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Tangdenpaisal K, Kheakwanwong W, Ruchirawat S, Ploypradith P. Dihydro-10 H-indeno[1,2- b]benzofurans and Tetrahydroindeno[1,2- c]isochromenes via Stereoselective Intramolecular Carbocation Cascade Cyclization. J Org Chem 2024; 89:2964-2983. [PMID: 38345392 DOI: 10.1021/acs.joc.3c02380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Nazarov cyclization of the (E)-(2-stilbenyl)methanols under the catalysis of p-TsOH immobilized on silica (PTS-Si) proceeded to give the corresponding indanyl cation with the exclusive trans relationship at the two newly formed adjacent stereogenic centers. The ensuing intramolecular nucleophilic addition by the MOM-protected phenol (m = 0) or benzyl alcohol (m = 1) furnished the Indane-fused benzofuran [5/5] or isochroman [5/6] system, respectively, with the exclusive cis stereocontrol at the two-carbon ring junction. Thus, in a single step, from nonchiral starting materials, the intramolecular cascade carbocation cyclization (CCC) furnished the [5/5] or [5/6] oxygen-containing Indane fused-ring systems in moderate to good yields with excellent stereoselectivity on all three contiguous stereogenic centers.
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Affiliation(s)
- Kassrin Tangdenpaisal
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok, Thailand 10210
| | - Wichita Kheakwanwong
- Program in Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok, Thailand 10210
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok, Thailand 10210
- Program in Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok, Thailand 10210
- Center of Excellence on Environmental Health and Toxicology, Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI), Bangkok, Thailand 10400
| | - Poonsakdi Ploypradith
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok, Thailand 10210
- Program in Chemical Sciences, Chulabhorn Graduate Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok, Thailand 10210
- Center of Excellence on Environmental Health and Toxicology, Office of the Permanent Secretary (OPS), Ministry of Higher Education, Science, Research and Innovation (MHESI), Bangkok, Thailand 10400
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2
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Sankara CS, Namboothiri INN. Hauser-Kraus Annulation Initiated Multi-Cascade Reactions for Facile Access to Functionalized and Fused Oxazepines, Carbazoles and Phenanthridinediones. Chemistry 2024; 30:e202303517. [PMID: 37946675 DOI: 10.1002/chem.202303517] [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: 11/01/2023] [Revised: 11/07/2023] [Accepted: 11/09/2023] [Indexed: 11/12/2023]
Abstract
The Hauser-Kraus (H-K) annulation of N-unsubstituted 3-olefinic oxindoles with 3-nucleophilic phthalides triggers a cascade of ring expansion and ring contraction reactions through several regioselective steps in one pot. While oxazepines were isolated in the presence of stoichiometric amounts of base at room temperature, carbazoles and phenanthridinediones were the products in the presence of excess base and microwave irradiation. Mechanistic studies guided by stepwise reactions and control experiments revealed that the isolable oxazepine intermediate, formed via ring expansion of the H-K adduct, is the key precursor to carbazole and phenanthridinedione via decarboxylative regioselective cyclizations.
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3
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Santos LH, Kronenberger T, Almeida RG, Silva EB, Rocha REO, Oliveira JC, Barreto LV, Skinner D, Fajtová P, Giardini MA, Woodworth B, Bardine C, Lourenço AL, Craik CS, Poso A, Podust LM, McKerrow JH, Siqueira-Neto JL, O’Donoghue AJ, da Silva
Júnior EN, Ferreira RS. Structure-Based Identification of Naphthoquinones and Derivatives as Novel Inhibitors of Main Protease M pro and Papain-like Protease PL pro of SARS-CoV-2. J Chem Inf Model 2022; 62:6553-6573. [PMID: 35960688 PMCID: PMC9397563 DOI: 10.1021/acs.jcim.2c00693] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Indexed: 01/07/2023]
Abstract
The worldwide COVID-19 pandemic caused by the coronavirus SARS-CoV-2 urgently demands novel direct antiviral treatments. The main protease (Mpro) and papain-like protease (PLpro) are attractive drug targets among coronaviruses due to their essential role in processing the polyproteins translated from the viral RNA. In this study, we virtually screened 688 naphthoquinoidal compounds and derivatives against Mpro of SARS-CoV-2. Twenty-four derivatives were selected and evaluated in biochemical assays against Mpro using a novel fluorogenic substrate. In parallel, these compounds were also assayed with SARS-CoV-2 PLpro. Four compounds inhibited Mpro with half-maximal inhibitory concentration (IC50) values between 0.41 μM and 9.0 μM. In addition, three compounds inhibited PLpro with IC50 ranging from 1.9 μM to 3.3 μM. To verify the specificity of Mpro and PLpro inhibitors, our experiments included an assessment of common causes of false positives such as aggregation, high compound fluorescence, and inhibition by enzyme oxidation. Altogether, we confirmed novel classes of specific Mpro and PLpro inhibitors. Molecular dynamics simulations suggest stable binding modes for Mpro inhibitors with frequent interactions with residues in the S1 and S2 pockets of the active site. For two PLpro inhibitors, interactions occur in the S3 and S4 pockets. In summary, our structure-based computational and biochemical approach identified novel naphthoquinonal scaffolds that can be further explored as SARS-CoV-2 antivirals.
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Affiliation(s)
- Lucianna H. Santos
- Department of Biochemistry and Immunology,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
| | - Thales Kronenberger
- Department of Oncology and Pneumonology, Internal
Medicine VIII, University Hospital Tübingen,
Otfried-Müller-Straße 10, DE72076 Tübingen,
Germany
- School of Pharmacy, Faculty of Health Sciences,
University of Eastern Finland, 70211 Kuopio,
Finland
- Institute of Pharmacy, Pharmaceutical/Medicinal
Chemistry and Tübingen Center for Academic Drug Discovery (TüCAD2),
Eberhard Karls University Tübingen, Auf der
Morgenstelle 8, 72076 Tübingen, Germany
| | - Renata G. Almeida
- Institute of Exact Sciences, Department of Chemistry,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
| | - Elany B. Silva
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - Rafael E. O. Rocha
- Department of Biochemistry and Immunology,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
| | - Joyce C. Oliveira
- Institute of Exact Sciences, Department of Chemistry,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
| | - Luiza V. Barreto
- Department of Biochemistry and Immunology,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
| | - Danielle Skinner
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - Pavla Fajtová
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
- Institute of Organic Chemistry and Biochemistry,
Academy of Sciences of the Czech Republic, 16610 Prague,
Czech Republic
| | - Miriam A. Giardini
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - Brendon Woodworth
- Department of Medicine, Division of Infectious
Diseases, University of California San Diego, La Jolla,
California 92093, United States
| | - Conner Bardine
- Department of Pharmaceutical Chemistry,
University of California San Francisco, San Francisco,
California 94143, United States
| | - André L. Lourenço
- Department of Pharmaceutical Chemistry,
University of California San Francisco, San Francisco,
California 94143, United States
| | - Charles S. Craik
- Department of Pharmaceutical Chemistry,
University of California San Francisco, San Francisco,
California 94143, United States
| | - Antti Poso
- Department of Oncology and Pneumonology, Internal
Medicine VIII, University Hospital Tübingen,
Otfried-Müller-Straße 10, DE72076 Tübingen,
Germany
- School of Pharmacy, Faculty of Health Sciences,
University of Eastern Finland, 70211 Kuopio,
Finland
| | - Larissa M. Podust
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - James H. McKerrow
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - Jair L. Siqueira-Neto
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - Anthony J. O’Donoghue
- Skaggs School of Pharmacy and Pharmaceutical Sciences,
University of California San Diego, 9500 Gilman Drive, La
Jolla, California 92093-0657, United States
| | - Eufrânio N. da Silva
Júnior
- Institute of Exact Sciences, Department of Chemistry,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
| | - Rafaela S. Ferreira
- Department of Biochemistry and Immunology,
Federal University of Minas Gerais, Belo Horizonte, Minas
Gerais 31270-901, Brazil
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4
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Basu P, Satam N, Pati S, Suresh A, Namboothiri INN. Reactions of Sulfonylphthalide with Diverse Activated Imines for the Synthesis of Enaminophthalides, Spiro-isoquinolinones, and Homalicine Natural Products. J Org Chem 2022; 88:4038-4051. [PMID: 35797456 DOI: 10.1021/acs.joc.2c00816] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactivity of the Hauser-Kraus (H-K) donor, 3-sulfonylphthalide, with various activated imines under basic conditions is demonstrated. The reaction of 3-sulfonylphthalide with Boc-protected aldimine provides a rapid access to 1,2-imine adducts and alkylidenephthalides depending upon the stoichiometry of the base. The alkylidenephthalides could be transformed to ketophthalides, a new class of phthalides, on acid hydrolysis, which upon reductive cyclization using Zn/AcOH afforded the natural product homalicine. On the contrary, the Boc-protected isatinimines undergo an efficient H-K annulation to provide spiro-isoquinolinone-oxindoles in excellent yields. However, the corresponding conjugated ketimines afforded Michael adducts, which were converted to the corresponding alkylidenephthalides under TBAF conditions.
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Affiliation(s)
- Pallabita Basu
- Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
| | - Nishikant Satam
- Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
| | - Soumyaranjan Pati
- Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
| | - Alati Suresh
- Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
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5
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Santos LH, Kronenberger T, Almeida RG, Silva EB, Rocha REO, Oliveira JC, Barreto LV, Skinner D, Fajtová P, Giardini MA, Woodworth B, Bardine C, Lourenço AL, Craik CS, Poso A, Podust LM, McKerrow JH, Siqueira-Neto JL, O'Donoghue AJ, da Silva Júnior EN, Ferreira RS. Structure-based identification of naphthoquinones and derivatives as novel inhibitors of main protease Mpro and papain-like protease PLpro of SARS-CoV-2. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2022:2022.01.05.475095. [PMID: 35018373 PMCID: PMC8750648 DOI: 10.1101/2022.01.05.475095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The worldwide COVID-19 pandemic caused by the coronavirus SARS-CoV-2 urgently demands novel direct antiviral treatments. The main protease (Mpro) and papain-like protease (PLpro) are attractive drug targets among coronaviruses due to their essential role in processing the polyproteins translated from the viral RNA. In the present work, we virtually screened 688 naphthoquinoidal compounds and derivatives against Mpro of SARS-CoV-2. Twenty-four derivatives were selected and evaluated in biochemical assays against Mpro using a novel fluorogenic substrate. In parallel, these compounds were also assayed with SARS-CoV-2 PLpro. Four compounds inhibited Mpro with half-maximal inhibitory concentration (IC 50 ) values between 0.41 µM and 66 µM. In addition, eight compounds inhibited PLpro with IC 50 ranging from 1.7 µM to 46 µM. Molecular dynamics simulations suggest stable binding modes for Mpro inhibitors with frequent interactions with residues in the S1 and S2 pockets of the active site. For two PLpro inhibitors, interactions occur in the S3 and S4 pockets. In summary, our structure-based computational and biochemical approach identified novel naphthoquinonal scaffolds that can be further explored as SARS-CoV-2 antivirals.
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6
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Satam N, Basu P, Pati S, Namboothiri INN. Michael Addition‐Elimination and [4+1] Annulation of Sulfonylphthalide with Hydroxychalcones for the Synthesis of Alkylidenephthalides and Indanediones. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Nishikant Satam
- Department of Chemistry Indian Institute of Technology Bombay Mumbai 400076 India
| | - Pallabita Basu
- Department of Chemistry Indian Institute of Technology Bombay Mumbai 400076 India
| | - Soumyaranjan Pati
- Department of Chemistry Indian Institute of Technology Bombay Mumbai 400076 India
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7
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Satham L, Suresh A, Namboothiri INN. Synthesis of Sulfonyloxindoles via Functional Group Exchange Between 3‐Sulfonylphthalide and Isatylidenemalononitrile. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100148] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
| | - Alati Suresh
- Department of Chemistry Indian Institute of Technology Bombay Mumbai 400 076 India
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8
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Kalt MM, Schuehly W, Saf R, Ochensberger S, Solnier J, Bucar F, Kaiser M, Presser A. Palladium-catalysed synthesis of arylnaphthoquinones as antiprotozoal and antimycobacterial agents. Eur J Med Chem 2020; 207:112837. [PMID: 33002847 DOI: 10.1016/j.ejmech.2020.112837] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 08/26/2020] [Accepted: 09/07/2020] [Indexed: 10/23/2022]
Abstract
Malaria and tuberculosis are still among the leading causes of death in low-income countries. The 1,4-naphthoquinone (NQ) scaffold can be found in a variety of anti-infective agents. Herein, we report an optimised, high yield process for the preparation of various 2-arylnaphthoquinones by a palladium-catalysed Suzuki reaction. All synthesised compounds were evaluated for their in-vitro antiprotozoal and antimycobacterial activity. Antiprotozoal activity was assessed against Plasmodium falciparum (P.f.) NF54 and Trypanosoma brucei rhodesiense (T.b.r.) STIB900, and antimycobacterial activity against Mycobacterium smegmatis (M.s.) mc2 155. Substitution with pyridine and pyrimidine rings significantly increased antiplasmodial potency of our compounds. The 2-aryl-NQs exhibited trypanocidal activity in the nM range with a very favourable selectivity profile. (Pseudo)halogenated aryl-NQs were found to have a pronounced effect indicating inhibition of mycobacterial efflux pumps. Cytotoxicity of all compounds towards L6 cells was evaluated and the respective selectivity indices (SI) were calculated. In addition, the physicochemical parameters of the synthesised compounds were discussed.
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Affiliation(s)
- Marc-Manuel Kalt
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstrasse 1, A-8010, Graz, Austria
| | - Wolfgang Schuehly
- Institute of Pharmaceutical Sciences, Pharmacognosy, University of Graz, Universitaetsplatz 4, A-8010, Graz, Austria
| | - Robert Saf
- Institute for Chemistry and Technology of Materials (ICTM), University of Technology, Stremayrgasse 9, A-8010, Graz, Austria
| | - Sandra Ochensberger
- Institute of Pharmaceutical Sciences, Pharmacognosy, University of Graz, Universitaetsplatz 4, A-8010, Graz, Austria
| | - Julia Solnier
- Institute of Pharmaceutical Sciences, Pharmacognosy, University of Graz, Universitaetsplatz 4, A-8010, Graz, Austria
| | - Franz Bucar
- Institute of Pharmaceutical Sciences, Pharmacognosy, University of Graz, Universitaetsplatz 4, A-8010, Graz, Austria
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, Socinstrasse 57, CH-4002, Basel, Switzerland; University of Basel, Petersplatz 1, CH-4003, Basel, Switzerland
| | - Armin Presser
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstrasse 1, A-8010, Graz, Austria.
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9
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Wood JM, Satam NS, Almeida RG, Cristani VS, de Lima DP, Dantas-Pereira L, Salomão K, Menna-Barreto RF, Namboothiri IN, Bower JF, da Silva Júnior EN. Strategies towards potent trypanocidal drugs: Application of Rh-catalyzed [2 + 2 + 2] cycloadditions, sulfonyl phthalide annulation and nitroalkene reactions for the synthesis of substituted quinones and their evaluation against Trypanosoma cruzi. Bioorg Med Chem 2020; 28:115565. [DOI: 10.1016/j.bmc.2020.115565] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/21/2020] [Accepted: 05/22/2020] [Indexed: 02/08/2023]
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10
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Kraus GA, Wang S. Annulations with Butenolides and Phthalides: New Entries to Isocoumarins, 3,4-Dihydroisocoumarins, and Benzofurans. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The reactions of the anions of butenolides and substituted phthalides with sorbate esters and mono-epoxy sorbate esters furnish isocoumarins, 3,4-dihydroisocoumarins, and benzofurans. The yields range from 41% to 71%.
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11
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Basu P, Satam N, Namboothiri INN. Synthesis of indenofurans, benzofurans and spiro-lactones via Hauser–Kraus annulation involving 1,6-addition of phthalide to quinone methides. Org Biomol Chem 2020; 18:5677-5687. [DOI: 10.1039/d0ob01115k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Base mediated 1,6-addition–Dieckmann cyclization of phthalide with quinone methide leads to oxygen heterocycles such as indenofurans, spiro-lactones and benzofurans through a cascade of rearrangements involving multiple ring opening and ring closure.
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Affiliation(s)
- Pallabita Basu
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Nishikant Satam
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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12
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Suresh A, Baiju TV, Kumar T, Namboothiri INN. Synthesis of Spiro- and Fused Heterocycles via (4+4) Annulation of Sulfonylphthalide with o-Hydroxystyrenyl Derivatives. J Org Chem 2019; 84:3158-3168. [PMID: 30776237 DOI: 10.1021/acs.joc.8b03039] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
An expedient one-pot protocol for the synthesis of functionalized benzofuran containing fused and spiro-heterocycles has been accomplished by the modified Hauser-Kraus (HK) annulation of sulfonylphthalide with o-hydroxychalcones and o-hydroxynitrostyrylisoxazoles. The multicascade process involves Michael addition, Dieckmann cyclization, and a series of cyclizations, eliminations, and rearrangements to deliver the fused and spiro-heterocyclic products. An unusual transformation of fused indenofuran to naphthoquinone, the classical HK adduct, unraveled a novel pathway for the synthesis unsymmetrical naphthoquinones.
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Affiliation(s)
- Alati Suresh
- Department of Chemistry , Indian Institute of Technology Bombay , Mumbai , 400076 , India
| | - Thekke V Baiju
- Department of Chemistry , Indian Institute of Technology Bombay , Mumbai , 400076 , India
| | - Tarun Kumar
- Department of Chemistry , Indian Institute of Technology Bombay , Mumbai , 400076 , India
| | - Irishi N N Namboothiri
- Department of Chemistry , Indian Institute of Technology Bombay , Mumbai , 400076 , India
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13
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Thorat SS, Kontham R. Recent advances in the synthesis of oxaspirolactones and their application in the total synthesis of related natural products. Org Biomol Chem 2019; 17:7270-7292. [DOI: 10.1039/c9ob01212e] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Oxaspirolactones are ubiquitous structural motifs found in natural products and synthetic molecules with a diverse biochemical and physicochemical profile, and represent a valuable target in natural product chemistry and medicinal chemistry.
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Affiliation(s)
- Sagar S. Thorat
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Ravindar Kontham
- Organic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
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14
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Ghosh A, Patra A, Mukherjee S, Biju AT. Synthesis of 2-Aryl Naphthoquinones by the Cross-Dehydrogenative Coupling Involving an NHC-Catalyzed endo-Stetter Reaction. J Org Chem 2018; 84:1103-1110. [DOI: 10.1021/acs.joc.8b02931] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arghya Ghosh
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Atanu Patra
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Subrata Mukherjee
- Organic Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune 411008, India
| | - Akkattu T. Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
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15
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Quinonoid compounds via reactions of lawsone and 2-aminonaphthoquinone with α-bromonitroalkenes and nitroallylic acetates: Structural diversity by C-ring modification and cytotoxic evaluation against cancer cells. Eur J Med Chem 2018; 151:686-704. [DOI: 10.1016/j.ejmech.2018.03.079] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 03/27/2018] [Accepted: 03/29/2018] [Indexed: 12/17/2022]
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16
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Sankar E, Raju P, Karunakaran J, Mohanakrishnan AK. Synthetic Utility of Arylmethylsulfones: Annulative π-Extension of Aromatics and Hetero-aromatics Involving Pd(0)-Catalyzed Heck Coupling Reactions. J Org Chem 2017; 82:13583-13593. [DOI: 10.1021/acs.joc.7b01813] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Elumalai Sankar
- Department of Organic Chemistry, School
of Chemistry, University of Madras Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Potharaju Raju
- Department of Organic Chemistry, School
of Chemistry, University of Madras Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Jayachandran Karunakaran
- Department of Organic Chemistry, School
of Chemistry, University of Madras Guindy Campus, Chennai 600 025, Tamil Nadu, India
| | - Arasambattu K. Mohanakrishnan
- Department of Organic Chemistry, School
of Chemistry, University of Madras Guindy Campus, Chennai 600 025, Tamil Nadu, India
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17
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Sivasankara C, Satham L, Namboothiri INN. One-Pot Construction of Functionalized Spiro-dihydronaphthoquinone-oxindoles via Hauser–Kraus Annulation of Sulfonylphthalide with 3-Alkylideneoxindoles. J Org Chem 2017; 82:12939-12944. [DOI: 10.1021/acs.joc.7b02656] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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Lokesh K, Kesavan V. Efficient Synthesis of Highly Functionalized Spirocarbocyclic Oxindoles through Hauser Annulation. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Kanduru Lokesh
- Chemical Biology Laboratory; Department of Biotechnology; Bhupat and Jyoti Mehta School of Biosciences; Indian Institute of Technology Madras; 600036 Chennai India
| | - Venkitasamy Kesavan
- Chemical Biology Laboratory; Department of Biotechnology; Bhupat and Jyoti Mehta School of Biosciences; Indian Institute of Technology Madras; 600036 Chennai India
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19
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Kumar T, Mane V, Namboothiri INN. Synthesis of Aminophenanthrenes and Benzoquinolines via Hauser–Kraus Annulation of Sulfonyl Phthalide with Rauhut–Currier Adducts of Nitroalkenes. Org Lett 2017; 19:4283-4286. [DOI: 10.1021/acs.orglett.7b01924] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tarun Kumar
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India
| | - Vaijinath Mane
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India
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Mal D, Jana S. Transpositive Tandem Annulation of Phthalides with Allene Carboxylates: Regioselective Synthesis of Arylnaphthalene Lignans. J Org Chem 2016; 81:11857-11865. [DOI: 10.1021/acs.joc.6b02313] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dipakranjan Mal
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - Supriti Jana
- Department
of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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21
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Sunke R, Ramarao EVVS, Nallapati SB, Medisetti R, Kulkarni P, Kapavarapu RK, Bankala R, Parsa KVL, Pal M. Copper-Catalyzed Domino Reaction Involving Nitro as an Unexpected Leaving Group: Construction of Dibenzo-Fused Azepinone Ring. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600748] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Rajnikanth Sunke
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
| | | | - Suresh Babu Nallapati
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
| | - Raghavender Medisetti
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
| | - Pushkar Kulkarni
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
| | - Ravi Kumar Kapavarapu
- Doctoral Programme in Experimental Biology and Biomedicine; Center for Neuroscience and Cell Biology; University of Coimbra; 3004-517 Coimbra Portugal
| | - Ramudu Bankala
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
| | - Kishore V. L. Parsa
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
| | - Manojit Pal
- Dr. Reddy's Institute of Life Sciences; University of Hyderabad Campus, Gachibowli; Hyderabad - 500 046 India
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