resulted in the fused aromatic pyrrole structures. Benzylic substitution of various nucleophiles such as H2O, EtOH, and NaN3 with a chlorine atom gave diverse 4-oxoindeno[1,2-b]pyrrole derivatives in 58 to 93% yields. The reaction was investigated in different aprotic solvents, and the highest reaction yield was obtained in DMF. The structures of the products were confirmed by spectroscopic methods, elemental analysis, and X-ray crystallography.
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Affiliation(s)
- Forough Nasuhipur
- Department of Organic Chemistry and Biochemistry, Faculty of Chemistry, University of Tabriz Tabriz 5166614766 Iran
| | - Zarrin Ghasemi
- Department of Organic Chemistry and Biochemistry, Faculty of Chemistry, University of Tabriz Tabriz 5166614766 Iran
| | - Morgane Poupon
- Institute of Physics ASCR, v.v.i. Na Slovance 2, 182 21 Praha 8 Czech Republic
| | - Michal Dušek
- Institute of Physics ASCR, v.v.i. Na Slovance 2, 182 21 Praha 8 Czech Republic
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12
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Singh J, Patel RI, Sharma A. Visible‐Light‐Mediated C‐2 Functionalization and Deoxygenative Strategies in Heterocyclic
N
‐Oxides. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jitender Singh
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee 247667 India
| | - Roshan I. Patel
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee 247667 India
| | - Anuj Sharma
- Department of Chemistry Indian Institute of Technology Roorkee Roorkee 247667 India
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13
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Liu X, Wu Z, Feng C, Liu W, Li M, Shen Z. Catalyst‐ and Oxidant‐free Electrochemical Halogenation Reactions of 2H‐Indazoles with NaX (X = Cl, Br). European J Org Chem 2022. [DOI: 10.1002/ejoc.202200262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xin Liu
- Zhejiang University of Technology College of Chemical Engeering CHINA
| | - Zengzhi Wu
- Zhejiang University of Technology College of Chemical Engeering CHINA
| | - Chenglong Feng
- Zhejiang University of Technology College of Chemical Engeering CHINA
| | - Wenlu Liu
- Zhejiang University of Technology College of Chemical Engeering CHINA
| | - Meichao Li
- Zhejiang University of Technology College of Chemical Engeering CHINA
| | - Zhenlu Shen
- Zhejiang University of Technology College of Chemical Engineering 18 Chaowang Road 310032 Hangzhou CHINA
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14
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Lipshultz JM, Radosevich AT. Uniting Amide Synthesis and Activation by P III/P V-Catalyzed Serial Condensation: Three-Component Assembly of 2-Amidopyridines. J Am Chem Soc 2021; 143:14487-14494. [PMID: 34478308 DOI: 10.1021/jacs.1c07608] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An organophosphorus (PIII/PV redox) catalyzed method for the three-component condensation of amines, carboxylic acids, and pyridine N-oxides to generate 2-amidopyridines via serial dehydration is reported. Whereas amide synthesis and functionalization usually occur under divergent reaction conditions, here a phosphetane catalyst (together with a mild bromenium oxidant and terminal hydrosilane reductant) is shown to drive both steps chemoselectively in an auto-tandem catalytic cascade. The ability to both prepare and functionalize amides under the action of a single organocatalytic reactive intermediate enables new possibilities for the efficient and modular preparation of medicinal targets.
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Affiliation(s)
- Jeffrey M Lipshultz
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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