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Angulo-Elizari E, Henriquez-Figuereo A, Morán-Serradilla C, Plano D, Sanmartín C. Unlocking the potential of 1,4-naphthoquinones: A comprehensive review of their anticancer properties. Eur J Med Chem 2024; 268:116249. [PMID: 38458106 DOI: 10.1016/j.ejmech.2024.116249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/14/2024] [Accepted: 02/15/2024] [Indexed: 03/10/2024]
Abstract
Cancer encompasses a group of pathologies with common characteristics, high incidence, and prevalence in all countries. Although there are treatments available for this disease, they are not always effective or safe, often failing to achieve the desired results. This is why it is necessary to continue the search for new therapies. One of the strategies for obtaining new antitumor drugs is the use of 1,4-naphthoquinone as a scaffold in synthetic or natural products with antitumor activity. This review focuses on compiling studies related to the antitumor activity of 1,4-naphthoquinone and its natural and synthetic derivatives over the last 10 years. The work describes the main natural naphthoquinones with antitumor activity and classifies the synthetic naphthoquinones based on the structural modifications made to the scaffold. Additionally, the formation of metal complexes using naphthoquinones as a ligand is considered. After a thorough review, 197 synthetic compounds with potent biological activity against cancer have been classified according to their chemical structures and their mechanisms of action have been described.
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Affiliation(s)
- Eduardo Angulo-Elizari
- University of Navarra, School of Pharmacy and Nutrition, Department of Pharmaceutical Sciences, Irunlarrea 1, 31008, Pamplona, Spain
| | - Andreina Henriquez-Figuereo
- University of Navarra, School of Pharmacy and Nutrition, Department of Pharmaceutical Sciences, Irunlarrea 1, 31008, Pamplona, Spain
| | - Cristina Morán-Serradilla
- University of Navarra, School of Pharmacy and Nutrition, Department of Pharmaceutical Sciences, Irunlarrea 1, 31008, Pamplona, Spain
| | - Daniel Plano
- University of Navarra, School of Pharmacy and Nutrition, Department of Pharmaceutical Sciences, Irunlarrea 1, 31008, Pamplona, Spain; Navarra Institute for Health Research (IdisNA), 31008, Pamplona, Spain.
| | - Carmen Sanmartín
- University of Navarra, School of Pharmacy and Nutrition, Department of Pharmaceutical Sciences, Irunlarrea 1, 31008, Pamplona, Spain; Navarra Institute for Health Research (IdisNA), 31008, Pamplona, Spain.
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Islam MR, Rahman MM, Dhar PS, Nowrin FT, Sultana N, Akter M, Rauf A, Khalil AA, Gianoncelli A, Ribaudo G. The Role of Natural and Semi-Synthetic Compounds in Ovarian Cancer: Updates on Mechanisms of Action, Current Trends and Perspectives. Molecules 2023; 28:2070. [PMID: 36903316 PMCID: PMC10004182 DOI: 10.3390/molecules28052070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/16/2023] [Accepted: 02/21/2023] [Indexed: 02/25/2023] Open
Abstract
Ovarian cancer represents a major health concern for the female population: there is no obvious cause, it is frequently misdiagnosed, and it is characterized by a poor prognosis. Additionally, patients are inclined to recurrences because of metastasis and poor treatment tolerance. Combining innovative therapeutic techniques with established approaches can aid in improving treatment outcomes. Because of their multi-target actions, long application history, and widespread availability, natural compounds have particular advantages in this connection. Thus, effective therapeutic alternatives with improved patient tolerance hopefully can be identified within the world of natural and nature-derived products. Moreover, natural compounds are generally perceived to have more limited adverse effects on healthy cells or tissues, suggesting their potential role as valid treatment alternatives. In general, the anticancer mechanisms of such molecules are connected to the reduction of cell proliferation and metastasis, autophagy stimulation and improved response to chemotherapeutics. This review aims at discussing the mechanistic insights and possible targets of natural compounds against ovarian cancer, from the perspective of medicinal chemists. In addition, an overview of the pharmacology of natural products studied to date for their potential application towards ovarian cancer models is presented. The chemical aspects as well as available bioactivity data are discussed and commented on, with particular attention to the underlying molecular mechanism(s).
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Affiliation(s)
- Md. Rezaul Islam
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Md. Mominur Rahman
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Puja Sutro Dhar
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Feana Tasmim Nowrin
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Nasrin Sultana
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Muniya Akter
- Department of Pharmacy, Faculty of Allied Health Sciences, Daffodil International University, Dhaka 1207, Bangladesh
| | - Abdur Rauf
- Department of Chemistry, University of Swabi, Anbar 23430, Pakistan
| | - Anees Ahmed Khalil
- University Institute of Diet and Nutritional Sciences, Faculty of Allied Health Sciences, The University of Lahore, Lahore 54000, Pakistan
| | - Alessandra Gianoncelli
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, Viale Europa 11, 25123 Brescia, Italy
| | - Giovanni Ribaudo
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, Viale Europa 11, 25123 Brescia, Italy
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Zhu L, Ma S, Li K, Xiong P, Qin S, Cai W. Systematic Screening of Chemical Constituents in the Traditional Chinese Medicine Arnebiae Radix by UHPLC-Q-Exactive Orbitrap Mass Spectrometry. Molecules 2022; 27:2631. [PMID: 35565981 PMCID: PMC9104353 DOI: 10.3390/molecules27092631] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 04/18/2022] [Accepted: 04/18/2022] [Indexed: 12/31/2022] Open
Abstract
Arnebiae Radix (dried root of Arnebia euchroma (Royle) Johnst.) has been used in traditional Chinese medicine (TCM) to treat macular eruptions, measles, sore throat, carbuncles, burns, skin ulcers, and inflammation. Previous studies have shown that shikonins and shikonofurans are two of their main bioactive ingredients. However, systematic investigations of their constituents have rarely been conducted. It is necessary to establish a rapid and effective method to identify the chemical constituents of Arnebiae Radix. This will help to further improve the effective resource utilization rate of this plant. In this study, a rapid and effective UHPLC-Q-Exactive Orbitrap mass spectrometry method was established to simultaneously analyze chemical ingredients in Arnebiae Radix within a short period of time. Based on the results of a full scan MS, the MS2 database (mzVault and mzCloud), the diagnostic fragment ions, the retention time, and the bibliography, a total of 188 compounds were identified, with 114 of those being reported from Arnebiae Radix for the first time. The results of this study lay the foundation for obtaining a thorough understanding of the active ingredients in Arnebiae Radix and its quality control. This method may be widely used for the chemical characterization of different samples.
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Affiliation(s)
- Lian Zhu
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, China; (L.Z.); (S.M.)
- Sino-Pakistan Center on Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China; (K.L.); (P.X.); (S.Q.)
| | - Shengjun Ma
- College of Food Science and Pharmacy, Xinjiang Agricultural University, Urumqi 830052, China; (L.Z.); (S.M.)
| | - Kailin Li
- Sino-Pakistan Center on Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China; (K.L.); (P.X.); (S.Q.)
| | - Pei Xiong
- Sino-Pakistan Center on Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China; (K.L.); (P.X.); (S.Q.)
| | - Shihan Qin
- Sino-Pakistan Center on Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China; (K.L.); (P.X.); (S.Q.)
| | - Wei Cai
- Sino-Pakistan Center on Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China; (K.L.); (P.X.); (S.Q.)
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Zhu L, Li K, Liu M, Liu K, Ma S, Cai W. Anti-cancer Research on Arnebiae Radix-derived Naphthoquinone in Recent Five Years. Recent Pat Anticancer Drug Discov 2021; 17:218-230. [PMID: 34886780 DOI: 10.2174/1574892816666211209164745] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 09/13/2021] [Accepted: 09/21/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND In recent years, many naphthoquinone compounds with anticancer activity have been identified in Arnebiae Radix, and some of them have the potential to be developed into anticancer drugs. OBJECTIVE This article aimed to provide a comprehensive overview of the anticancer effects of naphthoquinone compounds through a detailed review of literature and Chinese patents, and discuss their potential to be developed as anticancer drugs for clinical application. METHODS Research papers were collected through the databases of PubMed, Cnki and SciDirect using keyword searches "naphthoquinone compounds" and "anticancer". The keywords of "shikonin" and "shikonin derivatives" were also used in PubMed, Cnki and SciDirect databases to collect research articles. The Chinese patents were collected using the Cnki patent database. RESULTS Naphthoquinone compounds have been found to possess anti-cancer activity, and their modes of action are associated with inducing apoptosis, inhibiting cancer cell proliferation, promoting autophagy in cancer cells, anti-cancer angiogenesis and inhibition of cell adhesion, invasion and metastasis, inhibiting glycolysis and inhibiting DNA topoisomerase activity. CONCLUSION Most of the naphthoquinone compounds show effective anti-cancer activity in vitro. The structure modification of naphthoquinone aims to develop anti-cancer drugs with high efficacy and low toxicity.
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Affiliation(s)
- Lian Zhu
- School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 41800. China
| | - Kailin Li
- School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 41800. China
| | - Mingjuan Liu
- School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 41800. China
| | - Kexin Liu
- School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 41800. China
| | - Shengjun Ma
- School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 41800. China
| | - Wei Cai
- School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 41800. China
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Pérez-Pertejo Y, Escudero-Martínez JM, Reguera RM, Balaña-Fouce R, García PA, Jambrina PG, San Feliciano A, Castro MÁ. Antileishmanial activity of terpenylquinones on Leishmania infantum and their effects on Leishmania topoisomerase IB. INTERNATIONAL JOURNAL FOR PARASITOLOGY-DRUGS AND DRUG RESISTANCE 2019; 11:70-79. [PMID: 31678841 PMCID: PMC6904838 DOI: 10.1016/j.ijpddr.2019.10.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/01/2019] [Accepted: 10/22/2019] [Indexed: 10/31/2022]
Abstract
Leishmania is the aethiological agent responsible for the visceral leishmaniasis, a serious parasite-borne disease widely spread all over the World. The emergence of resistant strains makes classical treatments less effective; therefore, new and better drugs are necessary. Naphthoquinones are interesting compounds for which many pharmacological properties have been described, including leishmanicidal activity. This work shows the antileishmanial effect of two series of terpenyl-1,4-naphthoquinones (NQ) and 1,4-anthraquinones (AQ) obtained from natural terpenoids, such as myrcene and myrceocommunic acid. They were evaluated both in vitro and ex vivo against the transgenic iRFP-Leishmania infantum strain and also tested on liver HepG2 cells to determine their selectivity indexes. The results indicated that NQ derivatives showed better antileishmanial activity than AQ analogues, and among them, compounds with a diacetylated hydroquinone moiety provided better results than their corresponding quinones. Regarding the terpenic precursor, compounds obtained from the monoterpenoid myrcene displayed good antiparasitic efficiency and low cytotoxicity for mammalian cells, whereas those derived from the diterpenoid showed better antileishmanial activity without selectivity. In order to explore their mechanism of action, all the compounds have been tested as potential inhibitors of Leishmania type IB DNA topoisomerases, but only some compounds that displayed the quinone ring were able to inhibit the recombinant enzyme in vitro. This fact together with the docking studies performed on LTopIB suggested the existence of another mechanism of action, alternative or complementary to LTopIB inhibition. In silico druglikeness and ADME evaluation of the best leishmanicidal compounds has shown good predictable druggability.
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Affiliation(s)
- Yolanda Pérez-Pertejo
- Departamento de Ciencias Biomédicas. Campus de Vegazana, University of León, León, Spain
| | | | - Rosa M Reguera
- Departamento de Ciencias Biomédicas. Campus de Vegazana, University of León, León, Spain
| | - Rafael Balaña-Fouce
- Departamento de Ciencias Biomédicas. Campus de Vegazana, University of León, León, Spain
| | - Pablo A García
- Departamento de Ciencias Farmacéuticas, Área de Química Farmacéutica, Facultad de Farmacia, CIETUS, IBSAL, Campus Miguel de Unamuno, University of Salamanca, Salamanca, Spain
| | - Pablo G Jambrina
- Departamento de Química Física. Facultad de Ciencias Químicas, University of Salamanca, Salamanca, Spain
| | - Arturo San Feliciano
- Departamento de Ciencias Farmacéuticas, Área de Química Farmacéutica, Facultad de Farmacia, CIETUS, IBSAL, Campus Miguel de Unamuno, University of Salamanca, Salamanca, Spain
| | - María-Ángeles Castro
- Departamento de Ciencias Farmacéuticas, Área de Química Farmacéutica, Facultad de Farmacia, CIETUS, IBSAL, Campus Miguel de Unamuno, University of Salamanca, Salamanca, Spain.
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Analysis of the Mechanisms of Action of Naphthoquinone-Based Anti-Acute Myeloid Leukemia Chemotherapeutics. Molecules 2019; 24:molecules24173121. [PMID: 31466259 PMCID: PMC6749238 DOI: 10.3390/molecules24173121] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 08/24/2019] [Accepted: 08/25/2019] [Indexed: 01/02/2023] Open
Abstract
Acute myeloid leukemia (AML) is a neoplastic disorder resulting from clonal proliferation of poorly differentiated immature myeloid cells. Distinct genetic and epigenetic aberrations are key features of AML that account for its variable response to standard therapy. Irrespective of their oncogenic mutations, AML cells produce elevated levels of reactive oxygen species (ROS). They also alter expression and activity of antioxidant enzymes to promote cell proliferation and survival. Subsequently, selective targeting of redox homeostasis in a molecularly heterogeneous disease, such as AML, has been an appealing approach in the development of novel anti-leukemic chemotherapeutics. Naphthoquinones are able to undergo redox cycling and generate ROS in cancer cells, which have made them excellent candidates for testing against AML cells. In addition to inducing oxidative imbalance in AML cells, depending on their structure, naphthoquinones negatively affect other cellular apparatus causing neoplastic cell death. Here we provide an overview of the anti-AML activities of naphthoquinone derivatives, as well as analysis of their mechanism of action, including induction of reduction-oxidation imbalance, alteration in mitochondrial transmembrane potential, Bcl-2 modulation, initiation of DNA damage, and modulation of MAPK and STAT3 activity, alterations in the unfolded protein response and translocation of FOX-related transcription factors to the nucleus.
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Shikonin derivatives for cancer prevention and therapy. Cancer Lett 2019; 459:248-267. [PMID: 31132429 DOI: 10.1016/j.canlet.2019.04.033] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/15/2019] [Accepted: 04/26/2019] [Indexed: 12/25/2022]
Abstract
Phytochemicals gained considerable interest during the past years as source to develop new treatment options for chemoprevention and cancer therapy. Motivated by the fact that a majority of established anticancer drugs are derived in one way or another from natural resources, we focused on shikonin, a naphthoquinone with high potentials to be further developed as preventive or therapeutic drug to fight cancer. Shikonin is the major chemical component of Lithospermum erythrorhizon (Purple Cromwell) roots. Traditionally, the root extract has been applied to cure dermatitis, burns, and wounds. Over the past three decades, the anti-inflammatory and anticancer effects of root extracts, isolated shikonin as well as semi-synthetic and synthetic derivatives and nanoformulations have been described. In vitro and in vivo experiments were conducted to understand the effect of shikonin at cellular and molecular levels. Preliminary clinical trials indicate the potential of shikonin for translation into clinical oncology. Shikonin exerts additive and synergistic interactions in combination with established chemotherapeutics, immunotherapeutic approaches, radiotherapy and other treatment modalities, which further underscores the potential of this phytochemical to be integrated into standard treatment regimens.
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Kundu B, Das SK, Paul Chowdhuri S, Pal S, Sarkar D, Ghosh A, Mukherjee A, Bhattacharya D, Das BB, Talukdar A. Discovery and Mechanistic Study of Tailor-Made Quinoline Derivatives as Topoisomerase 1 Poison with Potent Anticancer Activity. J Med Chem 2019; 62:3428-3446. [PMID: 30897325 DOI: 10.1021/acs.jmedchem.8b01938] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
To overcome chemical limitations of camptothecin (CPT), we report design, synthesis, and validation of a quinoline-based novel class of topoisomerase 1 (Top1) inhibitors and establish that compound 28 ( N-(3-(1 H-imidazol-1-yl)propyl)-6-(4-methoxyphenyl)-3-(1,3,4-oxadiazol-2-yl)quinolin-4-amine) exhibits the highest potency in inhibiting human Top1 activity with an IC50 value of 29 ± 0.04 nM. Compound 28 traps Top1-DNA cleavage complexes (Top1ccs) both in the in vitro cleavage assays and in live cells. Point mutation of Top1-N722S fails to trap compound 28-induced Top1cc because of its inability to form a hydrogen bond with compound 28. Unlike CPT, compound 28 shows excellent plasma serum stability and is not a substrate of P-glycoprotein 1 (permeability glycoprotein) advancing its potential anticancer activity. Finally, we provide evidence that compound 28 overcomes the chemical instability of CPT in human breast adenocarcinoma cells through generation of persistent and less reversible Top1cc-induced DNA double-strand breaks as detected by γH2AX foci immunostaining after 5 h of drug removal.
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Affiliation(s)
- Biswajit Kundu
- Department of Organic and Medicinal Chemistry , CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road , Kolkata 700032 , West Bengal , India
| | - Subhendu K Das
- Laboratory of Molecular Biology, School of Biological Sciences ; Indian Association for the Cultivation of Science , 2A & 2B, Raja S. C. Mullick Road , Kolkata , 700032 West Bengal , India
| | - Srijita Paul Chowdhuri
- Laboratory of Molecular Biology, School of Biological Sciences ; Indian Association for the Cultivation of Science , 2A & 2B, Raja S. C. Mullick Road , Kolkata , 700032 West Bengal , India
| | - Sourav Pal
- Department of Organic and Medicinal Chemistry , CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road , Kolkata 700032 , West Bengal , India.,Academy of Scientific and Innovative Research , Kolkata 700032 , West Bengal , India
| | - Dipayan Sarkar
- Department of Organic and Medicinal Chemistry , CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road , Kolkata 700032 , West Bengal , India.,Academy of Scientific and Innovative Research , Kolkata 700032 , West Bengal , India
| | - Arijit Ghosh
- Laboratory of Molecular Biology, School of Biological Sciences ; Indian Association for the Cultivation of Science , 2A & 2B, Raja S. C. Mullick Road , Kolkata , 700032 West Bengal , India
| | - Ayan Mukherjee
- Department of Organic and Medicinal Chemistry , CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road , Kolkata 700032 , West Bengal , India.,Academy of Scientific and Innovative Research , Kolkata 700032 , West Bengal , India
| | - Debomita Bhattacharya
- Department of Organic and Medicinal Chemistry , CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road , Kolkata 700032 , West Bengal , India
| | - Benu Brata Das
- Laboratory of Molecular Biology, School of Biological Sciences ; Indian Association for the Cultivation of Science , 2A & 2B, Raja S. C. Mullick Road , Kolkata , 700032 West Bengal , India
| | - Arindam Talukdar
- Department of Organic and Medicinal Chemistry , CSIR-Indian Institute of Chemical Biology , 4 Raja S. C. Mullick Road , Kolkata 700032 , West Bengal , India
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Kim S, Matsubara R, Hayashi M. Activated Carbon-Promoted Dehydrogenation of Hydroquinones to Benzoquinones, Naphthoquinones, and Anthraquinones under Molecular Oxygen Atmosphere. J Org Chem 2019; 84:2997-3003. [DOI: 10.1021/acs.joc.8b02961] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sanghun Kim
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
| | - Ryosuke Matsubara
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
| | - Masahiko Hayashi
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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Prasad SS, Reddy NR, Baskaran S. One-Pot Synthesis of Structurally Diverse Iminosugar-Based Hybrid Molecules. J Org Chem 2018; 83:9604-9618. [DOI: 10.1021/acs.joc.8b00748] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sure Siva Prasad
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | | | - Sundarababu Baskaran
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
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