1
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Banda BP, Medishetti N, Nanubolu JB, Atmakur K. One-pot domino synthesis of five- and six-membered fused dihydropyridines promoted by PPh 3-NBS in aqueous medium. Org Biomol Chem 2023; 21:4434-4439. [PMID: 37183547 DOI: 10.1039/d3ob00472d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
A facile one-pot synthesis of five- and six-membered fused dihydropyridines such as chromenodihydropyridines, pyrazolodihydropyridines and isoxazolopyridines was accomplished for the first time by employing PPh3-NBS via a formal [3 + 2 + 1] cycloaddition of 1,3-bisnucleophiles (i.e., 2-aminochromone, 4-aminochromone, 5-aminopyrazole and 5-aminoisoxazole), β-enaminones and aldehydes in aqueous medium. The present approach involves a Michael type addition followed by intramolecular cyclization leading to the formation of two new C-C bonds and one C-N bond. High compatibility and excellent yields are the advantages of this protocol.
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Affiliation(s)
- Bhanu Prasad Banda
- Fluoro & Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, India.
| | - Nagaraju Medishetti
- Fluoro & Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
| | - Jagadeesh Babu Nanubolu
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
- Laboratory of X-ray Crystallography, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500 007, India
| | - Krishnaiah Atmakur
- Fluoro & Agrochemicals Department, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, 500 007, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, Uttar Pradesh, 201002, India
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2
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Xu Z, Liang X, Li H. Oxidative Radical Transnitrilation of Arylboronic Acids with Trityl Isocyanide. Org Lett 2022; 24:9403-9407. [PMID: 36519782 DOI: 10.1021/acs.orglett.2c03778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We report a radical transnitrilation of arylboronic acids with trityl isocyanide in the presence of manganese(III) acetate. Many functional groups can be tolerated in this transformation, and a special positive effect of benzoic acid in this reaction has been observed.
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Affiliation(s)
- Zhiyuan Xu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
| | - Xiaojuan Liang
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
| | - Huan Li
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang 325035, China
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3
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Han Y, Jiang W, Zhang J, Peng J, Chen C. Visible-Light-Promoted Palladium-Catalyzed C—H Amination for the Synthesis of Carbazolequinones. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202104037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Fernando EHN, Cortes Vazquez J, Davis J, Luo W, Nesterov VN, Wang H. Can Primary Arylamines Form Enamine? Evidence, α-Enaminone, and [3+3] Cycloaddition Reaction. J Org Chem 2021; 86:14617-14626. [PMID: 34610241 DOI: 10.1021/acs.joc.1c01462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The formation of enamine from primary arylamines was detected and confirmed by nuclear magnetic resonance spectroscopy. The presence of a radical quencher, e.g., (2,2,6,6-tetramethylpiperidin-1-yl)oxidanyl, was found to be essential for the detection of enamine formation. A direct synthesis of α-enaminones from primary arylamines and ketones was also developed. Mechanistic investigation of α-enaminone formation suggests that an amine radical cation generated through O2 singlet energy transfer was involved in initiating α-enaminone formation. The reactivity and utility of α-enaminones were explored with a [3+3] cycloaddition reaction of enones affording dihydropyridines in good yields (58-85%). α-Enaminones displayed a set of reactivities that is different from that of enamines. The knowledge gained in this work advances our basic understanding of organic chemistry, providing insights and new opportunities in enamine catalysis.
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Affiliation(s)
- E H Nisala Fernando
- Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
| | - Jose Cortes Vazquez
- Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
| | - Jacqkis Davis
- Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
| | - Weiwei Luo
- School of Chemistry and Food Engineering, University of Science and Technology, Changsha 410114, China
| | - Vladimir N Nesterov
- Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
| | - Hong Wang
- Department of Chemistry, University of North Texas, Denton, Texas 76203, United States
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5
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Polimera SR, A M Subbaiah M, Ilangovan A. The Ligand Free Palladium(II)-Catalyzed Regioselective 1,2-Addition of Enol Silanes to Quinones to Access 4-Hydroxy-4-(2-oxo-2-arylethyl)cyclohexadien-1-ones and Synthetic Applications. J Org Chem 2021; 86:14356-14370. [PMID: 34554740 DOI: 10.1021/acs.joc.1c00857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In contrast to the conventional 1,4-addition process, regioselective 1,2-addition of silyl enol ethers to quinones can now be achieved via a palladium(II) enolate pathway that provides access to 4-hydroxy-4-(2-oxo-2-arylethyl)cyclohexa-2,5-dien-1-one derivatives. This quinone alkylation protocol proceeds under mild reaction conditions at ambient temperature under open air and does not require either an external ligand for the palladium or the use of a base. Additionally, the cyclohexadienone products have been exploited as synthetic precursors for the construction of fused heteroaryl systems.
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Affiliation(s)
- Subba Rao Polimera
- Department of Medicinal Chemistry, BBRC, Syngene, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore 560009, India.,Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli, Tamil Nadu 620024, India
| | - Murugaiah A M Subbaiah
- Department of Medicinal Chemistry, BBRC, Syngene, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore 560009, India
| | - Andivelu Ilangovan
- Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli, Tamil Nadu 620024, India
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6
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New 2-Acetyl-3-aminophenyl-1,4-naphthoquinones: Synthesis and In Vitro Antiproliferative Activities on Breast and Prostate Human Cancer Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:8939716. [PMID: 33101594 PMCID: PMC7574025 DOI: 10.1155/2020/8939716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 07/27/2020] [Accepted: 08/28/2020] [Indexed: 11/17/2022]
Abstract
The reaction of 2-acyl-1,4-naphthoquinones with N,N-dimethylaniline and 2,5-dimethoxyaniline, promoted by catalytic amounts of CeCl3·7H2O under “open-flask” conditions, produced a variety of 2-acyl-3-aminophenyl-1,4-naphthoquinones structurally related to the cytotoxic 2-acetyl-3-phenyl-1,4-naphthoquinone, an inhibitor of the heat shock chaperone protein Hsp90. The members of the 2-acyl-3-aminophenyl-1,4-naphthoquinone series were isolated in good yields (63-98%). The cyclic voltammograms of the 2-acyl-3-aminophenyl-1,4-naphthoquinone exhibit two one-electron reduction waves to the corresponding radical-anion and dianion and two quasireversible oxidation peaks. The first and second half-wave potential values (E1/2) of the members of the series are sensitive to the push-pull electronic effects of the substituents in the naphthoquinone scaffold. Furthermore, the in vitro antiproliferative properties of these new quinones were evaluated on two human cancer cells DU-145 (prostate) and MCF-7 (mammary) and a nontumorigenic HEK-293 (kidney) cell line, using the MTT colorimetric method. Two members, within the series, exhibited interesting cytotoxic activities on human prostate and mammary cancer cells.
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7
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Pandaram S, T P AK, Ilangovan A. The silver catalyzed direct C-H functionalization of quinones with dialkyl amides. Org Biomol Chem 2020; 18:3027-3031. [PMID: 32239012 DOI: 10.1039/d0ob00323a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
DMA and other dialkylamides were successfully used as synthons for the C-H functionalization of quinones. This novel amidoalkylation reaction works with a variety of substituted quinones and dialkyl/alkyl amides, such as DMF, NMP and NMA, and the corresponding products were obtained in moderate to good yields. The amidoalkylation of quinones is demonstrated for the first time. A suitable mechanism and the synthetic utility of these compounds are demonstrated. The molecular docking of compound 5 with an Alzheimer's disease (AD) associated AChE target site was studied.
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Affiliation(s)
- Sakthivel Pandaram
- Bharathidasan University, School of Chemistry, Tiruchirappalli, Tamil Nadu, India.
| | - Adarsh Krishna T P
- Bharathidasan University, School of Chemistry, Tiruchirappalli, Tamil Nadu, India.
| | - Andivelu Ilangovan
- Bharathidasan University, School of Chemistry, Tiruchirappalli, Tamil Nadu, India.
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Adarsh Krishna TP, Pandaram S, Chinnasamy S, Ilangovan A. Oxidative radical coupling of hydroquinones and thiols using chromic acid: one-pot synthesis of quinonyl alkyl/aryl thioethers. RSC Adv 2020; 10:19454-19462. [PMID: 35515459 PMCID: PMC9054077 DOI: 10.1039/d0ra01519a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 05/11/2020] [Indexed: 12/21/2022] Open
Abstract
An efficient, simple and practical protocol for one-pot sequential oxidative radical C–H/S–H cross-coupling of thiols with hydroquinones (HQs) and oxidation leading to the formation of quinonyl alkyl/aryl thioethers using H2CrO4 was developed. This cross-coupling of thiyl and aryl radicals offers mono thioethers in good to moderate yield and works well with a wide variety of thiols. Similarly, this method works well for coupling of 2-amino thiophenol and HQs to form phenothiazine-3-ones 5a–c. C–S bond formation via thioether synthesis was observed using a chromium reagent for the first time. Theoretical studies on the pharmacokinetic properties of compounds 5a–c revealed that due to drug-like properties, compound 5b strongly binds with Alzheimer's disease (AD) associated AChE target sites. Oxidative radical C–H/S–H cross coupling of hydroquinones and thiols and oxidation to quinone using a H2CrO4 system was developed.![]()
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Affiliation(s)
- Yijun Wang
- School of Basic Medical Sciences; Zhengzhou University; Science Avenue 100 Zhengzhou 450001 P. R. China
| | - Shuai Zhu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology; Ministry of Education, School of Pharmaceutical Sciences; Jiangnan University; Lihu Avenue 1800 Wuxi 214122 P. R. China
| | - Liang-Hua Zou
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology; Ministry of Education, School of Pharmaceutical Sciences; Jiangnan University; Lihu Avenue 1800 Wuxi 214122 P. R. China
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Sie CY, Chuang CP. Electrophilic carbocyclization reactions of 2-(2-alkynylphenyl)amino-1,4-naphthoquinones. Org Biomol Chem 2018; 16:5483-5491. [DOI: 10.1039/c8ob01170b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrophilic carbocylization reactions for the synthesis of 5H-benzo[b]naphtho [2,3-f]azepine-6,11-diones are described.
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Affiliation(s)
- Chang-You Sie
- Department of Chemistry
- National Cheng Kung University
- Tainan
- Taiwan
| | - Che-Ping Chuang
- Department of Chemistry
- National Cheng Kung University
- Tainan
- Taiwan
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