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Vinodkumar R, Nakate AK, Sharma H, Vanka K, Rama Krishna G, Kontham R. Brønsted Acid-Promoted Cyclodimerization of α,β-Unsaturated γ-Ketoesters: Construction of Fused Pyrano-ketal-lactones and γ-Ylidene-butenolides. ACS OMEGA 2024; 9:19859-19878. [PMID: 38737031 PMCID: PMC11079881 DOI: 10.1021/acsomega.3c08873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 12/12/2023] [Accepted: 01/09/2024] [Indexed: 05/14/2024]
Abstract
Unprecedented MsOH-promoted diastereoselective cascade dimerization and intramolecular lactonization of readily accessible α,β-unsaturated γ-ketoesters are presented. The results obtained in this work, control experiments, and density functional theory (DFT) calculations suggested that the initial enolization and E to Z isomerization/equilibration of olefin (C=C) of substrate α,β-unsaturated γ-ketoesters give a Z-isomer preferentially over an E-isomer. Subsequently, the Z-isomer undergoes intermolecular annulation with α,β-unsaturated γ-ketoesters via domino Michael addition/ketalization/lactonization steps to furnish fused tetracyclic pyrano-ketal-lactone. However, the Z-isomer prefers intramolecular trans-esterification in a competing pathway and gives bicyclic γ-ylidene-butenolide. The key features of this work include simple Brønsted acid catalysis, the formation of three bonds, two rings, and three contiguous stereogenic centers in a single step, DFT calculations, and the assignment of relative stereochemistry through X-ray diffraction (XRD) and two-dimensional (2D) nuclear magnetic resonance (NMR) analyses.
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Affiliation(s)
- Ramavath Vinodkumar
- Organic
Chemistry Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ashwini K. Nakate
- Organic
Chemistry Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Himanshu Sharma
- Physical
and Materials Chemistry Division, CSIR-National
Chemical Laboratory, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Kumar Vanka
- Physical
and Materials Chemistry Division, CSIR-National
Chemical Laboratory, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Gamidi Rama Krishna
- Organic
Chemistry Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Center
for Materials Characterization, CSIR-National
Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Ravindar Kontham
- Organic
Chemistry Division, CSIR-National Chemical
Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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Liang S, Zhou Y, Yu W. Iron-Catalyzed Denitrogenative Annulation Reactions between α-Azido Acetamides and Cyclic Ketones. Org Lett 2024; 26:613-618. [PMID: 38215045 DOI: 10.1021/acs.orglett.3c03883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2024]
Abstract
We report an FeCl2-catalyzed annulation reaction between α-azido acetamides and cyclic ketones. Two types of α,β-unsaturated γ-lactam products can be obtained, depending on the reaction conditions. When α-azido acetamides were reacted with cyclohexanone, 8-amino-5,6,7,8-tetrahydro-1H-indol-2(4H)-ones were obtained when a primary amine was present in the reaction system; conducting the reaction in the presence of 2-aminobenzenesulfonic acid, on the contrary, resulted in the formation of 5,6-dihydro-1H-indol-2(4H)-ones. Cycloheptanone and cyclooctanone reacted in the same way as cyclohexanone. The reactions proceed via the intermediacy of 2-iminoacetamides, which are formed by FeCl2-facilitated dinitrogenation of α-azido acetamides. These reactions constitute a new strategy for expanding the synthetic dimensions of organic azides.
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Affiliation(s)
- Siyu Liang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yuxin Zhou
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Wei Yu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Madhavan S, Keshri SK, Kapur M. Transition Metal‐Mediated Functionalization of Isoxazoles: A Review. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100560] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Suchithra Madhavan
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road Bhopal 462066, MP India
| | - Santosh Kumar Keshri
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road Bhopal 462066, MP India
| | - Manmohan Kapur
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road Bhopal 462066, MP India
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Mardjan MID, Mayooufi A, Parrain JL, Thibonnet J, Commeiras L. Straightforward Access to a Great Diversity of Complex Biorelevant γ-Lactams Thanks to a Tunable Cascade Multicomponent Process. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.9b00438] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Muhammad Idham Darussalam Mardjan
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Bulaksumur POS BLS 21, Yogyakarta 55281, Indonesia
| | - Atef Mayooufi
- Laboratoire SIMBA, EA7502, Université de Tours, Faculté des Sciences et Techniques, Parc de Grandmont, 32 Av. Monge, 37200 Tours, France
| | - Jean-Luc Parrain
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France
| | - Jérôme Thibonnet
- Laboratoire SIMBA, EA7502, Université de Tours, Faculté des Sciences et Techniques, Parc de Grandmont, 32 Av. Monge, 37200 Tours, France
| | - Laurent Commeiras
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille, France
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Hoffmann M, Mufusama Koy Sita J, Kleider C, Gunesch S, Rothmund B, Lehmann L, Bringmann G, Decker M. (R)‐
Tonkafuranone and related compounds: Improved synthesis, stereochemical purity in nature, and bioactivities of the pure enantiomers. FLAVOUR FRAG J 2019. [DOI: 10.1002/ffj.3513] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Matthias Hoffmann
- Institute of Pharmacy and Food ChemistryUniversity of Würzburg Würzburg Germany
| | - Jean‐Pierre Mufusama Koy Sita
- Institute of Organic ChemistryUniversity of Würzburg Würzburg Germany
- Faculté des Sciences Pharmaceutiques Université de Kinshasa Kinshasa Democratic Republic of the Congo
| | - Carolin Kleider
- Institute of Pharmacy and Food ChemistryUniversity of Würzburg Würzburg Germany
| | - Sandra Gunesch
- Institute of Pharmacy and Food ChemistryUniversity of Würzburg Würzburg Germany
| | - Bruno Rothmund
- Institute of Pharmacy and Food ChemistryUniversity of Würzburg Würzburg Germany
| | - Leane Lehmann
- Institute of Pharmacy and Food ChemistryUniversity of Würzburg Würzburg Germany
| | - Gerhard Bringmann
- Institute of Organic ChemistryUniversity of Würzburg Würzburg Germany
| | - Michael Decker
- Institute of Pharmacy and Food ChemistryUniversity of Würzburg Würzburg Germany
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Palange MN, Gonnade RG, Kontham R. TiCl 4-n-Bu 3N-mediated cascade annulation of ketones with α-ketoesters: a facile synthesis of highly substituted fused γ-alkylidene-butenolides. Org Biomol Chem 2019; 17:5749-5759. [PMID: 31124555 DOI: 10.1039/c9ob00649d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile protocol for the synthesis of highly substituted fused γ-alkylidene butenolides using direct annulation of ketones with α-ketoesters, which proceeds through TiCl4-n-Bu3N mediated aldol addition followed by an intramolecular enol-lactonization/cyclization cascade, is reported. Diverse 6-5, 7-5 and 8-5 fused bicyclic γ-ylidene butenolides and highly substituted monocyclic analogs related to biologically relevant natural products were prepared from readily accessible ketone and α-ketoester building blocks. The highly step-economic cascade nature, good substrate scope, easy access to complex products with good to excellent yields, gram-scalability, demonstration of synthetic utility, and unambiguous structural confirmation through X-ray crystallography analyses and analogy are the salient features of this work.
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Affiliation(s)
- Megha N Palange
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune-411008, India.
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Monaco A, Szulc BR, Rao ZX, Barniol-Xicota M, Sehailia M, Borges BMA, Hilton ST. Short Total Synthesis of (±)-γ-Lycorane by a Sequential Intramolecular Acylal Cyclisation (IAC) and Intramolecular Heck Addition Reaction. Chemistry 2017; 23:4750-4755. [PMID: 28217842 DOI: 10.1002/chem.201700143] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Indexed: 01/23/2023]
Abstract
An intramolecular acylal cyclisation (IAC) approach to the synthesis of a range of bicyclic heterocycles is reported. As an example of the utility of the IAC reaction, the methodology was applied in a protecting-group-free five-step total synthesis of (±)-γ-lycorane, incorporating a new intramolecular Heck addition reaction to generate the pentacyclic core structure of the natural product in good yield.
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Affiliation(s)
- Alessandra Monaco
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
| | - Blanka R Szulc
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
| | - Zenobia X Rao
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
| | - Marta Barniol-Xicota
- Laboratori de Química Farmacèutica (Unitat Associada al CSIC), Facultat de Farmàcia, Institute of Biomedicine (IBUB), Universitat de Barcelona, Av. Joan XXIII, s/n, 08028, Barcelona, Spain
| | - Moussa Sehailia
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
| | - Bruno M A Borges
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
| | - Stephen T Hilton
- UCL School of Pharmacy, University College London, 29-39 Brunswick Square, London, WC1N 1AX, UK
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Galenko AV, Khlebnikov AF, Novikov MS, Pakalnis VV, Rostovskii NV. Recent advances in isoxazole chemistry. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4503] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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9
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Ukaji Y, Tanaka Y, Iwamoto R, Sakata R, Soeta T, Endo K, Fujinami S, Inomata K. Regioselective Introduction of Substituents to the meso-Position of Pyrromethenone Derivative – Application to the Synthesis of Sterically Fixed Phytochrome Chromophore Anchored to the C15 meso-Position. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)97] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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Park BR, Lim CH, Lim JW, Kim JN. Facile Synthesis of 5-Alkylidene-1,5-dihydropyrrol-2-ones from Morita-Baylis-Hillman Adducts. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.4.1337] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Borthakur M, Gogoi S, Gogoi J, Boruah RC. Lewis acid catalyzed rapid synthesis of 5-hydroxy-benzo[g]indole scaffolds by a modified Nenitzescu reaction. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.129] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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12
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Molander GA, Canturk B, Kennedy LE. Scope of the Suzuki-Miyaura cross-coupling reactions of potassium heteroaryltrifluoroborates. J Org Chem 2009; 74:973-80. [PMID: 19105735 DOI: 10.1021/jo802590b] [Citation(s) in RCA: 188] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A wide variety of bench-stable potassium heteroaryltrifluoroborates were prepared, and general reaction conditions were developed for their cross-coupling to aryl and heteroaryl halides. The cross-coupled products were obtained in good to excellent yields. This method represents an efficient and facile installation of heterocyclic building blocks onto preexisting organic substructures.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
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