1
|
Wang YQ, Chen LJ, Yang RL, Lang M, Peng JB. Oxidative [4+2] Annulation of Pyrrole-2-carbaldehyde Derivatives with o-Hydroxyphenyl Propargylamines: Syntheses of 5,6,7-Trisubstituted Indolizines. Chemistry 2024:e202402487. [PMID: 39177474 DOI: 10.1002/chem.202402487] [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: 07/01/2024] [Revised: 08/16/2024] [Accepted: 08/20/2024] [Indexed: 08/24/2024]
Abstract
A base promoted oxidative [4+2] annulation of pyrrole-2-carbaldehyde derivatives with o-hydroxyphenyl propargylamines for the synthesis of highly substituted indolizines has been developed. Using DBN as base, a broad range of 5,6,7-trisubstituted indolizines have been prepared in good to excellent yields under mild conditions, and many useful functional groups can be tolerated.
Collapse
Affiliation(s)
- Yu-Qing Wang
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong, 529020, People's Republic of China
| | - Li-Jia Chen
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong, 529020, People's Republic of China
| | - Rui-Lin Yang
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong, 529020, People's Republic of China
| | - Ming Lang
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong, 529020, People's Republic of China
| | - Jin-Bao Peng
- School of Pharmacy and Food Engineering, Wuyi University, Jiangmen, Guangdong, 529020, People's Republic of China
| |
Collapse
|
2
|
Truchon A, Gorodnichy M, Olivero S, Michelet V. Gold(I)-Catalyzed Functionalization of Pyrrole Derivatives: Stereoselective Synthesis of 7,8-Disubstituted 7,8-Dihydroindolizin-6(5 H)-ones. Org Lett 2024; 26:6698-6702. [PMID: 39078108 DOI: 10.1021/acs.orglett.4c02334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2024]
Abstract
A gold-catalyzed cycloisomerization/nucleophilic addition/C-O rearrangement was developed starting from readily available pyrrole precursors. This efficient synthesis of 7,8-dihydroindolizin-6(5H)-ones (with the creation of new C-C and C-O bonds) allows access to key intermediates for the synthesis of natural and biologically active molecules. The functionalization process was independently optimized for both carbon and oxygen nucleophiles, and the versatility of this methodology was established by the synthesis of 36 different pyrrole derivatives (yields up to 90%).
Collapse
Affiliation(s)
- Alexis Truchon
- Université Côte d'Azur, Institut de Chimie de Nice, Valrose Park, 06108 Nice Cedex 2, France
| | - Mila Gorodnichy
- Université Côte d'Azur, Institut de Chimie de Nice, Valrose Park, 06108 Nice Cedex 2, France
| | - Sandra Olivero
- Université Côte d'Azur, Institut de Chimie de Nice, Valrose Park, 06108 Nice Cedex 2, France
| | - Véronique Michelet
- Université Côte d'Azur, Institut de Chimie de Nice, Valrose Park, 06108 Nice Cedex 2, France
| |
Collapse
|
3
|
Guo W, Huang J, Ishihara K. Chiral π-Cu(ii)-catalyzed site-, exo/ endo-, and enantioselective dearomative (3 + 2) cycloadditions of isoquinolinium ylides with enamides, dienamides, and a trienamide. Chem Sci 2024; 15:10926-10934. [PMID: 39027307 PMCID: PMC11253176 DOI: 10.1039/d4sc02946a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Accepted: 06/05/2024] [Indexed: 07/20/2024] Open
Abstract
Here, we report a highly effective dearomative (3 + 2) cycloaddition reaction between isoquinolinium ylides and α,β-enamides, α,β-γ,δ-dienamides, or an α,β-γ,δ-ε,ζ-trienamide, which is catalyzed by a chiral π-Cu(ii) complex (1-10 mol%) and proceeds in a site-selective, exo/endo-selective, and enantioselective manner. The (3 + 2) cycloaddition involving the α,β-enamides proceeds with high exo-selectivity and enantioselectivity. This method is applicable to various substrates including α-substituted, α,β-disubstituted, or β,β-disubstituted α,β-enamides, which are compounds with an intrinsically low reactivity. This method provides synthetic access to pyrroloisoquinoline derivatives with up to three chiral carbon centers, including those featuring fluorine and trifluoromethyl groups, as well as quaternary carbon centers. The (3 + 2) cycloaddition involving α,β-γ,δ-dienamides proceeds with high γ,δ-site-selectivity and enantioselectivity, whereby the exo/endo-selectivity depends on the substrates and ligands. Remarkably, the (3 + 2) cycloaddition of δ-phenyl-α,β-γ,δ-dienamide proceeds with high α,β-site-selectivity, exo-selectivity, and enantioselectivity. In a manner similar to the reaction with the α,β-γ,δ-dienamides, α,β-γ,δ-ε,ζ-trienamide furnishes a (3 + 2) cycloadduct with good ε,ζ-site-selectivity, endo-selectivity, and enantioselectivity.
Collapse
Affiliation(s)
- Weiwei Guo
- Graduate School of Engineering, Nagoya University B2-3(611), Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Jianhao Huang
- Graduate School of Engineering, Nagoya University B2-3(611), Furo-cho, Chikusa Nagoya 464-8603 Japan
| | - Kazuaki Ishihara
- Graduate School of Engineering, Nagoya University B2-3(611), Furo-cho, Chikusa Nagoya 464-8603 Japan
| |
Collapse
|
4
|
Anosike IS, Beng TK. Harnessing the 1,3-azadiene-anhydride reaction for the regioselective and stereocontrolled synthesis of lactam-fused bromotetrahydropyrans by bromoetherification of lactam-tethered trisubstituted tertiary alkenols. RSC Adv 2024; 14:18501-18507. [PMID: 38860240 PMCID: PMC11163878 DOI: 10.1039/d4ra02523g] [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: 04/03/2024] [Accepted: 06/05/2024] [Indexed: 06/12/2024] Open
Abstract
Halo-cycloetherification of lactam-tethered alkenols enables the construction of oxygen-heterocycles that are fused to nitrogen heterocycles via intramolecular halonium-induced nucleophilic addition. Specifically, tetrahydropyrans (THPs) that are fused to a nitrogen heterocycle constitute the core of several bioactive molecules, including tachykinin receptor antagonists and alpha-1 adrenergic antagonists. Although the literature is replete with successful examples of the halo-cycloetherification of simple mono- or disubstituted primary alkenols, methods for the modular, efficient, regioselective, and stereocontrolled intramolecular haloetherification of sterically encumbered trisubstituted tertiary alkenols are rare. Here, we describe a simple intramolecular bromoetherification strategy that meets these benchmarks and proceeds with exclusive 6-endo regioselectivity. The transformation employs mild and water-tolerant conditions, which bodes well for late-stage diversification. The hindered ethers contain four contiguous stereocenters as well as one halogen-bearing tetrasubstituted stereocenter.
Collapse
Affiliation(s)
- Ifeyinwa S Anosike
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| | - Timothy K Beng
- Department of Chemistry, Central Washington University Ellensburg WA 98926 USA
| |
Collapse
|
5
|
Li MJ, Lu MM, Xu P, Chen SQ, Wu LT, Zhang Z, Xu H. Chemodivergent mechanosynthesis of cyclopentenyl and pyrrolinyl spirobarbiturates from unsaturated barbiturates and enamino esters. Chem Commun (Camb) 2024; 60:3958-3961. [PMID: 38501223 DOI: 10.1039/d3cc06327e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
A novel and interesting controllable spirocyclization of unsaturated barbiturates with enamino esters for the assembly of cyclopentenyl and pyrrolinyl spirobarbiturates has been developed under ball-milling conditions. The present protocol features high chemoselectivity and efficiency, excellent functional group tolerance and mild reaction conditions.
Collapse
Affiliation(s)
- Ming-Jun Li
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| | - Ming-Ming Lu
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| | - Peng Xu
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| | - Si-Qi Chen
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| | - Luan-Ting Wu
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| | - Ze Zhang
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| | - Hui Xu
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, P. R. China.
| |
Collapse
|
6
|
Guo W, Hori M, Ogura Y, Nishimura K, Oki K, Ikai T, Yashima E, Ishihara K. Tandem Isomerization/α,β-Site-Selective and Enantioselective Addition Reactions of N-(3-Butynoyl)-3,5-dimethylpyrazole Induced by Chiral π-Cu(II) Catalysts. J Am Chem Soc 2023; 145:27080-27088. [PMID: 38032102 PMCID: PMC10722507 DOI: 10.1021/jacs.3c10820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/07/2023] [Accepted: 11/08/2023] [Indexed: 12/01/2023]
Abstract
Allenes are important building blocks, and derivatization of products via cycloadditions of allenes could become a powerful strategy for constructing carbocyclic and heterocyclic rings. However, the development of catalytic site-selective and enantioselective cycloaddition reactions of allenes still presents significant challenges. Here, we report chiral π-Cu(II)-complex-catalyzed isomerization of N-(3-butynoyl)-3,5-dimethyl-1H-pyrazole to generate N-allenoylpyrazole in situ and subsequent α,β-site-selective and enantioselective [3 + 2], [4 + 2], or [2 + 2] cycloaddition or conjugate addition reactions. The asymmetric environment created by the intramolecular π-Cu(II) interactions provides the corresponding adducts in moderate to high yield with excellent enantioselectivity. To the best of our knowledge, this is the first successful method for chiral-Lewis-acid-catalyzed tandem isomerization/α,β-site-selective and enantioselective cycloaddition or conjugate addition reactions of latent non-γ-substituted allenoyl derivative.
Collapse
Affiliation(s)
- Weiwei Guo
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Masahiro Hori
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Yoshihiro Ogura
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kazuki Nishimura
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kosuke Oki
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Tomoyuki Ikai
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Eiji Yashima
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Kazuaki Ishihara
- Graduate
School of Engineering, Nagoya University, B2-3(611) Furo-cho, Chikusa, Nagoya 464-8603, Japan
| |
Collapse
|
7
|
Wang ZH, Zhang T, Shen LW, Yang X, Zhang YP, You Y, Zhao JQ, Yuan WC. Diverse Synthesis of Fused Polyheterocyclic Compounds via [3 + 2] Cycloaddition of In Situ-Generated Heteroaromatic N-Ylides and Electron-Deficient Olefins. Molecules 2023; 28:molecules28114410. [PMID: 37298885 DOI: 10.3390/molecules28114410] [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: 05/16/2023] [Revised: 05/25/2023] [Accepted: 05/26/2023] [Indexed: 06/12/2023] Open
Abstract
[3 + 2] Cycloaddition reactions of heteroaromatic N-ylides with electron-deficient olefins have been developed. The heteroaromatic N-ylides, in situ generated from N-phenacylbenzothiazolium bromides, can smoothly react with maleimides under very mild conditions, affording fused polycyclic octahydropyrrolo[3,4-c]pyrroles in good-to-excellent isolated yields. This reaction concept could also be extended to 3-trifluoroethylidene oxindoles and benzylidenemalononitriles as electron-deficient olefins for accessing highly functionalized polyheterocyclic compounds. A gram-scale experiment was also carried out to verify the practicability of the methodology.
Collapse
Affiliation(s)
- Zhen-Hua Wang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Tong Zhang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Li-Wen Shen
- College of Chemistry and Chemical Engineering, Zunyi Normal University, Zunyi 563006, China
| | - Xiu Yang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yan-Ping Zhang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yong You
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Jian-Qiang Zhao
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Wei-Cheng Yuan
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| |
Collapse
|
8
|
Liu X, Shi X, Zhou J, Huang C, Lin Y, Zhang C, Cao H. Dearomative cyclization of pyridines/isoquinolines with cyclopropenones: access to indolizinones and benzo-fused indolizinones. Chem Commun (Camb) 2023; 59:4051-4054. [PMID: 36929395 DOI: 10.1039/d3cc00492a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/15/2023]
Abstract
Dearomatization reactions provide a rapid approach to construct complicated molecules that are difficult to synthesize by traditional methods from simple aromatic compounds. Herein, we report an efficient dearomative [3+2] cycloaddition reaction of 2-alkynyl pyridines with diarylcyclopropenones, leading to the synthesis of densely functionalized indolizinones in moderate to good yields under metal-free conditions. In addition, this strategy can also be employed in dearomative cyclization of isoquinolines to access a variety of benzo-fused indolizinones. Density functional theory (DFT) calculations revealed that an appropriate substituent at the 2-position of pyridine is crucial to the dearomatization process.
Collapse
Affiliation(s)
- Xiang Liu
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China.
| | - Xiaotian Shi
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China.
| | - Jinlei Zhou
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China.
| | - Changfeng Huang
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China.
| | - Yu Lin
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China.
| | - Chen Zhang
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China. .,School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, 510006, China
| | - Hua Cao
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center, Guangdong Pharmaceutical University, Zhongshan 528458, China.
| |
Collapse
|
9
|
Wu WQ, Qin HL. Synthesis of Pyrazolo[1,5- a]pyridinyl, Pyrazolo[1,5- a]quinolinyl, and Pyrazolo[5,1- a]isoquinolinyl Sulfonyl Fluorides via a [3 + 2] Annulation. J Org Chem 2023. [PMID: 36797220 DOI: 10.1021/acs.joc.2c02242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
A [3 + 2] cycloaddition reaction of N-aminopyridines, N-aminoquinolines, and N-aminoisoquinolines with 1-bromoethene-1-sulfonyl fluoride (BESF) was performed to obtain optimum yields of various useful pyrazolo[1,5-a]pyridinyl, pyrazolo[1,5-a]quinolinyl, and pyrazolo[5,1-a]isoquinolinyl sulfonyl fluorides (43-90% yield). The transformation process showed broad substrate specificity, mild reaction conditions, and operational simplicity. Therefore, the reaction has great applicable value in the field of medicinal chemistry and other disciplines.
Collapse
Affiliation(s)
- Wen-Qian Wu
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 205 Luoshi Road, Wuhan, 430070, P. R. China
| | - Hua-Li Qin
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 205 Luoshi Road, Wuhan, 430070, P. R. China
| |
Collapse
|
10
|
Shaikh MA, Samal PP, Ubale AS, Krishnamurty S, Gnanaprakasam B. Lewis Acid-Catalyzed Chemodivergent and Regiospecific Reaction of Phenols with Quaternary Peroxyoxindoles. J Org Chem 2022; 87:14155-14167. [PMID: 36269888 DOI: 10.1021/acs.joc.2c01701] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The indium-catalyzed regiospecific coupling of substituted phenol derivatives and quaternary peroxyoxindoles for the synthesis of C2 or C4 benzoxazin-3-one-substituted phenols via skeletal rearrangement is described. This reaction is demonstrated with 17 examples with good yields and diverse aryl substituents. In contrast to the indium-catalyzed reaction, the Cu(OTf)2-catalyzed reaction of the phenol with quaternary peroxyoxindoles afforded C2 or C4 2-oxindole-substituted phenol derivatives. This diverse catalytic reaction generated various biologically important phenol-substituted 2-oxindole derivatives directly without any skeleton rearrangement and was demonstrated with 19 examples in high yield. The regiospecificity and the reaction pathways were explained with the support of density functional theory (DFT).
Collapse
Affiliation(s)
- Moseen A Shaikh
- Department of Chemistry, Indian Institute of Science Education and Research, Pune, Maharashtra 411008, India
| | - Pragnya Paramita Samal
- CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
| | - Akash S Ubale
- Department of Chemistry, Indian Institute of Science Education and Research, Pune, Maharashtra 411008, India
| | - Sailaja Krishnamurty
- CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
| | - Boopathy Gnanaprakasam
- Department of Chemistry, Indian Institute of Science Education and Research, Pune, Maharashtra 411008, India
| |
Collapse
|
11
|
Wang KK, Li YL, Jing J, Chen R, Zhao NN, Li ZH, Wang MY, Ji SK. Synthesis of 1,3,5-trisubstituted pyrazoles via 1,3-dipolar cycloaddition of nitrile imines with ninhydrin-derived Morita-Baylis-Hillman carbonates. Org Biomol Chem 2022; 20:6923-6930. [PMID: 35979893 DOI: 10.1039/d2ob01253g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An effective synthetic method for 1,3,5-trisubstituted pyrazoles via 1,3-dipolar cycloaddition reaction has been developed. This reaction could smoothly proceed between ninhydrin-derived Morita-Baylis-Hillman carbonates and nitrilimines to provide a wide scope of differently substituted pyrazoles in high yields (up to 95%). In addition, the reaction mechanism was also proposed to explain its regioselectivity.
Collapse
Affiliation(s)
- Kai-Kai Wang
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| | - Yan-Li Li
- Medical College, Xinxiang University, Xinxiang 453000, P.R. of China
| | - Jun Jing
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| | - Rongxiang Chen
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| | - Na-Na Zhao
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| | - Zhi-Hui Li
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| | - Ming-Yue Wang
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| | - Shuo-Ke Ji
- School of Pharmacy, Xinxiang University, Xinxiang 453000, P.R. of China.
| |
Collapse
|
12
|
Han H, Wang L, Niu X, Li C, Xu Y, Wang Q. Diastereoselective construction of bridged piperidines through an interrupted dearomative reduction. Chem Commun (Camb) 2022; 58:7964-7967. [PMID: 35758071 DOI: 10.1039/d2cc02225g] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An interrupted dearomative reduction strategy was developed to transform planar chalcone-based pyridinium salts into structurally intriguing bridged piperidines in a completely regio- and diastereoselective manner. This reaction proceeded successfully by using cheap and easily accessible NaBH4 as the reductant under mild conditions without exclusion of oxygen or use of special equipment.
Collapse
Affiliation(s)
- Huabin Han
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| | - Lele Wang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| | - Xinyue Niu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| | - Chaoyang Li
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| | - Yuanqing Xu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| | - Qilin Wang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| |
Collapse
|
13
|
Guo DG, Wang HJ, Zhou Y, Liu XL. Advances in chromone-based reactants in the ring opening and skeletal reconstruction reaction: access to skeletally diverse salicyloylbenzene/heterocycle derivatives. Org Biomol Chem 2022; 20:4681-4698. [PMID: 35617020 DOI: 10.1039/d2ob00478j] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Salicyloylbenzene/heterocycles are privileged scaffolds found in many natural products and bioactive molecules. Numerous useful approaches for the preparation of these privileged scaffolds have been developed in recent years. Among these approaches, chromone-based reactants have demonstrated their importance in the synthesis of these salicyloylbenzene/heterocycle scaffolds with structural complexity and potential biological appeal. In this review, the recent advances in the synthesis of salicyloylbenzene/heterocycles are summarized and discussed according to the chromone-based reactants which could be achieved in one step via ring-opening and skeletal reconstruction reactions. Both the mechanisms and the applications of the corresponding products in organic and medicinal chemistry are also described.
Collapse
Affiliation(s)
- Dong-Gui Guo
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food, Guizhou University, Guiyang, Guizhou 550025, P. R. China. .,College of Food and Pharmaceutical Engineering, Guizhou Institute of Technology, Guiyang 550003, China
| | - Hui-Juan Wang
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food, Guizhou University, Guiyang, Guizhou 550025, P. R. China.
| | - Ying Zhou
- College of Pharmaceutical Sciences, Guizhou University of Chinese Medicine, Guiyang, Guizhou 550025, P. R. China
| | - Xiong-Li Liu
- National & Local Joint Engineering Research Center for the Exploitation of Homology Resources of Southwest Medicine and Food, Guizhou University, Guiyang, Guizhou 550025, P. R. China.
| |
Collapse
|
14
|
Das S. Recent applications of quinolinium salts in the synthesis of annulated heterocycles. SYNOPEN 2022. [DOI: 10.1055/a-1834-2189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
Quinoline derivatives are frequently found in natural products and biologically active compounds, however, construction of quinoline fused polyheterocycles is the challenging goal in synthetic organic chemistry. In this regard, quinolinium salts meet the demand to a great level, as they can be synthesized readily and employed effectively for the rapid construction of condensed heterocyclic core. The present review focuses on recent (2015-2021) applications of different quinolinium salts that react with suitable partners to access diverse annulated products. Most of the reactions discussed here involve easily available starting materials, operationally simple, high atom efficiency and environmentally benign. Mechanistic aspects of representative transformations have also been highlighted for better understanding of reaction pathway.
Collapse
|
15
|
Han H, Li C, Niu X, Wang Y, Zhang W, Wang Q. A combination of polarity reversal, Diels-Alder cycloaddition and skeletal remodeling to access pyridine-fused nitrones. Chem Commun (Camb) 2022; 58:4775-4778. [PMID: 35343540 DOI: 10.1039/d2cc00155a] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An unprecedented cascade strategy consisting of polarity reversal, normal electron-demand Diels-Alder cycloaddition and skeletal remodeling was developed to construct novel pyridine-fused nitrones in up to 82% yield. The key to the success was the umpolung process, which transformed the electron-deficient 3-nitropyridinium ring into a reactive, π-extended cyclic nitroalkene, serving as a rarely reported hetero-diene to participate in normal Diels-Alder cycloadditions.
Collapse
Affiliation(s)
- Huabin Han
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Chaoyang Li
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Xinyue Niu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Yuxia Wang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Wenjing Zhang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Qilin Wang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| |
Collapse
|
16
|
Gu LJ, Han HB, Bu ZW, Wang QL. Dearomative Periphery Modification of Quinolinium Salts to Assemble Ring-Encumbered Pyrrolidine-Tetrahydroquinoline Polycycles. Org Lett 2022; 24:2008-2013. [PMID: 35266396 DOI: 10.1021/acs.orglett.2c00464] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
We report an unexpected dearomative periphery modification strategy for transforming quinolinium salts into structurally crowded pyrrolidine-tetrahydroquinoline polycyclic systems with complete regio- and diastereoselectivity. Importantly, the reaction pathway was regulated by simply tuning the substituents, achieving substituent-directed divergent synthesis. The notable features of this transformation include readily available starting materials, green conditions, a simple workup procedure, high bond- and ring-forming efficiency, and substituent-directed diverse synthesis.
Collapse
Affiliation(s)
- Li-Jie Gu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People's Republic of China
| | - Hua-Bin Han
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People's Republic of China
| | - Zhan-Wei Bu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People's Republic of China
| | - Qi-Lin Wang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, People's Republic of China
| |
Collapse
|
17
|
Zhang Z, Liu Y, Wang S, Zhang C, Lin J. Efficient Synthesis of 7
H
‐Chromeno[3,2‐c]quinolin‐5‐ium Salts and Quinolin‐4‐ones through Acid‐Promoted Cascade Reaction of 3‐Formylchromones and Anilines. ChemistrySelect 2022. [DOI: 10.1002/slct.202104611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhong‐Wei Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China
| | - Yue‐Ying Liu
- Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China
| | - Si‐Yu Wang
- Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China
| | - Cong‐Hai Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China
| | - Jun Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of Education Yunnan Provincial Center for Research & Development of Natural Products School of Chemical Science and Technology Yunnan University Kunming 650091 P. R. China
| |
Collapse
|
18
|
Amariucai-Mantu D, Antoci V, Sardaru MC, Al Matarneh CM, Mangalagiu I, Danac R. Fused pyrrolo-pyridines and pyrrolo-(iso)quinoline as anticancer agents. PHYSICAL SCIENCES REVIEWS 2022. [DOI: 10.1515/psr-2021-0030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Abstract
This work emphasizes the synthesis strategies and antiproliferative related properties of fused pyrrolo-pyridine (including indolizine and azaindoles) and pyrrolo-(iso)quinoline derivatives recently reported in literature.
Collapse
Affiliation(s)
| | - Vasilichia Antoci
- Chemistry Department , Alexandru Ioan Cuza University of Iasi , Iasi , Romania
| | | | | | - Ionel Mangalagiu
- Chemistry Department , Alexandru Ioan Cuza University of Iasi , Iasi , Romania
| | - Ramona Danac
- Chemistry Department , Alexandru Ioan Cuza University of Iasi , Iasi , Romania
| |
Collapse
|
19
|
Zhang YY, Li L, Ma AJ, Wang WF, Peng JB. Base-promoted [4 + 2] annulation of pyrrole-2-carbaldehyde derivatives with β,γ-unsaturated α-ketoesters: syntheses of 5,6-dihydroindolizines. Org Biomol Chem 2022; 20:8633-8637. [DOI: 10.1039/d2ob01903e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A base-promoted [4 + 2] annulation of pyrrole-2-carbaldehyde derivatives with β,γ-unsaturated α-ketoesters for the syntheses of multisubstituted 5,6-dihydroindolizines was developed.
Collapse
Affiliation(s)
- You-Ya Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Lin Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| | - Wei-Feng Wang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, People's Republic of China
| |
Collapse
|
20
|
Wang Y, Xie J, Lu P, Wang Y. Rh( ii)-catalyzed synthesis of 5 H-isochromeno[3,4- b]indolizines from 4-diazoisochroman-3-imines and pyridines. Org Biomol Chem 2022; 20:8484-8488. [DOI: 10.1039/d2ob01400a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A Rh(ii)-catalyzed (3 + 2) annulation of pyridines with 4-diazoisochroman-3-imines furnished 5H-isochromeno[3,4-b]indolizines with moderate to good yields and complete regioselectivity.
Collapse
Affiliation(s)
- Yingxiao Wang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
| | - Jianwei Xie
- Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
| | - Ping Lu
- Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
| | - Yanguang Wang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
| |
Collapse
|
21
|
Wang L, Han H, Gu L, Zhang W, Zhao J, Wang Q. Skeletal remodeling of chalcone-based pyridinium salts to access isoindoline polycycles and their bridged derivatives. Chem Sci 2021; 12:15389-15398. [PMID: 34976360 PMCID: PMC8635221 DOI: 10.1039/d1sc05741c] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 11/05/2021] [Indexed: 12/12/2022] Open
Abstract
Simultaneous deconstructive ring-opening and skeletal reconstruction of an inert, aromatic pyridinium ring is of great importance in synthetic communities. However, research in this area is still in its infancy. Here, a skeletal re-modeling strategy was developed to transform chalcone-based pyridinium salts into structurally intriguing polycyclic isoindolines through a dearomative ring-opening/ring-closing sequence. Two distinct driving forces for the deconstruction of the pyridinium core were involved in these transformations. One was the unprecedented harnessing of the instability of in situ generated cyclic β-aminoketones, and the other was the instability of the resultant N,N-ketals. The desired isoindoline polycycles could undergo the Wittig reaction with various phosphorus ylides to achieve structural diversity and complexity. Notably, by tuning the Wittig conditions by addition of one equivalent of base, an additional bridged ring was introduced. A plausible mechanism was proposed on the basis of control experiments and theoretical calculations.
Collapse
Affiliation(s)
- Lele Wang
- College of Chemistry and Chemical Engineering, Henan University Kaifeng 475004 China
| | - Huabin Han
- College of Chemistry and Chemical Engineering, Henan University Kaifeng 475004 China
| | - Lijie Gu
- College of Chemistry and Chemical Engineering, Henan University Kaifeng 475004 China
| | - Wenjing Zhang
- Green Catalysis Center, College of Chemistry, Zhengzhou University Zhengzhou 450001 China
| | - Junwei Zhao
- College of Chemistry and Chemical Engineering, Henan University Kaifeng 475004 China
| | - Qilin Wang
- College of Chemistry and Chemical Engineering, Henan University Kaifeng 475004 China
| |
Collapse
|
22
|
Tang X, Wu Y, Jiang J, Fang H, Zhou WJ, Huang W, Zhan G. Formal (3 + 1 + 1) Carboannulation of Morita-Baylis-Hillman Carbonates with Pyridinium Ylides: Access to Spiro-Cyclopentadiene Oxindoles. Org Lett 2021; 23:8937-8941. [PMID: 34752114 DOI: 10.1021/acs.orglett.1c03418] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
An efficient formal (3 + 1 + 1) carboannulation strategy of Morita-Baylis-Hillman (MBH) carbonates with pyridinium ylides was developed for constructing diversely functionalized spiro-cyclopentadiene oxindoles. The reaction initiates with an SN2' olefination of MBH carbonates with pyridinium ylides. The in situ generated dienes then engage in a challenging (4 + 1) ylide carboannulation, which has been rarely reported before. The reaction features broad substrate scope as well as high chemo- and regioselectivity. (3 + 1 + 1) carboannulation products could be easily transformed into interesting spiro-cyclopenta[c]furan oxindoles.
Collapse
Affiliation(s)
- Xue Tang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| | - Yuling Wu
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| | - Jing Jiang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| | - Huaying Fang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| | - Wu-Jingyun Zhou
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| | - Wei Huang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| | - Gu Zhan
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, People's Republic of China
| |
Collapse
|
23
|
Li Z, Lu Y, Tian YP, Han XX, Liu XW, Zhou Y, Liu XL. Diastereoselective construction of structurally diverse trifluoromethyl bispiro-[oxindole-pyrrolidine-chromanone]s through [3+2] cycloaddition reactions. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
24
|
Cui Z, Zhang K, Gu L, Bu Z, Zhao J, Wang Q. Diastereoselective trifunctionalization of pyridinium salts to access structurally crowded azaheteropolycycles. Chem Commun (Camb) 2021; 57:9402-9405. [PMID: 34528954 DOI: 10.1039/d1cc03478b] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A highly diastereoselective dearomative trifunctionalization of pyridinium salts with multifunctional o-hydroxyl aromatic azomethine ylides has been established, which not only provided a convenient and rapid method to assemble challenging and architecturally crowded chroman-pyrrolidine-hydrogenated pyridine fused pentacycles, but also represented a rare successful example of the higher-order multifunctionalization of pyridiniums.
Collapse
Affiliation(s)
- Zhaohui Cui
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Kuan Zhang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Lijie Gu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Zhanwei Bu
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Junwei Zhao
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| | - Qilin Wang
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
| |
Collapse
|
25
|
Yang L, Zhang Y, Deng J, Ma A, Zhang X, Zhang S, Peng J. Oxidative [3+2] Annulation of Pyridinium Salts with
gem
‐Difluoroalkenes: Synthesis of 2‐Fluoroindolizines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100253] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Li–Miao Yang
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
| | - You‐Ya Zhang
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
| | - Jing‐Tong Deng
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
| | - Ai‐Jun Ma
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
| | - Xiang‐Zhi Zhang
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
| | - Shu‐Yu Zhang
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
- Shanghai Key Laboratory for Molecular Engineer of Chiral Drugs & School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China
| | - Jin‐Bao Peng
- School of Biotechnology and Health Sciences Wuyi University Jiangmen, Guangdong 529020 P. R. China
| |
Collapse
|
26
|
Duan G, Liu H, Zhang L, Yuan C, Li Y, Ge Y. Access to 6-hydroxy indolizines and related imidazo[1,5-a]pyridines through the SN2 substitution/condensation/tautomerization cascade process. RSC Adv 2021; 11:25624-25627. [PMID: 35478892 PMCID: PMC9036982 DOI: 10.1039/d1ra04425g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Accepted: 07/19/2021] [Indexed: 11/21/2022] Open
Abstract
A simple and efficient cascade reaction was developed for the construction of hydroxy substituted indolizines from pyrrole-2-carbaldehydes and commercially available 4-halogenated acetoacetic esters.
Collapse
Affiliation(s)
- Guiyun Duan
- Department of Pharmacy
- Shandong First Medical University
- Shandong Academy of Medical Sciences
- Taian
- P. R. China
| | - Hao Liu
- Department of Pharmacy
- Shandong First Medical University
- Shandong Academy of Medical Sciences
- Taian
- P. R. China
| | - Liqing Zhang
- Department of Pharmacy
- Shandong First Medical University
- Shandong Academy of Medical Sciences
- Taian
- P. R. China
| | - Chunhao Yuan
- Department of Pharmacy
- Shandong First Medical University
- Shandong Academy of Medical Sciences
- Taian
- P. R. China
| | - Yongchao Li
- Department of Pharmacy
- Shandong First Medical University
- Shandong Academy of Medical Sciences
- Taian
- P. R. China
| | - Yanqing Ge
- Department of Pharmacy
- Shandong First Medical University
- Shandong Academy of Medical Sciences
- Taian
- P. R. China
| |
Collapse
|
27
|
Xu FS, Yan C, Sun J, Yan CG. Efficient synthesis of tetra- and penta-substituted benzenes via a domino annulation reaction of a pyridinium ylide and chalcone o-enolate. NEW J CHEM 2021. [DOI: 10.1039/d1nj03772b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A very simple and highly efficient protocol for synthesizing tetra- and penta-substituted benzene derivatives has been developed.
Collapse
Affiliation(s)
- Feng-Shun Xu
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Chen Yan
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Jing Sun
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Chao-Guo Yan
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| |
Collapse
|