1
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Tsybulin SV, Kaplanskiy MV, Antonov AS. Transition-Metal-Free Synthesis of 2-Substituted Benzo[cd]Indoles via the Reaction of 1-Halo-8-lithionaphthalenes with Nitriles. Chemistry 2024; 30:e202303768. [PMID: 38197193 DOI: 10.1002/chem.202303768] [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: 11/13/2023] [Revised: 01/09/2024] [Accepted: 01/10/2024] [Indexed: 01/11/2024]
Abstract
A simple and effective organolithium approach to the synthesis of 2-substituted benzo[cd]indoles from peri-dihalonaphthalenes and nitriles has been developed. The reaction proceeds via a surprisingly easy intramolecular aromatic nucleophilic substitution facilitated by the "clothespin effect". The discovered transformation provides good isolated yields, allows usage of an extensive range of nitriles, and demonstrates a good substituents tolerance. UV-absorption and NMR spectra of the obtained benzo[cd]indoles and their protonated forms demonstrated exclusive protonation to the indole nitrogen atom even in the presence of two NMe2 groups in positions 5 and 6 (i. e. "proton sponge" moiety).
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Affiliation(s)
- Semyon V Tsybulin
- St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Mark V Kaplanskiy
- St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Alexander S Antonov
- Institute of Organic Chemistry, University of Regensburg, D-93053, Regensburg, Germany
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2
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Liang G, Anderson EA. Sequencing palladium-catalyzed cycloisomerization cascades in a synthesis of the gelsemine core. Chem Sci 2023; 14:6970-6974. [PMID: 37389268 PMCID: PMC10306092 DOI: 10.1039/d3sc01353g] [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: 03/13/2023] [Accepted: 06/05/2023] [Indexed: 07/01/2023] Open
Abstract
Transition metal-catalyzed cycloisomerization is a powerful strategy for the construction of cyclic organic molecules, and the use of palladium catalysts can deliver a wide range of monocyclic and bicyclic products. However, applications of cycloisomerizations in complex target synthesis in which more than one cycloisomerization process is deployed in a cascade context are rare. Here we report investigations of the relative rates of two different types of ene-ynamide cycloisomerization that form fused and spirocyclic rings, and use of these results to design a sequence-controlled cascade cycloisomerization that prepares the tetracyclic core of gelsemine in a single step. Crucial to this work was an evaluation of the kinetics of each cycloisomerization in competition experiments, which revealed a key influence of the ynamide electron-withdrawing group on the cycloisomerization reaction.
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Affiliation(s)
- Guoduan Liang
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK
| | - Edward A Anderson
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK
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3
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Yu M, Jin T, Wang X, Li H, Ji D, Yao J, Zeng H, Shi S, Xu K, Zhang L. Regioselective intramolecular cyclization of o-alkynyl arylamines with the in situ formation of ArXCl to construct poly-functionalized 3-selenylindoles. RSC Adv 2023; 13:6210-6216. [PMID: 36825294 PMCID: PMC9941895 DOI: 10.1039/d3ra00030c] [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: 01/03/2023] [Accepted: 02/15/2023] [Indexed: 02/23/2023] Open
Abstract
In this article, a practical and metal-free method for the synthesis of poly-functionalized 3-selenyl/sulfenyl/telluriumindoles from o-alkynyl arylamines has been achieved. In this protocol, the in situ formation of selenenyl chloride, sulfenyl chloride or tellurenyl chloride is considered as the key intermediate and the 3-selenyl/sulfenyl/telluriumindoles can be obtained in good to excellent yields. Furthermore, the product 2-phenyl-3-(phenylselanyl)-1-tosyl-1H-indole can be selectively oxidized to compounds 2-phenyl-3-(phenylseleninyl)-1-tosyl-1H-indole and 2-phenyl-3-(phenylselenonyl)-1-tosyl-1H-indole in good yields.
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Affiliation(s)
- Minhui Yu
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China .,College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang China
| | - Tao Jin
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
| | | | - Haohu Li
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
| | - Decai Ji
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
| | - Jinzhong Yao
- College of Biological, Chemical Sciences and Engineering, Jiaxing University Jiaxing 314001 Zhejiang China
| | - Heyang Zeng
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
| | - Senlei Shi
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
| | - Kaimeng Xu
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
| | - Lianpeng Zhang
- Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products, Southwest Forestry University Kunming 650224 Yunnan China
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4
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Wang X, Zeng H, Zhang W, Guo H, Jin T, Shi S, Jin X, Qu N, Liu L, Zhang L. Copper-catalyzed construction of ( Z)-benzo[ cd]indoles: stereoselective intramolecular trans-addition and S N-Ar reaction. Org Biomol Chem 2022; 20:7949-7955. [PMID: 36178274 DOI: 10.1039/d2ob01488b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Substituted benzo[cd]indoles are one of the most attractive frameworks because of their wide range of biological and optical activities. Herein, a copper-catalyzed one-step synthesis of biologically important polysubstituted benzo[cd]indoles starting from 8-alkynyl-1-naphthylamine derivatives is reported. In this protocol, many substituents tolerated the reaction conditions and produced (Z)-benzo[cd]indoles in good yields. Preliminary mechanistic studies indicated that the reaction proceeds via a stereoselective intramolecular trans-addition and SN-Ar reaction with high selectivity and high yields. The synthesized polysubstituted (Z)-benzo[cd]indoles possess sulfonamide building blocks, which make them candidates for bioactive molecules.
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Affiliation(s)
- Xinyue Wang
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China. .,College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Heyang Zeng
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Wenli Zhang
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Haiyang Guo
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Tao Jin
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Senlei Shi
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Xiaoyuan Jin
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Na Qu
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Li Liu
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
| | - Lianpeng Zhang
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.
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5
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Diao H, Liu L, Wang J, Lin Y, Zhao X, Zeng H, Shi S, Gao W, Yang L, Du G, Zhang L. Cupric Halide‐Promoted Stereoselective Intramolecular cis‐Addition to Construct (Z)‐Chloro(Bromo)benzo[c,d]indoles. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hanying Diao
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Li Liu
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Jin Wang
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Yanfei Lin
- Jiaxing University College of Biological, Chemical Sciences and Engineering CHINA
| | - Xiangyuan Zhao
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Heyang Zeng
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Senlei Shi
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Wei Gao
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Long Yang
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Guanben Du
- Southwest Forestry University Yunnan Key Laboratory of Wood Adhesive and Glued Products CHINA
| | - Lianpeng Zhang
- Jiaxing University Chemistry Jiahang Road 138 314001 Jiaxing CHINA
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6
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Zhang Y, Liu T, Liu L, Guo H, Zeng H, Bi W, Qiu G, Gao W, Ran X, Yang L, Du G, Zhang L. Palladium-Catalyzed Preparation of N-Substituted Benz[ c, d]indol-2-imines and N-Substituted Amino-1-naphthylamides. J Org Chem 2022; 87:8515-8524. [PMID: 35731803 DOI: 10.1021/acs.joc.2c00620] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Here, we report a novel and facile protocol for the synthesis of benz[c,d]indol-2-imines via palladium-catalyzed C-C and C-N coupling of 8-halo-1-naphthylamines with isocyanides in a single step. The reaction features broad substrate scopes and mild conditions, providing an efficient alternative for the construction of antiproliferative agents and BET bromodomain inhibitors. If 0.1 mL of H2O was added to this reaction, the N-substituted amino-1-naphthylamides could be obtained easily.
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Affiliation(s)
- Yuan Zhang
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China.,College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Tongda Liu
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Li Liu
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Haiyang Guo
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Heyang Zeng
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Wei Bi
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Guanyinsheng Qiu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Wei Gao
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Xin Ran
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Long Yang
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Guanben Du
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
| | - Lianpeng Zhang
- Yunnan Key Laboratory of Wood Adhesive and Glued Products, Southwest Forestry University, Kunming 650224, Yunnan, China
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7
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Li HH, Zhang YP, Zhai TY, Liu BY, Shi CY, Zhou JM, Ye LW. Metal-free dearomatization reactions of naphthol-ynamides for the divergent and enantioselective synthesis of azaspirocycles. Org Chem Front 2022. [DOI: 10.1039/d2qo00685e] [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 efficient Brønsted acid (BA) catalyzed intramolecular dearomatization cyclization of naphthol-ynamides has been developed, enabling the practical and divergent synthesis of two azaspirocycles in high yields.
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Affiliation(s)
- Hang-Hao Li
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Yi-Ping Zhang
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Tong-Yi Zhai
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Bin-Yang Liu
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Chong-Yang Shi
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Jin-Mei Zhou
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Long-Wu Ye
- Key Laboratory for Chemical Biology of Fujian Province and State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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8
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Zhang Y, Lai W, Zhang L, Gao X, Qiu G, Zhou H. The copper-catalyzed synthesis of ( Z)-2 H-naphtho[1,8- bc]thiophenes with solid emission. Org Biomol Chem 2021; 19:1827-1834. [PMID: 33565557 DOI: 10.1039/d0ob02233k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In recent years, one of the main research interests of our group has been the construction of 6/5 π-systems through the regioselective conversion of parallel alkynes in naphthalene with the aim of exploiting potential fluorescent materials. Herein, the copper-catalyzed synthesis of polysubstituted (Z)-2H-naphtho[1,8-bc]thiophenes from 8-halo-1-ethynylnaphthalenes using potassium ethylxanthate as the sulfur source is reported. In this protocol, a series of thiophene-fused 6/5 π-system compounds was synthesized via copper-catalyzed Ullmann-type C(aryl)-S bond formation and the α-addition of an alkyne bond with high selectivity and in high yields. The synthesized polysubstituted (Z)-2H-naphtho[1,8-bc]thiophenes exhibited solid emission, which made them potential candidates for use in optoelectronic conjugated materials. By using DMSO/D2O (3 : 1) as the reaction solvent, the deuterated products could be obtained in good yields under standard conditions.
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Affiliation(s)
- Yuan Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Weiping Lai
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Lianpeng Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China. and School of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China.
| | - Xiaoxing Gao
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Guanyinsheng Qiu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
| | - Hongwei Zhou
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China.
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9
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Banik T, Kaliappan KP. A Serendipitous One-Pot Cyanation/Hydrolysis/Enamide Formation: Direct Access to 3-Methyleneisoindolin-1-ones. Chemistry 2021; 27:628-633. [PMID: 32812249 DOI: 10.1002/chem.202003209] [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: 07/07/2020] [Revised: 08/14/2020] [Indexed: 11/07/2022]
Abstract
A direct, one-pot conversion of 2'-haloacetophenones to 3-methyleneisoindolin-1-one scaffolds using CuCN as the sole reagent without the need for moisture-free or anaerobic conditions is reported. This serendipitously discovered transformation with a broad substrate scope provides a significantly different route towards these important scaffolds. The scope of the method has also been further extended towards the synthesis of three special scaffolds, which are analogous to various bio-active drugs.
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Affiliation(s)
- Trisha Banik
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
| | - Krishna P Kaliappan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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10
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Similarities and differences in the mechanisms alkyne and isonitrile transformations catalyzed by silver ions and nanoparticles. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2020.111258] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Chen X, Zhang L, Wang Y, Qiu G, Liang Q, Zhou H. Copper-Catalyzed Tandem Radical Cyclization of 8-Ethynyl-1-naphthyl-amines for the Synthesis of 2 H-Benzo[ e][1,2]thiazine 1,1-Dioxides and its Fluorescence Properties. J Org Chem 2020; 85:12526-12534. [PMID: 32894946 DOI: 10.1021/acs.joc.0c01725] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A copper-catalyzed radical cascade dehydrogenative cyclization of N-tosyl-8-ethynyl-1-naphthylamines under air is described herein for the synthesis of thioazafluoranthenes. The reaction proceeds smoothly with high efficiency and a broad reaction scope. The product is indeed a new fluorophore and its photophysical properties are also investigated. Based on the results, we are pleased to find that the Stokes shift of amino-linked thioazafluoranthenes in dilute tetrahydrofuran is determined to be 143 nm (4830 cm-1).
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Affiliation(s)
- Xia Chen
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Lianpeng Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Yuzhe Wang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Guanyinsheng Qiu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Qinghui Liang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
| | - Hongwei Zhou
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, Zhejiang, China
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12
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Li M, Wu W, Jiang H. Recent Advances in Silver‐Catalyzed Transformations of Electronically Unbiased Alkenes and Alkynes. ChemCatChem 2020. [DOI: 10.1002/cctc.202000743] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Meng Li
- State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
| | - Wanqing Wu
- State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou 510640 P. R. China
- State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 P. R. China
| | - Huanfeng Jiang
- State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 P. R. China
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13
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Rej S, Chatani N. Rh III -Catalyzed Double Dehydrogenative Coupling of Free 1-Naphthylamines with α,β-Unsaturated Esters. Chemistry 2020; 26:11093-11098. [PMID: 32239540 DOI: 10.1002/chem.202000706] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Indexed: 11/08/2022]
Abstract
The RhIII -catalyzed, consecutive double C-H oxidative coupling of free 1-naphthylamine and α,β-unsaturated esters through C-H/C-H and C-H/N-H bonds is reported. The one step reaction leads to the formation of biologically important alkylidene-1,2-dihydrobenzo[cd]indoles scaffolds. This efficient process is much more synthetically convenient and useful than others because the starting materials, such as 1-naphthylamine derivatives are readily available and the free amine serves as a directing group.
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Affiliation(s)
- Supriya Rej
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
| | - Naoto Chatani
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan
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14
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Hua Y, Chen ZY, Diao H, Zhang L, Qiu G, Gao X, Zhou H. Copper-Catalyzed Preparation of Benzo[3,4]indolo[1,2- b]isoquinoline-8-ones and Photoluminescence Exploration. J Org Chem 2020; 85:9614-9621. [PMID: 32657128 DOI: 10.1021/acs.joc.0c00936] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A facile synthesis of benzo[3,4]indolo[1,2-b]isoquinolin-8-ones is described. Under copper catalysis, the reaction proceeds with a high efficiency and a broad reaction scope. A deuteration experiment shows that the KIE value is 2.85. From the results on mechanism studies, copper-catalyzed C-H activation, intramolecular cis-addition of alkynes, and reductive elimination are involved. Moreover, this skeleton is indeed a new fluorophore, and its photophysical properties are also investigated.
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Affiliation(s)
- Yiwen Hua
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
| | - Zi-Yan Chen
- School of Medicine, Jiaxing University, Jiaxing 314001, China
| | - Hanying Diao
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
| | - Lianpeng Zhang
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China.,School of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Guanyinsheng Qiu
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
| | - Xiaoxing Gao
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
| | - Hongwei Zhou
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, China
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15
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Cao Z, Zhu J, Liu L, Pang Y, Tian L, Sun X, Meng X. AgNTf 2-catalyzed formal [3 + 2] cycloaddition of ynamides with unprotected isoxazol-5-amines: efficient access to functionalized 5-amino-1 H-pyrrole-3-carboxamide derivatives. Beilstein J Org Chem 2019; 15:2623-2630. [PMID: 31807197 PMCID: PMC6880818 DOI: 10.3762/bjoc.15.255] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 10/15/2019] [Indexed: 12/13/2022] Open
Abstract
A formal [3 + 2] cycloaddition between ynamides and unprotected isoxazol-5-amines has been developed in the presence of catalytic AgNTf2 in an open flask. By the protocol, a variety of functionalized 5-amino-1H-pyrrole-3-carboxamide derivatives can be obtained in up to 99% yield. The reaction mechanism might involve the generation of an unusual α-imino silver carbene intermediate (or a silver-stabilized carbocation) and subsequent cyclization/isomerization to build the significant pyrrole-3-carboxamide motif. The reaction features the use of an inexpensive catalyst, simple reaction conditions, simple work-up without column chromatographic purification for most of products and high yields.
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Affiliation(s)
- Ziping Cao
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Jiekun Zhu
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Li Liu
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Yuanling Pang
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Laijin Tian
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
- Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Shandong Key Laboratory of Life-Organic Analysis, Qufu 273165, P. R. China
| | - Xuejun Sun
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
| | - Xin Meng
- Qufu Normal University, School of Chemistry and Chemical Engineering, Qufu 273165, P. R. China
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Sreedevi R, Saranya S, Anilkumar G. Recent Trends in the Silver‐Catalyzed Synthesis of Nitrogen Heterocycles. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900599] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Radhakrishnan Sreedevi
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P. O. Kottayam, Kerala 686560 India
| | - Salim Saranya
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P. O. Kottayam, Kerala 686560 India
| | - Gopinathan Anilkumar
- School of Chemical SciencesMahatma Gandhi University Priyadarsini Hills P. O. Kottayam, Kerala 686560 India
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