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Journal articles on the topic 'Pyrazolones'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 June 2025

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1

Sun, Jun-Shu, Ying-Ying Wang, Man Liu, et al. "Construction of pyrazolone analogues via rhodium-catalyzed C–H activation from pyrazolones and non-activated free allyl alcohols." Organic Chemistry Frontiers 6, no. 15 (2019): 2713–17. http://dx.doi.org/10.1039/c9qo00504h.

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2

Gediz Erturk, Aliye, and Hilal Omerustaoglu. "Synthesis and Cytotoxic Evaluation of Some Substituted 5-Pyrazolones and Their Urea Derivatives." Molecules 25, no. 4 (2020): 900. http://dx.doi.org/10.3390/molecules25040900.

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In this paper, a series of new substituted-5-pyrazolones were first synthesized, then formulated by the Vilsmeier–Haack reaction to obtain substituted-4-carbaldehyde-5-pyrazolones. In the final step, when urea was reacted with formulated pyrazolones, we found that, instead of the C=N bond in azomethine form, the compounds tautomerized to form a series of novel pyrazole-4-ylidenemethylurea structures. The structures of these compounds were elucidated by FTIR, 1H, 13C NMR, LC-MS/MS, and elemental analysis methods. The cytotoxic and antioxidant effects of substituted 5-pyrazolones and their pyrazolone-urea derivatives were investigated in metastatic A431 and noncancerous HaCaT human keratinocytes by a mitochondrial activity test. The effects of the compounds on the migration of cancerous and noncancerous cell lines were investigated by using a cell scratch assay. The General Linear Model, Statistical Package for Social Sciences (SPSS v26) was used to determine if there was a statistically significant difference between the control and the treatment groups. Four of the nine compounds showed an antioxidant effect. All 5-pyrazolone-urea compounds showed higher toxicity (p < 0.05) in cancerous A431 cells compared to noncancerous cells at all time points. All compounds also showed a biphasic hormetic effect. Four of the nine compounds inhibited cell migration.

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3

Yang, Kai, Xiaoze Bao, Ye Yao, Jingping Qu, and Baomin Wang. "Iodine-mediated cross-dehydrogenative coupling of pyrazolones and alkenes." Organic & Biomolecular Chemistry 16, no. 34 (2018): 6275–83. http://dx.doi.org/10.1039/c8ob01645c.

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4

Zhang, Wande, Shah Nawaz, Yue Huang, et al. "C-4 benzofuranylation of pyrazolones by a metal-free catalyzed indirect heteroarylation strategy." Organic & Biomolecular Chemistry 19, no. 46 (2021): 10215–22. http://dx.doi.org/10.1039/d1ob01920a.

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A metal-free catalyzed indirect heteroarylation of pyrazolones with 2-(3-hydroxy-3,3-diarylprop-1-yn-1-yl)phenols has been developed, delivering a wide range of novel 4-benzofuran-substituted pyrazolone derivatives.

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5

Wei, Shiqiang, Xiaoze Bao, Wenyao Wang, et al. "Enantioselective construction of dispirotriheterocycles featuring a 4-aminopyrazolone motif through a cascade Michael/cyclization process." Chemical Communications 56, no. 73 (2020): 10690–93. http://dx.doi.org/10.1039/d0cc04215c.

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A highly asymmetric approach to multicyclic dispiro [pyrazolone-pyrrolidinethione-oxindole] core structures bearing three contiguous stereogenic centers through a cascade Michael addition/cyclization reaction of 4-isothiocyanato pyrazolones with 3-ylideneoxindoles was developed.

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6

Pattan, S. R., P. A. Chavan, R. A. Muluk, et al. "SYNTHESIS AND BIOLOGICAL EVALUATION OF SOME HETEROCYCLES CONTAINING OXADIAZOLE AND PYRAZOLE RING FOR ANTI-BACTERIAL, ANTI-FUNGAL AND ANTI-TUBERCULAR ACTIVITIES." INDIAN DRUGS 49, no. 03 (2012): 18–24. http://dx.doi.org/10.53879/id.49.03.p0018.

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1, 3, 4-oxadiazoles were synthesized by treating pyrazine-2-carbohydrazide with CS2 and alc. KOH and their derivatives were prepared by using R-Cl compounds. pyrazolones were synthesized by treatingpyrazine-2-carbohydrazide with ethyl acetoacetate. The derivatives of pyrazolone were prepared by refluxing pyrazolone with formaldehyde and different substituted secondary amines. All the synthesized compounds were characterized by IR, 1H-NMR and elemental analysis and evaluated for antibacterial, antifungal and antitubercular activities.

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7

Morteza, Shiri, Heydari Masumeh, and Zadsirijan Vahideh. "Efficient synthesis of novel functionalized pyrazolo-pyranoquinoline and tetrahydrodibenzo-[1,8]naphthyridinone derivatives." Tetrahedron 73, no. 15 (2017): 2116–22. https://doi.org/10.1016/j.tet.2017.02.064.

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The facile and efficient synthesis of 1,4-dihydropyrazolo-pyrano-[2,3-b]quinoline derivatives from the reaction of 2-chloroquinoline-3-carbaldehydes and pyrazolones is described. Moreover, a one-pot method for the development of functionalized tetrahydrodibenzo[b,g][1,8]naphthyridinone derivatives is reported by using a threecomponent reaction of 2-chloroquinoline 3-carbaldehydes, pyrazolone, and enaminones catalyzed by L-proline in EtOH.

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8

Sreeramula, Samyami, and Shiv Brat Singh. "Recent Advances in the Therapeutic Applications of Pyrazolone and Oxazolone Derivatives." Journal of Advances in Science and Technology 20, no. 2 (2023): 426–33. https://doi.org/10.29070/9k5z5k50.

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There are several important medicinal uses for the heterocyclic compounds known as pyrazolones and oxazolones. They have a wide range of biological effects, such as reducing inflammation, alleviating pain, fighting bacteria, preventing cancer, and protecting neurones. The synthesis, pharmacological characteristics, and therapeutic potential of pyrazolone and oxazolone derivatives are highlighted in this overview of current research. Included in the discussion are their action mechanisms, structure-activity connections, and potential for future medication development.

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9

Justin, Jacob Thomas. "A Complete Analysis of The Synthesis and Pharmacological Effects of Pyrazolone Derivatives." International Journal of Pharmacy and Biological Sciences (IJPBS) 13, no. 2 (2023): 149–61. https://doi.org/10.5281/zenodo.10207120.

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AbstractPyrazolone is a five membered lactam ring, containing two nitrogen and one ketonic group in its structure. Pyrazalone's possesses anti-microbial, anti-fungal, antioxidant, anti-inflammatory, cytotoxicity, analgesic, anti-pyretic and anti-depressant activities. They also serve as precursors for dyes, pigments, pesticides, and chelating agents. Generally, the condensation of hydrazines with β-ketoester compounds is the classical method for the synthesis of pyrazolones, followed by reaction with various benzaldehyde derivatives. It is an exciting area of pharmaceutical chemistry to research the biological evaluation of pyrazolone derivatives. This review article provides information about different synthetic schemes and biological activities of various pyrazolone derivatives.KeywordsPyrazolone, Knorr condensation, Phenyl hydrazine, Ethyl Acetoacetate, Biological Activity.

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10

Kashinath, Dhurke, Kota Sathish, and Sakkani Nagaraju. "Synthesis of Spiro Pyrazolone-Oxindole and Bicyclic Pyrazolone Derivatives via Solvent-Dependent Regioselective Aza-1,4/1,6-Michael and Intramolecular Cycloaddition under Catalyst-Free Conditions." SynOpen 05, no. 02 (2021): 123–33. http://dx.doi.org/10.1055/a-1480-9837.

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AbstractA solvent-dependent, highly regioselective [3+2]-cycloaddition reaction of isoxazole-styrenes and azomethine imines under catalyst-free conditions is reported, furnishing a library of pyrazolone–spirooxindole hybrids. Good regioselectivity for the isomeric structures was achieved by the reaction of isoxazole-styrene and azomethine imine in different solvents and temperatures. The developed method was extended for the synthesis of tri-substituted dinitrogen-fused pyrazolones by using a 1,6-Michael addition reaction. Furthermore, the isoxazole moiety was converted into a carboxylic acid as a model study via ring opening.

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11

Hassan, Abdalla E. A., Ahmed H. Moustafa, Mervat M. Tolbah, Hussein F. Zohdy, and Abdelfattah Z. Haikal. "Synthesis and Antimicrobial Evaluation of Novel Pyrazolones and Pyrazolone Nucleosides." Nucleosides, Nucleotides and Nucleic Acids 31, no. 11 (2012): 783–800. http://dx.doi.org/10.1080/15257770.2012.732250.

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12

Chu, Ming-Ming, Suo-Suo Qi, Yi-Feng Wang, et al. "Organocatalytic asymmetric [4 + 1] annulation of in situ generated ortho-quinomethanes with 4-halo pyrazolones: straightforward access to chiral spiro-benzofuran pyrazolones." Organic Chemistry Frontiers 6, no. 12 (2019): 1977–82. http://dx.doi.org/10.1039/c9qo00332k.

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13

Zhao, Xia, Xiaoyu Lu, Lipeng Zhang, Tianjiao Li, and Kui Lu. "One-pot Synthesis of Pyrazolone Sulfones by Iodine-catalyzed Sulfenylation of Pyrazolones with Aryl Sulfonyl Hydrazides Followed by Oxidation in Water." Current Organic Synthesis 15, no. 3 (2018): 380–87. http://dx.doi.org/10.2174/1570179414666171020113745.

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Aim and Objective: Pyrazolone sulfones have been reported to exhibit herbicidal and antibacterial activities. In spite of their good bioactivities, only a few methods have been developed to prepare pyrazolone sulfones. However, the substrate scope of these methods is limited. Moreover, the direct sulfonylation of pyrazolone by aryl sulfonyl chloride failed to give pyrazolone sulfones. Thus, developing a more efficient method to synthesize pyrazolone sulfones is very important. Materials and Method: Pyrazolone, aryl sulphonyl hydrazide, iodine, p-toluenesulphonic acid and water were mixed in a sealed tube, which was heated to 100°C for 12 hours. The mixture was cooled to 0°C and m-CPBA was added in batches. The mixture was allowed to stir for 30 min at room temperature. The crude product was purified by silica gel column chromatography to afford sulfuryl pyrazolone. Results: In all cases, the sulfenylation products were formed smoothly under the optimized reaction conditions, and were then oxidized to the corresponding sulfones in good yields by 3-chloroperoxybenzoic acid (m-CPBA) in water. Single crystal X-ray analysis of pyrazolone sulfone 4aa showed that the major tautomer of pyrazolone sulfones was the amide form instead of the enol form observed for pyrazolone thioethers. Moreover, the C=N double bond isomerized to form an α,β-unsaturated C=C double bond. Conclusion: An efficient method to synthesize pyrazolone thioethers by iodine-catalyzed sulfenylation of pyrazolones with aryl sulfonyl hydrazides in water was developed. Moreover, this method was employed to synthesize pyrazolone sulfones in one-pot by subsequent sulfenylation and oxidation reactions.

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14

Wang, Wenyao, Shiqiang Wei, Xiaoze Bao, Shah Nawaz, Jingping Qu, and Baomin Wang. "Enantioselective [3 + 2] annulation of 4-isothiocyanato pyrazolones and alkynyl ketones under organocatalysis." Organic & Biomolecular Chemistry 19, no. 5 (2021): 1145–54. http://dx.doi.org/10.1039/d0ob02423f.

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15

Zhang, Wande, Shiqiang Wei, Jingping Qu, and Baomin Wang. "Acid-catalyzed allenylation of pyrazolones with propargyl alcohols." Organic & Biomolecular Chemistry 19, no. 22 (2021): 4992–5001. http://dx.doi.org/10.1039/d1ob00592h.

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16

Pedro, José R., Carlos Vila, Laura Carceller-Ferrer, and Gonzalo Blay. "Recent Advances in Catalytic Enantioselective Synthesis of Pyrazolones with a Tetrasubstituted Stereogenic Center at the 4-Position." Synthesis 53, no. 02 (2020): 215–37. http://dx.doi.org/10.1055/s-0040-1707298.

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AbstractPyrazolone [2,4-dihydro-3H-pyrazol-4-one] represents one of the most important five-membered nitrogen heterocycles which is present in numerous pharmaceutical drugs and molecules with biological activity. Recently, many catalytic methodologies for the asymmetric synthesis of chiral pyrazolones have been established with great success, specially, for the synthesis of pyrazolones bearing a tetrasubstituted stereocenter at C-4. This review summarizes these excellent research studies since 2018, including representative examples and some mechanistic pathways explaining the observed stereochemistry.1 Introduction2 Catalytic Enantioselective Synthesis of Chiral Pyrazolones with a Full Carbon Tetrasubstituted Stereocenter at C-43 Catalytic Enantioselective Synthesis of Chiral Pyrazolones with a Quaternary Carbon Stereocenter at C-4 bearing a Heteroatom4 Catalytic Enantioselective Synthesis of Chiral Spiropyrazolones5 Conclusion

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17

Awasthi, Annapurna, Pushpendra Yadav, and Dharmendra Kumar Tiwari. "A three-component, general and practical route for diastereoselective synthesis of aza-spirocyclic pyrazolones via a decarboxylative annulation process." New Journal of Chemistry 45, no. 5 (2021): 2374–83. http://dx.doi.org/10.1039/d0nj05915c.

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An efficient, general, and practical route for highly diastereoselective synthesis of aza-spirocyclic pyrazolones from easily available α-amino acids, aldehydes, and alkylidene pyrazolones by means of a decarboxylative annulation process is reported.

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18

Mukherjee, Prasun, and Asish R. Das. "One-flask synthesis of pyrazolone thioethers involving catalyzed and uncatalyzed thioetherification pathways of pyrazolones." Organic & Biomolecular Chemistry 15, no. 35 (2017): 7267–71. http://dx.doi.org/10.1039/c7ob01754e.

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19

Geng, Jianqi, Xingfu Wei, Biru He, Yuting Hao, Jingping Qu, and Baomin Wang. "Desymmetrization of Prochiral N-Pyrazolyl Maleimides via Organocatalyzed Asymmetric Michael Addition with Pyrazolones: Construction of Tri-N-Heterocyclic Scaffolds Bearing Both Central and Axial Chirality." Molecules 28, no. 11 (2023): 4279. http://dx.doi.org/10.3390/molecules28114279.

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The desymmetrization of N-pyrazolyl maleimides was realized through an asymmetric Michael addition by using pyrazolones under mild conditions, leading to the formation of a tri-N-heterocyclic pyrazole–succinimide–pyrazolone assembly in high yields with excellent enantioselectivities (up to 99% yield, up to 99% ee). The use of a quinine-derived thiourea catalyst was essential for achieving stereocontrol of the vicinal quaternary–tertiary stereocenters together with the C–N chiral axis. Salient features of this protocol included a broad substrate scope, atom economy, mild conditions and simple operation. Moreover, a gram-scale experiment and derivatization of the product further illustrated the practicability and potential application value of this methodology.

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20

Levy, M. "Hypersensitivity to pyrazolones." Thorax 55, no. 90002 (2000): 72S—74. http://dx.doi.org/10.1136/thorax.55.suppl_2.s72.

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21

V, S. JOLLY, Y. DALVI M., and K. SHRIVASTAVA A. "Studies on Pyrazolones. Part-III. Synthesis, Dyeing and Antifungal Activity of some 1-Substituted-3-phenyl-4-(2/4-carboxyphenylazo)-5-pyrazolones." Journal of Indian Chemical Society Vol. 68, Sep 1991 (1991): 513–14. https://doi.org/10.5281/zenodo.5970727.

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Chemical Laboratories, Government Model Science College, Gwalior·474 002 <em>Manuscript received 18 February 1991, revised 29 May 1991, accepted 3 September 1991</em> A series of new pyrazolones and esters have been synthesised. Treatment of ethyl benzoylacetate with diazotistd 2/4-aminobenzoic acid gave ethyl 2-(2/4-carboxy-phenylazo)-2-benzoylacetates. Reaction of the esters with anilinomalonic acid hydrazides gave 1-sutstituted-2-phenyl-4-(2/4-carboxyphenylazo)-5-pyrazolones. The dyes impart mostly light yellow colour of different shades on cotton, silk and wool fibres and light orange to deep brown on nylon fibres in presence of mordants. The pyrazolones were tested for their antifungal activity.

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22

Hassan, Abdalla E. A., Ahmed H. Moustafa, Mervat M. Tolbah, Hussein F. Zohdy, and Abdelfattah Z. Haikal. "ChemInform Abstract: Synthesis and Antimicrobial Evaluation of Novel Pyrazolones and Pyrazolone Nucleosides." ChemInform 44, no. 17 (2013): no. http://dx.doi.org/10.1002/chin.201317110.

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23

Wang, Yi-Feng, Xue-Yang Chen, Zhen-Hui Jiang, et al. "Asymmetric Chlorination of 4-Substituted Pyrazolones Catalyzed by Chiral Copper Complexes." Synlett 31, no. 13 (2020): 1318–22. http://dx.doi.org/10.1055/s-0039-1690879.

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A fast and highly enantioselective chlorination of 4-pyrazolones catalyzed by bis(oxazoline)–Cu(ClO4)2·6H2O complexes has been developed. Under the optimized conditions, a series of pyrazolones bearing stereogenic chlorine-attached carbon centers were obtained in moderate to high yields (up to 98%) and with enantioselectivities of up to 98% ee.

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24

Bingi, Chiranjeevi, Narender Reddy Emmadi, Madhu Chennapuram, Jagadeesh Babu Nanubolu, and Krishnaiah Atmakur. "A simple and catalyst free one pot access to the pyrazolone fused 2,8-dioxabicyclo[3.3.1]nonanes." RSC Adv. 4, no. 66 (2014): 35009–16. http://dx.doi.org/10.1039/c4ra07278b.

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Synthesis of a series of novel aryl and heteroaryl fused 2,8-dioxabicyclo[3.3.1]nonanes (3) was accomplished by one pot, catalyst free reaction of 2-hydroxy chalcones (1) with 3-trifluoromethyl substituted pyrazolones (2) in xylene at reflux temperature. The role of –CF<sub>3</sub> in formation of 3 was confirmed by comparing with 3-methyl pyrazolones.

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25

Nezhad, Shefa Mirani, Seied Ali Pourmousavi, Ehsan Nazarzadeh Zare, Golnaz Heidari, and Pooyan Makvandi. "Magnetic Sulfonated Melamine-Formaldehyde Resin as an Efficient Catalyst for the Synthesis of Antioxidant and Antimicrobial Pyrazolone Derivatives." Catalysts 12, no. 6 (2022): 626. http://dx.doi.org/10.3390/catal12060626.

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Sulfonated polymer-based materials, among heterogeneous catalysts, are frequently utilized in chemical transformations due to their outstanding chemical and physical durability. In this regard, a magnetic sulfonated melamine–formaldehyde resin (MSMF) catalyst was successfully prepared from a mixture of sulfonated melamine–formaldehyde and Fe3O4 nanoparticles in two steps. MSMF was used as a heterogeneous catalyst for the one-pot, three-component condensation of benzyl pyrazolyl naphthoquinones in water as a green solvent and 4-[(indol-3-yl)-arylmethyl]-1-phenyl-3-methyl-5-pyrazolones. The antimicrobial and antioxidant activities of catalyst, benzyl pyrazolyl naphthoquinones, and 4-[(indol-3-yl)-arylmethyl]-1-phenyl-3-methyl-5-pyrazolones were evaluated using agar disk-diffusion and DPPH assays, respectively. The antioxidant activity of the catalyst and 4-[(indol-3-yl)-arylmethyl]-1-phenyl-3-methyl-5-pyrazolones was found to be 75% and 90%, respectively. Furthermore, catalyst, benzyl pyrazolyl naphthoquinones, and 4-[(indol-3-yl)-arylmethyl]-1-phenyl-3-methyl-5-pyrazolones exhibited antimicrobial activity against Staphylococcus aureus and Escherichia coli. In conclusion, MSMF is a superior catalyst for green chemical processes, owing to its high catalytic activity, stability, and reusability.

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26

Achuthanandhan, Jyothi, and Baskar Lakshmanan. "Docking studies of tetra substituted pyrazolone derivatives as potential antiviral agents." JOURNAL OF PHARMACEUTICAL CHEMISTRY 5, no. 2 (2018): 5–8. http://dx.doi.org/10.14805/jphchem.2018.art103.

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In an attempt to find potential antiviral agents, a series of pyrazolones (PA1-PA6& PC1-PC6) were designed and evaluated for their DENVNS5 (RNA-dependent RNA polymerase) inhibitory activity. Molecular docking studies of all the designed compounds into the binding site of DENVNS5 (PDB Code: 4C11) were performed to gain a comprehensive understanding into rational binding modes. These compounds were also screened for in silico drug-likeliness properties on the basis of the absorption, distribution, metabolism and excretion (ADME) prediction. Among all the synthesized compounds, analogue PA6showed superior inhibitory activity against RNA dependent RNA polymerase. SAR study indicated that the presence of an electron withdrawing substitution on pyrazolone derivatives significantly improves its binding interaction with the protein.Results of ADME prediction revealed that most of these compounds showed in silico drug-likeliness.

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27

Yang, Wenjun, Yunpeng Zhang, Shuxian Qiu, et al. "Phosphine-catalyzed [4 + 2] cycloaddition of unsaturated pyrazolones with allenoates: a concise approach toward spiropyrazolones." RSC Advances 5, no. 77 (2015): 62343–47. http://dx.doi.org/10.1039/c5ra11595g.

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28

Guo, Jixi, Li Liu, Dianzeng Jia, Mingxi Guo, Yucai Zhang, and Xianli Song. "Photochromism and fluorescence modulation of pyrazolone derivatives in the solid state." New Journal of Chemistry 39, no. 4 (2015): 3059–64. http://dx.doi.org/10.1039/c4nj01970a.

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29

Wang, Xueli, Xingwei Li, Yao Zhang, and Lixin Xia. "Gold(i)- and rhodium(iii)-catalyzed formal regiodivergent C–H alkynylation of 1-arylpyrazolones." Organic & Biomolecular Chemistry 16, no. 16 (2018): 2860–64. http://dx.doi.org/10.1039/c8ob00585k.

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30

Bao, Xiaoze, Shiqiang Wei, Jingping Qu, and Baomin Wang. "C6′ steric bulk of cinchona alkaloid enables an enantioselective Michael addition/annulation sequence toward pyranopyrazoles." Chemical Communications 54, no. 16 (2018): 2028–31. http://dx.doi.org/10.1039/c8cc00154e.

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31

Warghude, Prakash K., Abhijeet S. Sabale, and Ramakrishna G. Bhat. "Access to highly enantioselective and diastereoselective spirooxindole dihydrofuran fused pyrazolones." Organic & Biomolecular Chemistry 18, no. 9 (2020): 1794–99. http://dx.doi.org/10.1039/d0ob00007h.

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32

Lakshmi, Shanta Raj, Vipin Singh, and L. Raju Chowhan. "Highly efficient catalyst-free domino conjugate addition, decarboxylation and esterification/amidation of coumarin carboxylic acid/esters with pyrazolones: a green chemistry approach." RSC Advances 10, no. 23 (2020): 13866–71. http://dx.doi.org/10.1039/d0ra01906b.

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33

Bao, Xiaoze, Shiqiang Wei, Liwei Zou, et al. "Asymmetric chlorination of 4-substituted pyrazolones catalyzed by natural cinchona alkaloid." Chemical Communications 52, no. 76 (2016): 11426–29. http://dx.doi.org/10.1039/c6cc06236a.

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34

Šimek, Michal, Marek Remeš, Jan Veselý, and Ramon Rios. "Enantioselective Organocatalytic Amination of Pyrazolones." Asian Journal of Organic Chemistry 2, no. 1 (2012): 64–68. http://dx.doi.org/10.1002/ajoc.201200168.

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35

Wei, Ran, Li Gao, Gaihui Li, et al. "Squaramide-catalysed asymmetric Friedel–Crafts alkylation of naphthol and unsaturated pyrazolones." Organic & Biomolecular Chemistry 19, no. 15 (2021): 3370–73. http://dx.doi.org/10.1039/d1ob00347j.

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36

Xiao, Yan, Xiaopeng Wu, Jiangang Teng, Song Sun, Jin-Tao Yu, and Jiang Cheng. "Copper-catalyzed acylation of pyrazolones with aldehydes to afford 4-acylpyrazolones." Organic & Biomolecular Chemistry 17, no. 32 (2019): 7552–57. http://dx.doi.org/10.1039/c9ob01486a.

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37

Krylov, Igor B., Stanislav A. Paveliev, Boris N. Shelimov, et al. "Selective cross-dehydrogenative C–O coupling of N-hydroxy compounds with pyrazolones. Introduction of the diacetyliminoxyl radical into the practice of organic synthesis." Organic Chemistry Frontiers 4, no. 10 (2017): 1947–57. http://dx.doi.org/10.1039/c7qo00447h.

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38

Liu, Xiaobing, Yao Zhou, and Qiuling Song. "Metal-free cyclization of unsaturated hydrazones for the divergent assembly of pyrazolones and pyrazolines." Chemical Communications 55, no. 61 (2019): 8943–46. http://dx.doi.org/10.1039/c9cc04039k.

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39

Wei, Wei, Huanhuan Cui, Daoshan Yang, et al. "Metal-free molecular iodine-catalyzed direct sulfonylation of pyrazolones with sodium sulfinates leading to sulfonated pyrazoles at room temperature." Organic Chemistry Frontiers 4, no. 1 (2017): 26–30. http://dx.doi.org/10.1039/c6qo00403b.

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40

Putatunda, Salil, Juan V. Alegre-Requena, Marta Meazza, et al. "Proline bulky substituents consecutively act as steric hindrances and directing groups in a Michael/Conia-ene cascade reaction under synergistic catalysis." Chemical Science 10, no. 14 (2019): 4107–15. http://dx.doi.org/10.1039/c8sc05258a.

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41

Cheng, Cheng, Xiaobin Sun, Zelin Wu, Qianwei Liu, Liqiang Xiong та Zhiwei Miao. "Lewis base catalyzed regioselective cyclization of allene ketones or α-methyl allene ketones with unsaturated pyrazolones". Organic & Biomolecular Chemistry 17, № 12 (2019): 3232–38. http://dx.doi.org/10.1039/c9ob00179d.

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42

Liu, Xiaoxia, Huanhuan Cui, Daoshan Yang, et al. "Metal-free direct construction of sulfenylated pyrazoles via the NaOH promoted sulfenylation of pyrazolones with aryl thiols." RSC Advances 6, no. 57 (2016): 51830–33. http://dx.doi.org/10.1039/c6ra09739a.

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43

Carceller-Ferrer, Laura, Carlos Vila, Gonzalo Blay, Isabel Fernández, M. Carmen Muñoz та José R. Pedro. "Organocatalytic enantioselective aminoalkylation of pyrazol-3-ones with aldimines generated in situ from α-amido sulfones". Organic & Biomolecular Chemistry 17, № 46 (2019): 9859–63. http://dx.doi.org/10.1039/c9ob02252j.

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44

Yue, Deng-Feng, Jian-Qiang Zhao, Zhen-Hua Wang, Xiao-Mei Zhang, Xiao-Ying Xu, and Wei-Cheng Yuan. "A Neber approach for the synthesis of spiro-fused 2H-azirine-pyrazolone." Organic & Biomolecular Chemistry 14, no. 6 (2016): 1946–49. http://dx.doi.org/10.1039/c5ob02559a.

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Maity, Rajendra, and Subhas Chandra Pan. "Enantioselective aminocatalytic synthesis of tetrahydropyrano[2,3-c]pyrazoles via a domino Michael-hemiacetalization reaction with alkylidene pyrazolones." Organic & Biomolecular Chemistry 15, no. 38 (2017): 8032–36. http://dx.doi.org/10.1039/c7ob02170d.

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Abstract:

An enantioselective organocatalytic synthesis of fused tetrahydropyranopyrazole products has been achieved via a domino Michael-hemiacetalization reaction between alkylidene pyrazolones and cyclic ketones/pentanal.

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46

Zheng, Ya-Yun, Kai-Xiang Feng, Ai-Bao Xia, et al. "Merging catalyst-free synthesis and iodine catalysis: one-pot synthesis of dihydrofuropyrimidines and spirodihydrofuropyrimidine pyrazolones." RSC Advances 9, no. 17 (2019): 9770–76. http://dx.doi.org/10.1039/c9ra01665a.

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Thupyai, Akkharaphong, Chaleena Pimpasri, and Sirilata Yotphan. "DABCO-catalyzed silver-promoted direct thiolation of pyrazolones with diaryl disulfides." Organic & Biomolecular Chemistry 16, no. 3 (2018): 424–32. http://dx.doi.org/10.1039/c7ob02860a.

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Sun, Pengfei, Daoshan Yang, Wei Wei, et al. "DMSO-promoted regioselective synthesis of sulfenylated pyrazoles via a radical pathway." Organic Chemistry Frontiers 4, no. 7 (2017): 1367–71. http://dx.doi.org/10.1039/c7qo00218a.

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Xie, Jin, Xiao-Yu Xing, Feng Sha, Zhi-Yan Wu, and Xin-Yan Wu. "Enantioselective synthesis of spiro[indoline-3,4′-pyrano[2,3-c]pyrazole] derivatives via an organocatalytic asymmetric Michael/cyclization cascade reaction." Organic & Biomolecular Chemistry 14, no. 35 (2016): 8346–55. http://dx.doi.org/10.1039/c6ob01256f.

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Wu, Weirong, Yuxia Liu, and Siwei Bi. "Mechanistic insight into conjugated N–N bond cleavage by Rh(iii)-catalyzed redox-neutral C–H activation of pyrazolones." Organic & Biomolecular Chemistry 13, no. 30 (2015): 8251–60. http://dx.doi.org/10.1039/c5ob00977d.

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