1
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Mishra P, Panda N. Total Synthesis of AGI‐7 and Sescandelin from Enol Esters. ChemistrySelect 2022. [DOI: 10.1002/slct.202201791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Priyadarshini Mishra
- Department of Chemistry National Institute of Technology, Rourkela Odisha India- 769008
| | - Niranjan Panda
- Department of Chemistry National Institute of Technology, Rourkela Odisha India- 769008
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2
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Zamarija I, Marsh BJ, Magauer T. Ring Expansion of 1-Indanones to 2-Halo-1-naphthols as an Entry Point to Gilvocarcin Natural Products. Org Lett 2021; 23:9221-9226. [PMID: 34780199 PMCID: PMC7612072 DOI: 10.1021/acs.orglett.1c03530] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Indexed: 11/29/2022]
Abstract
Herein, we describe a two-step ring expansion of 1-indanones to afford 2-chloro/bromo-1-naphthols (32 examples). The developed method shows broad functional group tolerance, benefits from mild reaction conditions, and enables rapid access to the tetracyclic core of gilvocarcin natural products. The orthogonally functionalized products allow for selective postmodifications as exemplified in the total synthesis of defucogilvocarcin M. For the selective oxidation of the chromene, a mild and regioselective oxidation protocol (DDQ and TBHP) was developed.
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Affiliation(s)
- Ivica Zamarija
- Institute of Organic Chemistry and Center for
Molecular Biosciences, Leopold-Franzens-University Innsbruck,
Innrain 80-82, 6020 Innsbruck, Austria
| | - Benjamin J. Marsh
- Department of Chemistry and Pharmacy,
Ludwig-Maximilians-University Munich, Butenandtstrasse 5-13,
81377 Munich, Germany
| | - Thomas Magauer
- Institute of Organic Chemistry and Center for
Molecular Biosciences, Leopold-Franzens-University Innsbruck,
Innrain 80-82, 6020 Innsbruck, Austria
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3
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Zong Y, Ma Q, Tsui GC. Nucleophilic Vinylic Substitution (S NV) of Trisubstituted Monofluoroalkenes for the Synthesis of Stereodefined Trisubstituted Alkenes and Divinyl Ethers. Org Lett 2021; 23:6169-6173. [PMID: 34313444 DOI: 10.1021/acs.orglett.1c02359] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We herein describe a nucleophilic vinylic substitution (SNV) of trisubstituted monofluoroalkenes with excellent stereocontrol (d.r. > 99:1). Starting from (E)-β-monofluoroacrylates, various trisubstituted (E)-alkenes containing O/N/S-substituent groups at the vinylic position can be obtained under simple conditions. Furthermore, (E,E)-divinyl ethers can be generated through dimerization of the monofluoroalkenes, triggered by adventitious water in the reaction mixture.
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Affiliation(s)
| | | | - Gavin Chit Tsui
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China
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4
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Mishra P, Sepay N, Panda N. Access to chromone-3-carboxylic acid via silver mediated coupling of 4-hydroxy coumarin and enol ester. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Kumar A, Prabhu KR. Rhodium(III)-Catalyzed C-H Activation: A Cascade Approach for the Regioselective Synthesis of Fused Heterocyclic Lactone Scaffolds. J Org Chem 2020; 85:3548-3559. [PMID: 31994394 DOI: 10.1021/acs.joc.9b03266] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A Rh(III)-catalyzed cascade C-H activation; regioselective [4 + 2] oxidative annulation; and lactonization of aromatic acids, anhydrides, and acrylic acid derivatives with 4-hydroxy-2-alkynoates have been disclosed. This strategy leads to fused heterocyclic lactone scaffolds in a single step with moderate functional group tolerance and excellent site selectivity. Besides, in one step, an antipode of the cephalosol intermediate natural product that contains a tricyclic isocoumarin framework has been synthesized.
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Affiliation(s)
- Anil Kumar
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, Karnataka, India
| | - Kandikere Ramaiah Prabhu
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, Karnataka, India
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6
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Sunke R, Kalyani A, Swamy KCK. Cu(I)-Catalyzed Ligand-Free Tandem One-Pot or Sequential Annulation via Knoevenagel Intermediates: An Entry into Multifunctional Naphthalenes, Phenanthrenes, Quinolines, and Benzo[ b]carbazoles. J Org Chem 2020; 85:1073-1086. [PMID: 31823603 DOI: 10.1021/acs.joc.9b02991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A simple but efficient one-pot or sequential copper-catalyzed protocol using 2-bromoaldehydes and active methylene group containing substrates that affords multifunctional naphthalenes, phenanthrenes, quinolines, and benzo[b]carbazoles via Knoevenagel condensation, C-arylation, and decarboxylation, followed by aromatization, is developed. The reaction utilizes the potential of Knoevenagel intermediates and does not require any ancillary ligand. The phenanthrene products thus obtained show moderate fluorescence activity. Structural elaboration of the products to obtain dihydrobenzoquinazolines is also highlighted.
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Affiliation(s)
- Rajnikanth Sunke
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , Telangana , India
| | - Adula Kalyani
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , Telangana , India
| | - K C Kumara Swamy
- School of Chemistry , University of Hyderabad , Hyderabad 500046 , Telangana , India
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7
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Ojha S, Panda N. Palladium‐Catalyzed
ortho
‐Benzoylation of Sulfonamides through C−H Activation: Expedient Synthesis of Cyclic
N
‐Sulfonyl Ketimines. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900989] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Subhadra Ojha
- Department of Chemistry National Institute of Technology Rourkela Odisha 769008 India
| | - Niranjan Panda
- Department of Chemistry National Institute of Technology Rourkela Odisha 769008 India
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8
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Gold(I) Complexes with Ferrocenylphosphino Sulfonate Ligands: Synthesis and Application in the Catalytic Addition of Carboxylic Acids to Internal Alkynes in Water. Catalysts 2019. [DOI: 10.3390/catal9110955] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The synthesis and characterization of novel gold(I) complexes containing hydrophilic ferrocenylphosphino sulfonate ligands, i.e., compounds [AuCl{(η5-C5H3PR2(SO3iPr))Fe(η5-C5H5)}] (R = Ph (2a), p-Tol (2b), Cy (2c)), are presented, including a single-crystal X-ray diffraction study on 2a. Complexes 2a–c were checked as catalysts for the intermolecular addition of carboxylic acids to nonactivated internal alkynes using water as a green reaction medium. The best results in terms of activity were obtained with 2a in combination with AgOAc, which was able to promote the selective anti addition of a variety of aromatic, aliphatic, and α,β-unsaturated carboxylic acids to both symmetrical and unsymmetrical internal alkynes at 60 °C, employing metal loadings of only 2 mol %.
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9
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Xu X, Feng H, Li H, Huang L. Enol Ester Intermediate Induced Metal-Free Oxidative Coupling of Carboxylic Acids and Arylboronic Acids. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900137] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Xianjun Xu
- College of Chemistry and Chemical Engineering; Shanghai University of Engineering Science; 333 Longteng Road 201620 Shanghai China
| | - Huangdi Feng
- College of Chemistry and Chemical Engineering; Shanghai University of Engineering Science; 333 Longteng Road 201620 Shanghai China
| | - Huiqiong Li
- College of Chemistry and Chemical Engineering; Shanghai University of Engineering Science; 333 Longteng Road 201620 Shanghai China
| | - Liliang Huang
- College of Chemistry and Chemical Engineering; Shanghai University of Engineering Science; 333 Longteng Road 201620 Shanghai China
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10
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Panda N, Arpitabala Yadav S. Ni-Catalyzed Deacylative Oxosulfonamidation of Vinyl Acetate. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Niranjan Panda
- Department of Chemistry; National Institute of Technology Rourkela; Odisha- 769008 India
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11
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Panda N, Sahoo K. Synthesis of 4‐Alkenyl Benzoxazoles via Pd‐catalyzed
ortho
C−H Functionalization of 2‐Amidophenols. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801272] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Niranjan Panda
- Department of ChemistryNational Institute of Technology Rourkela Odisha- 769008 India
| | - Kanchanbala Sahoo
- Department of ChemistryNational Institute of Technology Rourkela Odisha- 769008 India
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12
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Panda N, Mattan I, Ojha S, Purohit CS. Synthesis of medium-sized (6-7-6) ring compounds by iron-catalyzed C-H activation/annulation [corrected]. Org Biomol Chem 2018; 16:7861-7870. [PMID: 30303228 DOI: 10.1039/c8ob01496e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this report, we have described a FeCl3-catalyzed process involving intramolecular annulation of o-phenoxy diarylacetylenes via hydroarylation to afford a series of biologically potent fused seven-membered (6-7-6) ring compounds under mild reaction conditions. This reaction was believed to proceed through Friedel-Crafts type sequential carbometallation followed by protonation to produce phenyldibenz[b,f]oxepines. This method was also extended to synthesize seven-membered rings that are fused with coumarins.
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Affiliation(s)
- Niranjan Panda
- Department of Chemistry, National Institute of Technology, Rourkela, Odisha-769008, India.
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13
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Xu X, Feng H, Huang L, Liu X. Direct Amidation of Carboxylic Acids through an Active α-Acyl Enol Ester Intermediate. J Org Chem 2018; 83:7962-7969. [PMID: 29873491 DOI: 10.1021/acs.joc.8b00819] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The development of a highly efficient and simple protocol for the direct amidation of carboxylic acids is described employing ynoates as novel coupling reagents. The transformation proceeds in good to excellent yields via in situ α-acyl enol ester intermediates formation under mild reaction conditions. This useful method has been demonstrated for a range of substrates to provide a succinct access to structurally diverse amides, including key intermediates of glibenclamide, tiapride hydrochloride, and nateglinide, and can be conducted on a mole scale.
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Affiliation(s)
- Xianjun Xu
- College of Chemistry and Chemical Engineering , Shanghai University of Engineering Science , 333 Longteng Road , Shanghai , 201620 , China
| | - Huangdi Feng
- College of Chemistry and Chemical Engineering , Shanghai University of Engineering Science , 333 Longteng Road , Shanghai , 201620 , China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Chinese Academy of Sciences , 345 Lingling Road , Shanghai , 200032 , China
| | - Liliang Huang
- College of Chemistry and Chemical Engineering , Shanghai University of Engineering Science , 333 Longteng Road , Shanghai , 201620 , China
| | - Xiaohui Liu
- College of Chemistry and Chemical Engineering , Shanghai University of Engineering Science , 333 Longteng Road , Shanghai , 201620 , China
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15
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16
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Panda N, Mishra P, Mattan I. Synthesis of Isocoumarins via Silver(I)-Mediated Annulation of Enol Esters. J Org Chem 2016; 81:1047-56. [DOI: 10.1021/acs.joc.5b02602] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Niranjan Panda
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela-769008, Odisha, India
| | - Priyadarshini Mishra
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela-769008, Odisha, India
| | - Irshad Mattan
- Department of Chemistry, National Institute of Technology Rourkela, Rourkela-769008, Odisha, India
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17
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Casavant BJ, Khoder ZM, Berhane IA, Chemler SR. Copper(II)-Promoted Cyclization/Difunctionalization of Allenols and Allenylsulfonamides: Synthesis of Heterocycle-Functionalized Vinyl Carboxylate Esters. Org Lett 2015; 17:5958-61. [PMID: 26624861 DOI: 10.1021/acs.orglett.5b02833] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A unique method to affect intramolecular aminooxygenation and dioxygenation of allenols and allenylsulfonamides is described. These operationally simple reactions occur under neutral or basic conditions where copper(II) carboxylates serve as reaction promoter, oxidant, and carboxylate source. Moderate to high yields of heterocycle-functionalized vinyl carboxylate esters are formed with moderate to high levels of diastereoselectivity. Such vinyl carboxylate esters could serve as precursors to α-amino and α-oxy ketones and derivatives thereof.
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Affiliation(s)
- Barbara J Casavant
- Department of Chemistry, Natural Science Complex, The State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Zainab M Khoder
- Department of Chemistry, Natural Science Complex, The State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Ilyas A Berhane
- Department of Chemistry, Natural Science Complex, The State University of New York at Buffalo , Buffalo, New York 14260, United States
| | - Sherry R Chemler
- Department of Chemistry, Natural Science Complex, The State University of New York at Buffalo , Buffalo, New York 14260, United States
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18
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Liu Y, Wang H, Wan JP. Copper-Catalyzed, C–C Coupling-Based One-Pot Tandem Reactions for the Synthesis of Benzofurans Using o-Iodophenols, Acyl Chlorides, and Phosphorus Ylides. J Org Chem 2014; 79:10599-604. [DOI: 10.1021/jo5017508] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Yunyun Liu
- Key Laboratory of Functional
Small Organic Molecules, Ministry of Education and College of Chemistry
and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Hang Wang
- Key Laboratory of Functional
Small Organic Molecules, Ministry of Education and College of Chemistry
and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Jie-Ping Wan
- Key Laboratory of Functional
Small Organic Molecules, Ministry of Education and College of Chemistry
and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
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