1
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Tan P, Lu L, Wang S, Wang J, Chen J, Zhang Y, Xie L, Yang S, Chen J, Zhang Z. Photo- or Electrochemical Cyclization of Dienes with Diselenides to Access Seleno-Benzo[ b]azepines. J Org Chem 2023. [PMID: 37220067 DOI: 10.1021/acs.joc.3c00475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A cascade selenylation/cyclization of dienes with diselenides has been realized under visible-light irradiation or electrolysis conditions. Employing O2 or electricity as a "green" oxidant, this protocol provides a green and efficient method for an array of biologically important seleno-benzo[b]azepine derivatives in moderate to good yields. The direct sunlight irradiation and gram-scale reaction render the approach practical and attractive.
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Affiliation(s)
- Pengpeng Tan
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Liwang Lu
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Shilong Wang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Junxin Wang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Jiayang Chen
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Yijia Zhang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Lei Xie
- School of Pharmaceutical Sciences, Liaocheng University, Liaocheng 252000, P. R. China
| | - Shubin Yang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Jinchun Chen
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
| | - Zhen Zhang
- College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, P. R. China
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2
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Du S, Jiang S, Yang R, Jin F, Huang H, Tian WF, Zhou ZZ, Song XR, Xiao Q. Direct Synthesis of Benzo[ b]fluorenyl Thiophosphates via Tandem Cyclization of Diynols with (RO) 2P(O)SH. Org Lett 2023. [PMID: 36795512 DOI: 10.1021/acs.orglett.3c00009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
A general and metal-free protocol for the construction of benzo[b]fluorenyl thiophosphates was developed through the cascade cyclization of easily prepared diynols and (RO)2P(O)SH, with water as the only byproduct. The novel transformation involved the allenyl thiophosphate as the key intermediate, followed by Schmittel-type cyclization to achieve the desired products. Notably, (RO)2P(O)SH acted not only as a nucleophile but also as an acid-promoter to initiate the reaction.
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Affiliation(s)
- Sha Du
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Shimin Jiang
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Ruchun Yang
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Fengyan Jin
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Haiyang Huang
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Wan-Fa Tian
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Zhao-Zhao Zhou
- College of Chemistry and Food Science, Nanchang Normal University, Nanchang, 330000, P.R. China
| | - Xian-Rong Song
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
| | - Qiang Xiao
- Institute of Organic Chemistry, Jiangxi Science & Technology Normal University, Key Laboratory of Organic Chemistry, Nanchang 330013, Jiangxi Province, P.R. China
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3
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Goulart TAC, Back DF, Moura E Silva S, Zeni G. Palladium-Catalyzed Cascade 5- endo-dig Cyclization of Ynamides to Form 4-Alkynyloxazolones. J Org Chem 2022; 87:3341-3351. [PMID: 35167299 DOI: 10.1021/acs.joc.1c02978] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The selective synthesis of 4-alkynyloxazolones and their further applications as substrates to electrophile-promoted nucleophilic cyclization have been developed. The reaction of ynamides with terminal alkynes proceeded smoothly to give 4-alkynyloxazolones in the presence of a catalytic amount of palladium(II) acetate. The products were obtained with the sequential formation of new C-C and C-O bonds via a cascade procedure. The first step involved a carbon-oxygen bond formation, via a 5-endo-dig closure, which was confirmed by X-ray analyses of the crystalline sample. Subsequently, the reaction of 4-alkynyloxazolones with an electrophilic selenium source gave 3-phenylselanyl benzofuran derivatives via an electrophile-promoted nucleophilic cyclization.
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Affiliation(s)
- Tales A C Goulart
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios CCNE, UFSM, Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - Davi Fernando Back
- Laboratório de Materiais Inorgânicos, Departamento de Química, UFSM, Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - Sidnei Moura E Silva
- Laboratório de Biotecnologia de Produtos Naturais e Sintéticos, Instituto de Biotecnologia, Universidade de Caxias do Sul, Caxias do Sul, Rio Grande do Sul 95070-560, Brazil
| | - Gilson Zeni
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios CCNE, UFSM, Santa Maria, Rio Grande do Sul 97105-900, Brazil
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4
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Guo T, Wang H, Cao C, Chen K, Liu Y, Zhang P, Zhao Y, Ma Y. Highly Efficient and Eco‐Benign Synthesis of 3‐Imidazoheterocyclic‐Substituted Phthalides/Isoindolinones in Water under Catalyst‐ and Additive‐Free Conditions. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000308] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Tao Guo
- School of Chemistry and Chemical Engineering Henan University of Technology 450001 Zhengzhou Henan P. R. China
| | - Hui‐Jie Wang
- School of Chemistry and Chemical Engineering Henan University of Technology 450001 Zhengzhou Henan P. R. China
| | - Can‐Can Cao
- School of Chemistry and Chemical Engineering Henan University of Technology 450001 Zhengzhou Henan P. R. China
| | - Kuo‐Hong Chen
- School of Chemistry and Chemical Engineering Henan University of Technology 450001 Zhengzhou Henan P. R. China
| | - Yu Liu
- School of Chemistry and Chemical Engineering Henan University of Technology 450001 Zhengzhou Henan P. R. China
| | - Pan‐Ke Zhang
- College of Chemistry, and Institute of Green Catalysis, Henan Institute of Advanced Technology Zhengzhou University 450001 Zhengzhou Henan P. R. China
| | - Yun‐Hui Zhao
- School of Chemistry and Chemical Engineering Hunan University of Science and Technology 411201 Xiangtan Hunan P. R. China
| | - Yong‐Cheng Ma
- Pharmacy Department Fuwai Centeral China Cardiovascular Hospital No.1, Fuwai Road 451464 Zhengzhou Henan P. R. China
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5
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Chiarotto I, Mattiello L, Feroci M. The Electrogenerated Cyanomethyl Anion: An Old Base Still Smart. Acc Chem Res 2019; 52:3297-3308. [PMID: 31714056 DOI: 10.1021/acs.accounts.9b00465] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The cathodic reduction of acetonitrile solutions containing a tetraalkylammonium salt leads to the formation of the cyanomethyl anion (-CH2CN, cyanomethanide). This electrolysis can be carried out under very simple experimental conditions (constant-current electrolyses), using various cathodic materials, controlling the amount of base by simply controlling the amount of charge. Despite the fact that the mechanism for this electrochemical reaction is still debated (and it depends on the cathodic material), the outcome of the electrolysis is the formation of a strong base, -CH2CN (pKa 31.3 for acetonitrile in DMSO). The chemical behavior of this electrogenerated base (EGB) strongly depends on its counterion, which in this case is a tetraalkylammonium cation, with a low charge density and thus not coordinated. The very weak interaction between R4N+ and -CH2CN renders the cyanomethyl anion a "naked" ion, and thus highly reactive. In particular, the cyanomethyl anion can react as a base and as a nucleophile. In the first case, it behaves as a strong base and, after deprotonation of a weak acidic substrate, transforms itself into a solvent molecule, acetonitrile, thus generating no byproducts. In the second case, the reactivity as a nucleophile of the cyanomethyl anion obviously depends on the reaction partner. When an electrophile is present in the reaction mixture, a cyanomethylation is obtained (e.g., with aromatic aldehydes, possessing no acidic hydrogen atoms, which undergo nucleophilic attack on the carbonyl carbon atom by -CH2CN); on the contrary, when no reagent is present other than acetonitrile and tetraalkylammonium salt, an attack on the parent molecule leads to the acetonitrile dimer, 3-aminocrotononitrile, which in turn can behave as a base and/or as a nucleophile. In this regard, some authors report that it is preferable to carry out the electrogeneration of the cyanomethyl anion under different experimental conditions, i.e., using an undivided cell and a sacrificial magnesium anode. In this way, a Grignard-type reagent is formed (Mg(CH2CN)2) which highly stabilizes the cyanomethyl anion, preventing its dimerization. It should be noted that in our laboratory the electrogenerated tetraalkylammonium cyanomethanide was extensively used in various reactions (both acid-base and nucleophile-electrophile, vide infra), and in almost no case, the amount of acetonitrile dimer formed exceeded 5%, confirming the validity of this electrochemical methodology to generate a very efficient base. Moreover, when in the reaction mixture both a weak acid and an electrophile are present, the prevalent reactivity of the cyanomethyl anion is as a base, leaving the possibility of a cyanomethylation reaction to those cases in which no acidic substrate is present. We have successfully used the electrogenerated cyanomethyl anion in many base-induced reactions, as the synthesis of the β-lactam ring (chiral or not), the insertion of carbon dioxide into amines and amino alcohols, the activation of elemental sulfur and insertion into carbonyl compounds, the selective alkylation of difunctional compounds, etc.
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Affiliation(s)
- Isabella Chiarotto
- Dipartimento di Scienze di Base e Applicate per l’Ingegneria (SBAI), Sapienza University of Rome, via del Castro Laurenziano, 7, 00161, Roma, Italy
| | - Leonardo Mattiello
- Dipartimento di Scienze di Base e Applicate per l’Ingegneria (SBAI), Sapienza University of Rome, via del Castro Laurenziano, 7, 00161, Roma, Italy
| | - Marta Feroci
- Dipartimento di Scienze di Base e Applicate per l’Ingegneria (SBAI), Sapienza University of Rome, via del Castro Laurenziano, 7, 00161, Roma, Italy
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6
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Guo W, Zhao M, Tan W, Zheng L, Tao K, Chen L, Wang M, Chen D, Fan X. Base-Promoted Metal-/Oxidant-Free Three-Component Tandem Annulation: A Strategy for the Construction of 2,4,5-Trisubstituted Thiazoles via C−N Bond Cleavage of Amidines. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800417] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Wei Guo
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Mingming Zhao
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Wen Tan
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Lvyin Zheng
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Kailiang Tao
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Luyan Chen
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Mingfeng Wang
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Deliang Chen
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
| | - Xiaolin Fan
- Key Laboratory of Organo-pharmaceutical Chemistry of Jiangxi Province; Gannan Normal University; Ganzhou 341000 P. R. China
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7
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Das UK, Shimon LJW, Milstein D. Imidazole synthesis by transition metal free, base-mediated deaminative coupling of benzylamines and nitriles. Chem Commun (Camb) 2017; 53:13133-13136. [DOI: 10.1039/c7cc08322j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
An unprecedented transition metal free, base-mediated deaminative coupling of benzylamines and nitriles is reported. This protocol provides a practical strategy for the synthesis of 2,4,5-tri-substituted imidazoles with liberation of NH3.
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Affiliation(s)
- Uttam Kumar Das
- Department of Organic Chemistry, Weizmann Institute of Science
- Rehovot 76100
- Israel
| | - Linda J. W. Shimon
- Department of Chemical Research Support, Weizmann Institute of Science
- Rehovot 76100
- Israel
| | - David Milstein
- Department of Organic Chemistry, Weizmann Institute of Science
- Rehovot 76100
- Israel
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8
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Rathore V, Sattar M, Kumar R, Kumar S. Synthesis of Unsymmetrical Diaryl Acetamides, Benzofurans, Benzophenones, and Xanthenes by Transition-Metal-Free Oxidative Cross-Coupling of sp3 and sp2 C–H Bonds. J Org Chem 2016; 81:9206-9218. [DOI: 10.1021/acs.joc.6b01771] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Vandana Rathore
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
| | - Moh. Sattar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
| | - Raushan Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP 462 066, India
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9
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Sattar M, Praveen, Durga Prasad C, Verma A, Kumar S, Kumar S. Palladium‐Catalyzed CH Functionalization of Ferrocenecarboxylic Acid by using 8‐Aminoquinoline as a Removable Directing Group. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500791] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Moh. Sattar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP – 462 066, India
| | - Praveen
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP – 462 066, India
| | - Ch. Durga Prasad
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP – 462 066, India
| | - Ajay Verma
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP – 462 066, India
| | - Shailesh Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP – 462 066, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal, MP – 462 066, India
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10
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Verma A, Jana S, Durga Prasad C, Yadav A, Kumar S. Organoselenium and DMAP co-catalysis: regioselective synthesis of medium-sized halolactones and bromooxepanes from unactivated alkenes. Chem Commun (Camb) 2016; 52:4179-82. [DOI: 10.1039/c5cc10245f] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A co-catalytic system has been developed for the synthesis of medium-sized halolactones and bromooxepanes possessing high transannular strain. Mechanistic studies reveal that quaternary selenium intermediate is involved in catalysis.
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Affiliation(s)
- Ajay Verma
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India
| | - Sadhan Jana
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India
| | - Ch. Durga Prasad
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India
| | - Abhimanyu Yadav
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India
| | - Sangit Kumar
- Department of Chemistry
- Indian Institute of Science Education and Research (IISER) Bhopal
- Bhopal
- India
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