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Journal articles on the topic '2-Pyrones'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Cai, Quan, Xu-Ge Si, and Zhi-Mao Zhang. "Asymmetric Inverse-Electron-Demand Diels–Alder Reactions of 2-Pyrones by Lewis Acid Catalysis." Synlett 32, no. 10 (2021): 947–54. http://dx.doi.org/10.1055/a-1371-4391.

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AbstractDiels–Alder reactions of 2-pyrones with alkenes can provide highly functionalized [2,2,2]-bicyclic lactones under mild reaction conditions. Synthetic utilizations of these reactions have been well demonstrated in natural-product synthesis. Although several catalytic asymmetric strategies have been realized, current research in this area is still largely underdeveloped. Recent advances in enantioselective inverse-electron-demand Diels–Alder reactions with Lewis acid catalysis are reviewed.1 Introduction2 State of the Art of Enantioselective Diels–Alder Reactions of 2-Pyrones by Lewis Ac

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2

Fedin, Vladislav V., Dmitrii L. Obydennov, Sergei A. Usachev, and Vyacheslav Y. Sosnovskikh. "4-Hydroxy-2-pyrones: Synthesis, Natural Products, and Application." Organics 4, no. 4 (2023): 539–61. http://dx.doi.org/10.3390/org4040037.

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4-Hydroxy-2-pyrones are of interest as potential biorenewable molecules for a sustainable transition from biomass feedstock to valuable chemical products. This review focuses on the methodologies for the synthesis of 4-hydroxy-2-pyrones published over the last 20 years. These pyrones as polyketides are widespread in Nature and possess versatile bioactivity that makes them an attractive target for synthesis and modification. Biosynthetic paths of the pyrones are actively developed and used as biotechnological approaches for the construction of natural and unnatural polysubstituted 4-hydroxy-2-p

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3

Knochel, Paul, Dorothée Ziegler, Lydia Klier, Nicolas Müller, and Konstantin Karaghiosoff. "Directed Zincation or Magnesiation of 2- and 4-Pyrones and Their Derivatives." Synthesis 50, no. 22 (2018): 4383–94. http://dx.doi.org/10.1055/s-0037-1610215.

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A regioselective magnesiation of the 2-pyrone scaffold was developed. Magnesiation of this heterocycle by using TMPMgCl·LiCl (TMP = 2,2,6,6-tetramethylpiperidyl) followed by trapping reactions with electrophiles such as aldehydes, allylic bromides, acid chlorides, and aryl iodides provided functionalized 2-pyrones. Furthermore, methyl coumalate and 3,5-dibromo-2H-pyran-2-one were zincated by using TMPZnCl·LiCl to afford zincated heterocycles, which reacted with typical electrophiles. A second magnesiation at position C3 of the 2-pyrone scaffold was achieved by using TMPMgCl·LiCl. Also, the zin

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4

Obydennov, Dmitrii L., Diana I. Nigamatova, Alexander S. Shirinkin, et al. "2-(2-(Dimethylamino)vinyl)-4H-pyran-4-ones as Novel and Convenient Building-Blocks for the Synthesis of Conjugated 4-Pyrone Derivatives." Molecules 27, no. 24 (2022): 8996. http://dx.doi.org/10.3390/molecules27248996.

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A straightforward approach for the construction of the new class of conjugated pyrans based on enamination of 2-methyl-4-pyrones with DMF-DMA was developed. 2-(2-(Dimethylamino)vinyl)-4-pyrones are highly reactive substrates that undergo 1,6-conjugate addition/elimination or 1,3-dipolar cycloaddition/elimination followed by substitution of the dimethylamino group without ring opening. This strategy includes selective transformations leading to conjugated and isoxazolyl-substituted 4-pyrone structures. The photophysical properties of the prepared 4-pyrones were determined in view of further des

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5

Jones, Raymond C. F., Gurdip Bhalay, Jacqueline M. Patience, and Pravin Patel. "A Pyrone Strategy for the Synthesis of 3-Acyltetramic Acids." Journal of Chemical Research 23, no. 4 (1999): 250–51. http://dx.doi.org/10.1177/174751989902300402.

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6

Murray, L., G. Currie та RJ Capon. "A New Macrocyclic γ-Pyrone From a Southern Australian Marine Red Alga". Australian Journal of Chemistry 48, № 8 (1995): 1485. http://dx.doi.org/10.1071/ch9951485.

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A new macrocyclic γ- pyrone (10) and two known γ- pyrones (2) and (6) have been isolated from a Victorian collection of Phacelocarpus peperocarpos. The Z geometry about ∆17,18 in (2) has been established for the first time. All structure elucidations were supported by detailed spectroscopic analysis.

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7

Li, Kunlong, Mengdie Zhou, Ziqi Su та ін. "Two new α-Methoxy-γ-Pyrones From the Mangrove Sediment-Derived Streptomyces psammoticus SCSIO NS126". Natural Product Communications 16, № 9 (2021): 1934578X2110414. http://dx.doi.org/10.1177/1934578x211041420.

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Two new α-methoxy- γ-pyrone analogs, 2-methoxy-3-methyl-5,6-diethyl- γ-pyrone (2) and 2-methoxy-3,5-dimethyl-6-propyl- γ-pyrone (3), together with 2-methoxy-3,5-dimethyl-6-ethyl- γ-pyrone (1), firstly isolated from natural sources, were obtained from the EtOAc-solube extract of the mangrove sediment-derived actinomycete strain Streptomyces psammoticus SCSIO NS126, under the optimized fermentation conditions. Their structures were elucidated by detailed spectroscopic analysis and by comparison of their spectroscopic data with those reported in the literature. Those α-methoxy-γ-pyrones were eval

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8

Yu, Miao, Jie Huang, Haibin Zhu, et al. "Facile construction of 2-pyrones under carbene catalysis." RSC Advances 14, no. 39 (2024): 28585–95. http://dx.doi.org/10.1039/d4ra05596a.

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9

Usachev, Sergey A., Diana I. Nigamatova, Daria K. Mysik, Nikita A. Naumov, Dmitrii L. Obydennov, and Vyacheslav Y. Sosnovskikh. "2-Aryl-6-Polyfluoroalkyl-4-Pyrones as Promising RF-Building-Blocks: Synthesis and Application for Construction of Fluorinated Azaheterocycles." Molecules 26, no. 15 (2021): 4415. http://dx.doi.org/10.3390/molecules26154415.

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A convenient and general method for the direct synthesis of 2-aryl-6-(trifluoromethyl)-4-pyrones and 2-aryl-5-bromo-6-(trifluoromethyl)-4-pyrones has been developed on the basis of one-pot oxidative cyclization of (E)-6-aryl-1,1,1-trifluorohex-5-ene-2,4-diones via a bromination/dehydrobromination approach. This strategy was also applied for the preparation of 2-phenyl-6-polyfluoroalkyl-4-pyrones and their 5-bromo derivatives. Conditions of chemoselective enediones bromination were found and the key intermediates of the cyclization of bromo-derivatives to 4-pyrones were characterized. Synthetic

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10

van Dam, Mathieu J. D. "Pyrones et Pyronones. I. Carboxy-3 phényl-6 pyrone-2 et carboxy-6 phényl-3 pyrone-2." Recueil des Travaux Chimiques des Pays-Bas 83, no. 1 (2010): 31–38. http://dx.doi.org/10.1002/recl.19640830104.

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11

Beye, Garrison E., Athanasios Karagiannis, Alieh Kazemeini та Dale E. Ward. "A versatile method for the synthesis of γ-pyrones". Canadian Journal of Chemistry 90, № 11 (2012): 954–64. http://dx.doi.org/10.1139/v2012-067.

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A versatile three-step procedure to annulate a γ-pyrone onto a methylene ketone was developed involving (i) aldol reaction with a dithiolane-protected β-ketoaldehyde, (ii) oxidation of the aldol adduct to a β-diketone, and (iii) treatment of the resulting dithiolane-protected 1,3,5-trione with 2-iodoxybenzoic acid (IBX) and trifluoromethanesulfonic acid (triflic acid; TfOH) in acetonitrile at ambient temperature to give the corresponding γ-pyrone. Cyclization proceeded with IBX alone, but significantly improved yields were obtained with added acid, particularly triflic acid. A dithiolane was m

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12

Cho, Cheon-Gyu, Jung-Sang Park, In-Hak Jung, and Haiwon Lee. "One step preparation of bromo-2-pyrones via bromo-decarboxylation of 2-pyrone-carboxylic acids." Tetrahedron Letters 42, no. 6 (2001): 1065–67. http://dx.doi.org/10.1016/s0040-4039(00)02182-1.

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13

Sietmann, Rabea, Elke Hammer, Michael Specht, Carl E. Cerniglia, and Frieder Schauer. "Novel Ring Cleavage Products in the Biotransformation of Biphenyl by the Yeast Trichosporon mucoides." Applied and Environmental Microbiology 67, no. 9 (2001): 4158–65. http://dx.doi.org/10.1128/aem.67.9.4158-4165.2001.

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ABSTRACT The yeast Trichosporon mucoides, grown on either glucose or phenol, was able to transform biphenyl into a variety of mono-, di-, and trihydroxylated derivatives hydroxylated on one or both aromatic rings. While some of these products accumulated in the supernatant as dead end products, the ortho-substituted dihydroxylated biphenyls were substrates for further oxidation and ring fission. These ring fission products were identified by high-performance liquid chromatography, gas chromatography-mass spectrometry, and nuclear magnetic resonance analyses as phenyl derivatives of hydroxymuco

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14

Mandarino, Dario G., Massayoshi Yoshida, and Otto R. Gottlieb. "Photodimerization of 6-Styryl-2-Pyrones." Journal Of The Brazilian Chemical Society 1, no. 1 (1990): 53–54. http://dx.doi.org/10.5935/0103-5053.19900010.

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15

Somekawa, Kenichi, Tetsuro Shimo, Hiroyuki Yoshimura, and Takaaki Suishu. "Photo-Cycloaddition Reactions of 2-Pyrones." Bulletin of the Chemical Society of Japan 63, no. 12 (1990): 3456–61. http://dx.doi.org/10.1246/bcsj.63.3456.

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16

Fehr, Matthias J., Giambattista Consiglio, Michelangelo Scalone, and Rudolf Schmid. "Asymmetric Hydrogenation of Substituted 2-Pyrones." Journal of Organic Chemistry 64, no. 16 (1999): 5768–76. http://dx.doi.org/10.1021/jo982215l.

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17

Groutas, William C., Tien L. Huang, Michael A. Stanga, Michael J. Brubaker, and Min K. Moi. "Substituted 2-Pyrones and 5,6-Dihydropyrones." Journal of Heterocyclic Chemistry 22, no. 2 (1985): 433–35. http://dx.doi.org/10.1002/jhet.5570220243.

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18

Liang, Xuefeng, Weijian Ye, Waygen Thor, et al. "Construction of cyclopenta[b]pyran-2-ones via chemoselective (3 + 2) cycloaddition between 2-pyrones and vinyl cyclopropanes." Organic Chemistry Frontiers 7, no. 6 (2020): 840–45. http://dx.doi.org/10.1039/d0qo00049c.

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19

Mahato, Sanjit K., Jayaraman Vinayagam, Sumit Dey, Ajay K. Timiri, Sourav Chatterjee, and Parasuraman Jaisankar. "InCl3 Catalysed One-Pot Synthesis of Substituted Pyrroles and 2-Pyrones." Australian Journal of Chemistry 66, no. 2 (2013): 241. http://dx.doi.org/10.1071/ch12359.

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An efficient InCl3 catalysed one-pot strategy has been developed for the synthesis of tetra-substituted pyrroles and tri-substituted 2-pyrones in very good yields. Tetra-substituted pyrroles were prepared from 1,4-enediones and β-dicarbonyls employing NH4OAc as a nitrogen source, through a combination of Michael addition and Paal–Knorr methods. Tri-substituted 2-pyrones were synthesised from 1,4-ynediones and appropriate β-dicarbonyls using a sequential Michael addition and 6-exo-trig cyclisation.

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20

Nin, Alejandro, Oscar Varela, and Rosa M. de Lederkremer. "Ready Conversion of Sugar Derived 5,6-Dihydro-2-pyrones into 3-Acyloxy- and 3-Acylamido-2-Pyrones." Synthesis 1991, no. 01 (1991): 73–74. http://dx.doi.org/10.1055/s-1991-26383.

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21

AKILANDESWARI, LAKSHMINARAYANAN, and PONNAMBALAM VENUVANALINGAM. "COMPUTATIONAL INSIGHTS ON THE LONE PAIR INDUCED BARRIER MODULATION IN THE THERMAL REARRANGEMENT OF 6-HALO-2-PYRONES." Journal of Theoretical and Computational Chemistry 06, no. 02 (2007): 233–43. http://dx.doi.org/10.1142/s0219633607003040.

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2-pyrones undergo intramolecular thermal rearrangement resulting in the migration of groups at 3-position to 5-position and vice-versa. Rearrangement of 6-halopyrone is a tandem process involving electrocyclic ring opening and closure (ERO & ERC), rotation, sigmatropic shift. It has been modeled at MP2/6-31g (d) level to understand the migratory aptitude of the halogens. Computations show that electrocyclic transition state and the corresponding intermediate which could not be located in 2-pyrone rearrangement have been located for 6-fluoropyrone and 6-chloropyrone. Halogens effectively mo

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22

van Dam, M. J. D., and F. Kögl. "Pyrones et Pyronones. II Synthèse d'alcoyl-6 pyrones-2 par réduction d'alcoyl-6 pyronones." Recueil des Travaux Chimiques des Pays-Bas 83, no. 1 (2010): 39–49. http://dx.doi.org/10.1002/recl.19640830105.

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23

Cho, Cheon-Gyu, Jung-Sang Park, In-Hak Jung, and Haiwon Lee. "ChemInform Abstract: One-Step Preparation of Bromo-2-pyrones via Bromo-Decarboxylation of 2-Pyrone-carboxylic Acids." ChemInform 32, no. 22 (2010): no. http://dx.doi.org/10.1002/chin.200122101.

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24

Kume, Takashi, Toshikatsu Kojima, Hideharu Iwasaki, Yohsuke Yamamoto, and Kinya Akiba. "Synthesis of 3,4-disubstituted 3,4-dihydro-2-pyrones via 2-(silyloxy)pyrylium salts: regioselective introduction of substituents into 2-pyrones." Journal of Organic Chemistry 54, no. 8 (1989): 1931–35. http://dx.doi.org/10.1021/jo00269a034.

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25

Afarinkia, Kamyar, Victoria Vinader, Todd D. Nelson, and Gary H. Posner. "Diels-Alder cycloadditions of 2-pyrones and 2-pyridones." Tetrahedron 48, no. 42 (1992): 9111–71. http://dx.doi.org/10.1016/s0040-4020(01)85607-6.

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26

Fairlamb, Ian J. S., Lester R. Marrison, Julia M. Dickinson, Feng-Ju Lu, and Jan Peter Schmidt. "2-Pyrones possessing antimicrobial and cytotoxic activities." Bioorganic & Medicinal Chemistry 12, no. 15 (2004): 4285–99. http://dx.doi.org/10.1016/j.bmc.2004.01.051.

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27

SOMEKAWA, K., T. SHIMO, H. YOSHIMURA, and T. SUISHU. "ChemInform Abstract: Photocycloaddition Reactions of 2-Pyrones." ChemInform 22, no. 13 (2010): no. http://dx.doi.org/10.1002/chin.199113098.

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28

Sakakura, Akira, Kai Onda та Ichiro Hayakawa. "Reinvestigation of the Biomimetic Cyclization of 3,5-Diketo Esters: Application to the Total Synthesis of Cyercene A, an α-Methoxy-γ-Pyrone-Containing Polypropionate". Synlett 28, № 13 (2017): 1596–600. http://dx.doi.org/10.1055/s-0036-1588795.

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The biomimetic cyclization of 3,5-diketo esters was reinvestigated for the synthesis of α-methoxy-γ-pyrones. 3,5-Diketo esters were selectively synthesized via the aldol reaction of commercially available methyl 2-methyl-3-oxopentanoate with an aldehyde followed by the oxidation with AZADOL® and PhI(OAc)2. The DBU-promoted intramolecular transesterification of 3,5-diketo esters showed excellent reactivity in MeOH, to give the corresponding γ-hydroxy-α-pyrones in high yields under mild reaction conditions. Based on the present cyclization scheme, the total synthesis of cyercene A was achieved.

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29

Lee, Jin-Hee, Jung-Sang Park, and Cheon-Gyu Cho. "Regioselective Synthesis of 3-Alkynyl-5-bromo-2-pyrones via Pd-Catalyzed Couplings on 3,5-Dibromo-2-pyrone." Organic Letters 4, no. 7 (2002): 1171–73. http://dx.doi.org/10.1021/ol025613q.

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30

Lee, Jin-Hee, Jung-Sang Park, and Cheon-Gyu Cho. "Regioselective Synthesis of 3-Alkynyl-5-bromo-2-pyrones via Pd-Catalyzed Couplings on 3,5-Dibromo-2-pyrone." ChemInform 33, no. 35 (2010): 131. http://dx.doi.org/10.1002/chin.200235131.

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31

NIN, A., O. VARELA, and R. M. DE LEDERKREMER. "ChemInform Abstract: Ready Conversion of Sugar-Derived 5,6-Dihydro-2-pyrones into 3-Acyloxy- and 3-Acylamido-2-pyrones." ChemInform 22, no. 36 (2010): no. http://dx.doi.org/10.1002/chin.199136194.

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32

P., HALDAR, CHOWDHURI A., K. DAS A., and BHATTACHARYYA ANJAN. "Occurrence of Aurentiacin in Didymocarpus podocarpa." Journal Of Indian Chemical Society Vol. 66, Jan 1989 (1989): 68–69. https://doi.org/10.5281/zenodo.6137571.

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Department of Agricultural Chemistry and Soil Science, Bidhan Chandra Krishi Viswavidyalaya, Kalyani-741 236 <em>Manuscript received 18 July 2988, accepted 4 October 1988</em> PHYTOCHEMICAL investigation on two <em>Didymocarpus </em>species, <em>D. pedicellata </em>and <em>D. aurentiaca </em>led to the isolation of a number of chalcones<sup>1</sup>, quinochalcones<sup>2</sup>, flavanones<sup>3</sup>, terpenoids<sup>4</sup> and \(\propto\)pyrones<sup>6</sup>. Recently, three kaurenoid diterpenes have been reported from another <em>Didymocarpus </em>sp., <em>D. oblonga<sup>6</sup>

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33

Xu, Li-Chen, Peng Zhou, Jia-Zhuo Li, Wen-Juan Hao, Shu-Jiang Tu, and Bo Jiang. "Thiazolium salt-catalyzed [3 + 2 + 1] cyclization for the synthesis of trisubstituted 2-pyrones using arylglyoxals as a carbonyl source." Organic Chemistry Frontiers 5, no. 5 (2018): 753–59. http://dx.doi.org/10.1039/c7qo00899f.

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A new thiazolium salt-catalyzed [3 + 2 + 1] cyclization of acetylenedicarboxylates with arylglyoxals has been developed, enabling organocatalytic umpolung to access trisubstituted 2-pyrones with good yields via C–C bond cleavage.

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34

Cook, Luisa, Bela Ternai, and Peter Ghosh. "Inhibition of human sputum elastase by substituted 2-pyrones. 2." Journal of Medicinal Chemistry 30, no. 6 (1987): 1017–23. http://dx.doi.org/10.1021/jm00389a010.

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35

Lohaus, Edith, Claudia Zenger, Wolfhart Rüdiger та Edmund Cmiel. "Natural Inhibitors of Germination and Growth, III New α-Pyrones from Seeds of Rosa canina". Zeitschrift für Naturforschung C 40, № 7-8 (1985): 490–95. http://dx.doi.org/10.1515/znc-1985-7-806.

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Abstract The new α-pyrone derivative II was isolated in crystalline form from extracts of dormant seeds of Rosa canina. It inhibits germination of seeds of Amaranthus caudatus completely, but reversibly, at conc. > 2.5 × 10-5 м . Its chemical structure was elucidated by mass spectrometry, 1H-and 13C-NMR spectroscopy to be 3-methyl-1-oxa-bicyclo (4,1,0) hept-5-en-2-one-4,6-dicarboxylic acid dimethylester (II). It is derived from 3-methyl-2H-pyran-2-one-4,6-dicarboxylic acid by cyclo-propanation with diazomethane. The parent compound which is a natural product of the seeds of Rosa canina was

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36

Cha, Jin K., Thomas M. Harris, John A. Ray, and Hemalatha Venkataraman. "Nucleophilic attack on 4,6-dimethoxy-2-pyrones; discovery of a remarkably facile rearrangement of the pyrones." Tetrahedron Letters 30, no. 27 (1989): 3505–8. http://dx.doi.org/10.1016/s0040-4039(00)99425-5.

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37

Lee, Jong. "Recent Advances in the Synthesis of 2-Pyrones." Marine Drugs 13, no. 3 (2015): 1581–620. http://dx.doi.org/10.3390/md13031581.

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38

Frébault, Frédéric, Maria Teresa Oliveira, Eckhard Wöstefeld, and Nuno Maulide. "A Concise Access to 3-Substituted 2-Pyrones." Journal of Organic Chemistry 75, no. 22 (2010): 7962–65. http://dx.doi.org/10.1021/jo101843a.

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39

Afarinkia, Kamyar, and Jose Berna-Canovas. "Diels–Alder cycloaddition of 5-aryl-2-pyrones." Tetrahedron Letters 41, no. 25 (2000): 4955–58. http://dx.doi.org/10.1016/s0040-4039(00)00744-9.

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40

Somekawa, Kenichi, Tetsuro Shimo, and Takaaki Suishu. "MO Analysis of Photocycloaddition Reactions of 2-Pyrones." Bulletin of the Chemical Society of Japan 65, no. 2 (1992): 354–59. http://dx.doi.org/10.1246/bcsj.65.354.

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41

Burkhardt, Immo, and Jeroen S. Dickschat. "Synthesis and Absolute Configuration of Natural 2-Pyrones." European Journal of Organic Chemistry 2018, no. 24 (2018): 3144–57. http://dx.doi.org/10.1002/ejoc.201800621.

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42

Fehr, Matthias J., Giambattista Consiglio, Michelangelo Scalone, and Rudolf Schmid. "ChemInform Abstract: Asymmetric Hydrogenation of Substituted 2-Pyrones." ChemInform 30, no. 52 (2010): no. http://dx.doi.org/10.1002/chin.199952035.

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43

Wu, Wanqing, Shuzhong He, Xiongfei Zhou, and Chi-Sing Lee. "Diels-Alder Cycloadditions of 5-Hydroxy-2-pyrones: 2H-Pyran-2,5-diones and 5-(tert-Butyldimethylsilyloxy)-2-pyrones as Synthons." European Journal of Organic Chemistry 2010, no. 6 (2010): 1124–33. http://dx.doi.org/10.1002/ejoc.200901040.

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44

Zheng, Yao-Yao, Zhao-Yang Liang, Nan-Xing Shen та ін. "New Naphtho-γ-Pyrones Isolated from Marine-Derived Fungus Penicillium sp. HK1-22 and Their Antimicrobial Activities". Marine Drugs 17, № 6 (2019): 322. http://dx.doi.org/10.3390/md17060322.

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Three novel monomeric naphtho-γ-pyrones, peninaphones A–C (compounds 1–3), along with two known bis-naphtho-γ-pyrones (compounds 4 and 5) were isolated from mangrove rhizosphere soil-derived fungus Penicillium sp. HK1-22. The absolute configurations of compounds 1 and 2 were determined by electronic circular dichroism (ECD) spectra, and the structure of compound 3 was confirmed by single-crystal X-ray diffraction analysis. Compounds 4 and 5 are a pair of hindered rotation isomers. A hypothetical biosynthetic pathway for the isolated monomeric and dimeric naphtho-γ-pyrones is also discussed in

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45

Bankar, Siddheshwar K., Jopaul Mathew та S. S. V. Ramasastry. "Synthesis of benzofurans via an acid catalysed transacetalisation/Fries-type O → C rearrangement/Michael addition/ring-opening aromatisation cascade of β-pyrones". Chemical Communications 52, № 32 (2016): 5569–72. http://dx.doi.org/10.1039/c6cc01016d.

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46

Gusarova, Nina K., Pavel A. Volkov, Nina I. Ivanova, et al. "Reactions of 2- and 4-pyrones with secondary phosphine chalcogenides: a facile synthesis of functional phosphorylated pyrones." Tetrahedron Letters 54, no. 49 (2013): 6772–75. http://dx.doi.org/10.1016/j.tetlet.2013.10.016.

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47

Yan, Weitao, Ruo Wang, Tesen Zhang, et al. "Synthesis of 4-trifluoromethyl 2-pyrones and pyridones through the Brønsted base-catalyzed Pechmann-type reaction with cyclic 1,3-diones." Organic & Biomolecular Chemistry 16, no. 48 (2018): 9440–45. http://dx.doi.org/10.1039/c8ob02701c.

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48

Nolan, Marie-T., Leticia M. Pardo, Aisling M. Prendergast, and Gerard P. McGlacken. "Intramolecular Direct Arylation of 3-Halo-2-pyrones and 2-Coumarins." Journal of Organic Chemistry 80, no. 21 (2015): 10904–13. http://dx.doi.org/10.1021/acs.joc.5b02027.

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49

Haddad, Nizar, and Irina Kusmenkov. "Studies on the intramolecular [2+2] photocycloaddition of dihydro-4-pyrones." Tetrahedron Letters 34, no. 38 (1993): 6127–30. http://dx.doi.org/10.1016/s0040-4039(00)61747-1.

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