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Journal articles on the topic 'Heterocyclic and condensation'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Su, Biyun, Yifan Hou, Li Wang та ін. "The Syntheses, Characterization and Crystal Structures of a Series of Heterocyclic β-Diketones and Their Isoxazole Compounds". Current Organic Synthesis 16, № 8 (2020): 1174–84. http://dx.doi.org/10.2174/1570179416666191022113022.

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Background: In the field of coordination chemistry, the introduction of heterocyclic substituents into the structure of β-diketone enables ligand to produce multiple coordination sites. The adoption of small steric oxime group into the structure of heterocyclic β-diketone by Schiff-base condensation will further increase coordination sites and facilitate the generation of polynuclear structures. Objective: A series of β-diketones (2a-2c) containing different heterocycles such as pyridine, thiophene and furan and their corresponding isoxazole compounds (3a-3c) were synthesized. Materials and Me

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2

Idrees Ibrahim, Hala. "Synthesis of some new heterocyclic compounds by High- Speed,Microwaveirradiation and pharmacological evaluation." Tikrit Journal of Pharmaceutical Sciences 9, no. 2 (2023): 338–55. http://dx.doi.org/10.25130/tjphs.2013.9.2.17.338.355.

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A series of substituted chalcones (1-4) were synthesized and used to prepare some new membered heterocyclic compounds (Pyrimidinones)(5-12) by their condensation with urea and thiourea, and four membered heterocyclic compounds (Pyrazolines) (13-16) by their condensation with 2,4-dinitrophenyl hydrazine also, four membered heterocyclic compounds (isoxazolines) (17-20) by their condensation with aminohydroxide hydrochloride. All reactions were carried out under microwave irradiation (MW1) is described. The synthesized compounds are characterized by FTIR and C.H.N analysis. We also study the biol

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3

Shoji, Taku, Tetsuo Okujima, and Shunji Ito. "Development of Heterocycle-Substituted and Fused Azulenes in the Last Decade (2010–2020)." International Journal of Molecular Sciences 21, no. 19 (2020): 7087. http://dx.doi.org/10.3390/ijms21197087.

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Azulene derivatives with heterocyclic moieties in the molecule have been synthesized for applications in materials science by taking advantage of their unique properties. These derivatives have been prepared by various methods, involving electrophilic substitution, condensation, cyclization, and transition metal-catalyzed cross-coupling reactions. Herein, we present the development of the synthetic methods, reactivities, and physical properties for the heterocycle-substituted and heterocycle-fused azulenes reported in the last decade.

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4

Borré, Etienne, Georges Dahm, Gilles Guichard, and Stéphane Bellemin-Laponnaz. "Post-functionalization of platinum–NHC complexes by oxime ligation for ligand targeted therapy." New Journal of Chemistry 40, no. 4 (2016): 3164–71. http://dx.doi.org/10.1039/c5nj03104d.

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5

Fernandes, Sara S. M., Maria Cidália R. Castro, Dzmitry Ivanou, Adélio Mendes, and Maria Manuela M. Raposo. "Push-Pull Heterocyclic Dyes Based on Pyrrole and Thiophene: Synthesis and Evaluation of Their Optical, Redox and Photovoltaic Properties." Coatings 12, no. 1 (2021): 34. http://dx.doi.org/10.3390/coatings12010034.

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Three heterocyclic dyes were synthesized having in mind the changes in the photovoltaic, optical and redox properties by functionalization of 5-aryl-thieno[3,2-b]thiophene, 5-arylthiophene and bis-methylpyrrolylthiophene π-bridges with different donor, acceptor/anchoring groups. Knoevenagel condensation of the aldehyde precursors with 2-cyanoacetic acid was used to prepare the donor-acceptor functionalized heterocyclic molecules. These organic metal-free dyes are constituted by thieno[3,2-b]thiophene, arylthiophene, bis-methylpyrrolylthiophene, spacers and one or two cyanoacetic acid acceptor

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6

Bassam A. Hassan, Hameedi N Nasera, and Maitham M. Abdulridha. "Synthesis and antimicrobial evaluation of fused heterocyclic compound [1,2,4] triazolo [4,3-b][1,2,4,5] tetra zine." International Journal of Research in Pharmaceutical Sciences 10, no. 2 (2019): 1254–58. http://dx.doi.org/10.26452/ijrps.v10i2.417.

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Nitrogen-containing, heterocycles, have special importance and vital, role in the discovery of effective bioactive, agents in the pharmaceutical, industry. The present article reports the synthesis of new fused, heterocycles triazolotetrazine by cyclo condensation, reaction as shown in scheme(1). The structures formula of synthesized compounds newly was evaluated by Ft-IR,1H-NMR spectrum, and C, H, N elemental analysis. Antimicrobial activity of triazolotetrazine studied against some pathogenic bacterial strains isolated from patients like Acinetobacter, Aeromonas, E. coli, Klebsiella, Staphyl

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7

Kato, Terumasa, Shin-ichi Matsuoka, and Masato Suzuki. "N-Heterocyclic carbene-mediated redox condensation of alcohols." Chemical Communications 52, no. 55 (2016): 8569–72. http://dx.doi.org/10.1039/c6cc04154j.

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8

Halah Hameed Majeed and Abbas F. Abbas. "Synthesis ,Characterization and Antioxidant Activity of Schiff base derivatives from [6,6'-(1,4-phenylene)bis(4-(4-aminophenyl) pyrimidin)]." Journal of Kufa for Chemical Sciences 3, no. 1 (2023): 313–44. http://dx.doi.org/10.36329/jkcm/2023/v3.i1.12098.

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Two Hetreterocyclic compounds prepared from condensation reaction of Bis chalcone([3,3(1,4-phenylene)bis(1(4-aminophenyl)prop-2-en-1-one]with thiourea and urea By condensing a novel six-member heterocyclic (pyrimidene ring) with the suitable aromatic, new substituted azomethines of (o, m, and p) hydroxybenzaldehyde with heterocyclic substituents were created. By using NMR and FTIR spectroscopy, the novel heterocyclic compounds and these derivatives of schiff bases were identified.A DPPH free radical scavenging assay was performed on the synthesized compounds, and the heterocyclic substituted t

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9

Garmendia, Sofiem, Andrew P. Dove, Daniel Taton, and Rachel K. O'Reilly. "Self-catalysed folding of single chain nanoparticles (SCNPs) by NHC-mediated intramolecular benzoin condensation." Polymer Chemistry 10, no. 18 (2019): 2282–89. http://dx.doi.org/10.1039/c9py00149b.

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10

Gianotti, Enrica, Ivana Miletto, Chiara Ivaldi, et al. "Hybrid catalysts based on N-heterocyclic carbene anchored on hierarchical zeolites." RSC Advances 9, no. 61 (2019): 35336–44. http://dx.doi.org/10.1039/c9ra07516j.

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11

Rayala, Nagamani, Sumathi Vodnala, Supriya Kamsani, et al. "Acid Catalyzed Multicomponent One-Pot Synthesis of New Quinazolinone based Unsymmetrical C-N Linked Bis Heterocycles." Asian Journal of Chemistry 34, no. 2 (2022): 432–36. http://dx.doi.org/10.14233/ajchem.2022.23619.

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A novel series of unsymmetrical C-N linked bis heterocycles bearing quinazolinone and acridinedione skeletons have been synthesized in an acid promoted one pot multicomponent reaction. A blend of 6-aminoquinazolin-4-(3H)-one, aromatic aldehydes and cyclohexane-1,3-dione in a simple and efficient condensation-cyclization reaction using hydrochloric acid in catalytic amount as catalyst afforded unsymmetrical bis hybrids in good to excellent yields. Multiheterocyclic hybrid compounds were also synthesized using heterocyclic ring containing aldehyde in three component reaction. The synthesized qui

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12

Satyam, Killari, Jakkula Ramarao, and Surisetti Suresh. "N-Heterocyclic carbene (NHC)-catalyzed intramolecular benzoin condensation–oxidation." Organic & Biomolecular Chemistry 19, no. 7 (2021): 1488–92. http://dx.doi.org/10.1039/d0ob02606a.

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NHC-Catalyzed intramolecular benzoin condensation–oxidation has been disclosed for the expedient synthesis of diverse seven-membered heterocyclic 1,2-diketones in good to excellent yields, under ambient conditions.

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13

M, Heravi; Majid, and L. Mohammadkhani. "Synthesis of various N-heterocycles using the four-component Ugi reaction." Advances in Heterocyclic Chemistry 131 (May 14, 2019): 351–403. https://doi.org/10.1016/bs.aihch.2019.04.001.

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Nowadays, among synthetic organic chemists, the Ugi four-component reaction (U-4CR), is known as the most important and useful isocyanide-based multicomponent reactions (IMCRs); since it allows the rapid and straightforward synthesis of the linear peptide backbone. U-4CR, actually is the condensation reaction involving, an isocyanide, an aldehyde, an amine, and a carboxylic acid leading to the formation of the corresponding adduct. Significantly, this adduct can be cyclized through a suitable posttransformation, resulting in the construction of different heterocyclic systems containing nitroge

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14

Ibrahim, Mohamed N., Mohamed F. El-Messmary, and Mohamed G. A. Elarfi. "Synthesis of Spiro Heterocyclic Compounds." E-Journal of Chemistry 7, no. 1 (2010): 55–58. http://dx.doi.org/10.1155/2010/604549.

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Reaction of isatin with acetophenone derivatives gave 3-hydroxy-3-phenacyl oxindole derivatives(II), dehydration of(II)gave 3-phenacylidene-2-indolinone derivatives(III). Condensation of(III)with hydrazine hydrate, phenylhydrazine and phenylthiourea afforded new spiropyrazolines(IV & V)and spiropyrimidinethione(VI)respectively. The structures of the final products were established by physical and spectral means.

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15

Tuguldurova, Vera P., Alexander V. Fateev, Oleg Kh Poleshchuk, and Olga V. Vodyankina. "Theoretical analysis of glyoxal condensation with ammonia in aqueous solution." Physical Chemistry Chemical Physics 21, no. 18 (2019): 9326–34. http://dx.doi.org/10.1039/c8cp07270a.

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16

Chen, Lei, Zu Ming Hu, Bao Shan Gao, Guo Ping Tang, Jun Rong Yu, and Jing Zhu. "Flow Behavior of Heterocyclic Aramid Concentrated Solution." Advanced Materials Research 146-147 (October 2010): 470–74. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.470.

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By means of HAAKE RS105L cone and plate rheometer the rheological behavior of heterocyclic aramid concentrated solution, including viscous flow activation energy, non-Newtonian index, structural viscosity index of the heterocyclic aramid solution were studied. The effect of concentration and temperature of the solution and molecular weight of the polymer on its non-Newtonian behavior was investigated. The results showed that heterocyclic aramid concentrated solution prepared via low temperature condensation was non-Newtonian fluid. With the decrease of temperature, increase of solution concent

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17

Li, Zhewei, Qianyue Wang, Min Pu, Zuoyin Yang, and Ming Lei. "Theoretical Study on Nitrogenous Heterocyclic Assisted Aldimine Condensation." Acta Chimica Sinica 78, no. 5 (2020): 437. http://dx.doi.org/10.6023/a19110413.

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18

Joshi, Medha, Smita Jauhari, and K. R. Desai. "Studies on heterocyclic polyurea–epoxy resin condensation products." Research on Chemical Intermediates 38, no. 1 (2011): 269–81. http://dx.doi.org/10.1007/s11164-011-0346-3.

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19

Lee, Chang Kiu, Mi Soon Kim, Jin Soon Gong, and In-Sook Han Lee. "Benzoin condensation reactions of 5-membered heterocyclic compounds." Journal of Heterocyclic Chemistry 29, no. 1 (1992): 149–53. http://dx.doi.org/10.1002/jhet.5570290127.

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20

S. AL-Rawi, Muna, Huda A. Hassan, Dheefaf F. Hassan та Ismaeel Y. Majeed. "New Series of Substituted Heterocyclics Derived from α , β – Unsaturated Ketone and Their Cytotoxic Activity Tumor Cell Lines". Oriental Journal of Chemistry 34, № 6 (2018): 2826–31. http://dx.doi.org/10.13005/ojc/340620.

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The aldol condensation of 2-acetylnaphthalene with 9-anthracene carboxaldehyde afforded α, β-unsaturated keton (1) . New heterocyclic compounds containing: cyclohexenone[2], indazole[3], pyrimidinethion [4], thiazolo fused pyrimidine[5], isoxazoline[6], substituted pyrazoline[7]a-d and pyrimidinone[8] rings system were synthesized from α, β-unsaturated keton[1]. Cyclization of [1] with ethylacetoacetate gave the mentioned heterocycle cyclohexanone [2]. The cyclo condensation of [2] with hydrazine gave the new indazole derivative [3]. furthermore, the reation of [1]with thiourea gives thiopyrmi

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21

Patel, Geetika, and Subhash Banerjee. "Review on Synthesis of Bio-active Coumarin-fused Heterocyclic Molecules." Current Organic Chemistry 24, no. 22 (2020): 2566–87. http://dx.doi.org/10.2174/1385272824999200709125717.

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The literature survey reveals that the individual coumarin and heterocyclic molecules have biological and pharmaceutical activities. Moreover, integrated coumarinfused heterocyclic compounds have shown interesting biological and physiochemical properties and thus, designing and development of coumarin-fused heterocyclic molecules are of great interest in the field of synthetic organic chemistry. Several coumarin-fused heterocyclic molecules have been synthesized by using different strategies such as multistep method, one-pot multi-component protocol, coupling and condensation method. The wide

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22

Geetha, D., Y. B. Basavaraju, and K. Roopa. "Synthesis and Biological Evaluation of New Chalcone based Thiazole Derivatives: Antimicrobial, Antifungal Activity, ADME and Molecular Docking Studies." Asian Journal of Chemistry 37, no. 3 (2025): 593–600. https://doi.org/10.14233/ajchem.2025.33226.

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The Claisen-Schmidt condensation reaction of 2-acetyl thiophene with heterocyclic carboxaldehyde or substituted benzaldehyde in the presence of alkaline medium was used to synthesize novel thiophene chalcones. Several chalcone heterocycle hybrids appear to have more activity than the standards. These chalcones can be hydroaminated to provide good yields of amino thiazole derivatives. The newly synthesized compounds were characterized with spectroscopic techniques including FT-IR, 1H NMR, 13C NMR and HRMS. In addition to a seed germination inhibition test and an evaluation of the synthesized co

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23

Wang, Qijun, Jiahao Yan, Mingchao Xiao, et al. "One-step solution synthesis of a two-dimensional semiconducting covalent organometallic nanosheet via the condensation of boronic acid." RSC Advances 9, no. 50 (2019): 29327–30. http://dx.doi.org/10.1039/c9ra05806k.

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A 2D covalent organometallic nanosheet (COMS-Co) was synthesized through the one-step conjunction of sandwich coordinate motif with covalent heterocyclic linkage via the condensation of boronic acid, and it showed promising semiconducting properties.

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24

Prousek, Josef. "Synthesis of 5-Arylidene-2,4,6(1H,3H,5H)pyrimidinetrione Derivatives." Collection of Czechoslovak Chemical Communications 58, no. 12 (1993): 3014–16. http://dx.doi.org/10.1135/cccc19933014.

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From the synthetic viewpoint, barbituric acid and its derivatives serve in preparation of acrylidine condensation products. We have now synthesized new derivatives by reaction of barbituric acid with the corresponding heterocyclic aldehydes RCH=O in DMF.

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25

García-Báez, Efrén V., Itzia I. Padilla-Martínez, Feliciano Tamay-Cach, and Alejandro Cruz. "Benzothiazoles from Condensation of o-Aminothiophenoles with Carboxylic Acids and Their Derivatives: A Review." Molecules 26, no. 21 (2021): 6518. http://dx.doi.org/10.3390/molecules26216518.

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Nowadays, organic chemists are interested in the field of heterocyclic chemistry due to its use in the synthesis of a great variety of biologically active compounds. Heterocyclic compounds are widely found in nature and are essential for life. Among these, some natural nitrogen containing heterocyclic compounds have been used as chemotherapeutic agents. Their attachment to sugar molecules either as thioglycosides or as nucleosides analogues plays an important role in vital biological processes as well as in synthetic organic chemistry. Molecules containing benzothiazole (BT) nuclei are of this

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26

Phungpis, Baramee, and Viwat Hahnvajanawong. "1-Butyl-3-methylimidazolium Bromide as a Solvent and Precatalyst for Stetter Reaction." Asian Journal of Chemistry 32, no. 8 (2020): 2028–32. http://dx.doi.org/10.14233/ajchem.2020.22711.

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Stetter reaction between aromatic aldehydes and acrylonitrile/ethyl acrylate performing in [Bmim]Br in the presence of NaOH is described. N-Heterocyclic carbene (NHC) generates in situ is shown to be an efficient catalyst. Benzoin condensation also occured as side reaction.

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27

Mistry, Rakesh N., and K. R. Desai. "Studies on Synthesis of Some Novel Heterocyclic Azlactone Derivatives and Imidazolinone Derivatives and their Antimicrobial Activity." E-Journal of Chemistry 2, no. 1 (2005): 42–51. http://dx.doi.org/10.1155/2005/542938.

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p- Methyl benzoic acid on reaction with phosphorus pentachloride gives p - methyl benzoyl chloride derivative which on condensation with glycine gives p - methyl benzoyl glycine derivative. Now, this p - methyl benzoyl glycine derivative on condensation with various substituted aldehydes gives corresponding substituted 4 - [aryl methylidine] - 2 - [p - methyl phenyl] - oxazole - 5 - one derivatives [1(a-j)]. Further, these derivatives [1(a-j)] on condensation with 4 , 4’ - diamino diphenyl sulphone gives corresponding substituted imidazolinone - dibenzsulphone derivatives [2(a-j)], on condensa

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28

Badiger, Krishnappa B., and Kantharaju Kamanna. "Knoevenagel condensation reaction catalysed by agro-waste extract as a greener solvent catalyst." Organic Communications 14, no. 1 (2021): 81–91. http://dx.doi.org/10.25135/acg.oc.99.21.01.1948.

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This paper present a novel Knoevenagel reaction protocol for the condensation of aromatic/heteroaromatic aldehydes with malononitrile to give α, β–unsaturated benzylidene derivatives. The main focus of this work is to reveal the usability of agro-waste extracts as a catalyst in the Knoevenagel condensation. The present protocol proceeds efficiently for various substituted aromatic and heterocyclic aldehydes in the Knoevenagel reactions. In addition, the present method describes direct isolation of the formed products without using organic solvent extraction gave good yields product.

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29

Huang, XueLiang, and Song Ye. "Enantioselective benzoin condensation catalyzed by bifunctional N-heterocyclic carbenes." Chinese Science Bulletin 55, no. 17 (2010): 1753–57. http://dx.doi.org/10.1007/s11434-010-3122-7.

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30

Spiridonova, Yu S., I. A. Litvinov, E. I. Musina, and A. A. Karasik. "N,O-, N,N-, N,S- AND N,N,S-HETEROCYCLES WITH AN EXOCYCLIC AMINOGROUP IN THE SYNTHESIS OF 1,5,3,7-DIAZADIPHOSPHACYCLOOCTANES." Доклады Российской академии наук. Химия, науки о материалах 510, no. 1 (2023): 40–47. http://dx.doi.org/10.31857/s2686953522600386.

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New 1,5,3,7-diazadiphosphacyclooctanes with N,O-, N,N-, N,S- and N,N,S-heterocyclic substituents at nitrogen atoms were synthesized. The influence of amines containing sp2-hybridized nitrogen atom on the ortho-position of the heterocyclic substituent on the result of a Mannich condensation of primary phosphines, paraformaldehyde and primary amines is revealed. The stabilization of intermediate acyclic products – aminomethyl(hydroxymethyl)arylphosphines and bis(aminomethyl)arylphosphines due to amino-imine tautomerism is a reason of the low yield of cyclic diphosphines on the base of above ment

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31

Devendra, Kumar, and C. Sharma R. "Synthesis and antimicrobial activity of some new 4-thiazolidinones derived from heterocyclic Schiff bases." Journal of Indian Chemical Society Vol.79, Mar 2002 (2002): 284–85. https://doi.org/10.5281/zenodo.5849888.

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Department of Chemistry, Institute of Basic Sciences Dr. B. R. Ambedkar University, Khandari, Agra-282 002, India <em>E-mail</em> : rcsharma109@usa.net <em>Fax</em>: 91-562-352116 <em>Manuscript received 11 September 2000, revised 7 August 2001, accepted 17 August 2001</em> Ten new 4-thiazolidinones have been synthesized by condensation of heterocyclic Schiff bases (la-e) with thioglycolic acid and thiomalic acid. All the compounds have been screened for their antibacterial and antifungal activities.  

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32

Kumar, Nakul, Chhagan Lal, Bijendra Singh, and Angik K. Patel. "Synthesis and Biological Activities of Some Novel Spiro Heterocyclic Pyrrolizidine Derivatives of 11H-indeno[1,2-b]quinoxaline through 1,3-Dipolar Cycloaddition." Asian Journal of Chemistry 32, no. 5 (2020): 1255–58. http://dx.doi.org/10.14233/ajchem.2020.22630.

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The synthesis of spiropyrrolidines by the Knoevenagel condensation has been reported as highly bioactive natural and synthetic organic products. The synthesis was initiated by Knoevenagel condensation of indole-2-one with an appropriate benzaldehyde in presence of L-proline to afford spiropyrrolidines. Herein, a design and pathway of syntheses of a library of spiropyrrolidines bearing spiro heterocyclic indeno[1,2-b]quinoxaline-11-one motifs were reported, which also demonstrated an exceptional inhibitory activity against the anticancer cells. A novel series of dispiroindenoquinoxaline pyrroli

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33

Niu, Jiawei, Yuhui Wang, Shenghu Yan, et al. "One-pot Ugi-azide and Heck reactions for the synthesis of heterocyclic systems containing tetrazole and 1,2,3,4-tetrahydroisoquinoline." Beilstein Journal of Organic Chemistry 20 (April 23, 2024): 912–20. http://dx.doi.org/10.3762/bjoc.20.81.

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A new method for the synthesis of heterocyclic systems containing tetrazole and tetrahydroisoquinoline is developed via the performance of one-pot Ugi-azide and Heck cyclization reactions. The integration of the multicomponent and post-condensation reactions in one-pot maximizes the pot-, atom-, and step-economy (PASE).

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34

Li, Min-Xin, Xiao-Jia Pu, Xia Zhang, et al. "Synthesis and Biological Evaluation of Heterocyclic Substituted Bis(indolyl)methanes." Current Organic Synthesis 17, no. 2 (2020): 144–50. http://dx.doi.org/10.2174/1570179417666200124103400.

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Background: Bis(indolyl)methane derivatives are widely found in nature with a broad range of biological and pharmacological activities. The development of techniques for the synthesis and functionalization of bis(indolyl)methanes have attracted more and more attention in recent years. Objective: To study the synthesis and biological activity of heterocyclic substituted bis(indolyl)methanes. Materials and Methods: A series of heterocyclic substituted bis(indolyl)methanes (3a-3p) have been prepared by condensation reaction of indole and heterocyclic aldehydes catalyzed by boron trifluoride ether

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35

Vorbrüggen, H. "Some recent trends and progress in nucleoside synthesis." Acta Biochimica Polonica 43, no. 1 (1996): 25–36. http://dx.doi.org/10.18388/abp.1996_4514.

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Some recent progress concerning the optimal combinations of Lewis acids and solvents for the synthesis of pyrimidine as well as purine nucleosides is reviewed. Furthermore, the novel condensation of persilylated free sugars and heterocyclic bases in the presence of trimethylsilyl triflate to the corresponding persilylated nucleosides is discussed.

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36

Seo, Ue Ryung, and Young Keun Chung. "Poly(4-vinylimidazolium) iodides: a highly recyclable organocatalyst precursor for benzoin condensation reaction." RSC Adv. 4, no. 61 (2014): 32371–74. http://dx.doi.org/10.1039/c4ra05073h.

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The development of highly efficient, recyclable poly(4-vinylimidazolium) iodides (2) for the benzoin condensation reaction under mild reaction conditions is discussed: poly(4-vinylN-heterocyclic carbene)s (3) obtained from2showed a higher catalytic activity and could be successfully recovered and reused over seven times without loss of performance.

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37

Berini, Christophe, Thibaut Martin, Pierrik Lassalas, Francis Marsais, Christine Baudequin, and Christophe Hoarau. "Synthesis of the heterocyclic core of the D-series GE2270." Beilstein Journal of Organic Chemistry 13 (July 17, 2017): 1407–12. http://dx.doi.org/10.3762/bjoc.13.137.

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A straightforward enantiomerically pure synthesis of the heterocyclic core of the D-series GE2270 is reported. The synthetic strategy combines the Hantzsch thiazole’s building condensation with a cross-coupling reaction including direct C–H hetarylation to build and connect step-by-step thiazolyl moieties to the 5-bromopicolinate as readily available starting material.

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38

Heravi, Mohammad Reza Poor, Mahdis Danafar, and Niloofar Poor Heravi. "One-pot of Three-component Synthesis of Novel Biologically Important 5-Amino-1,3-diaryl-1H-pyrazole-4-carbonitriles Using L-Proline Catalyst and their Antimicrobial Activity." Letters in Organic Chemistry 16, no. 11 (2019): 922–30. http://dx.doi.org/10.2174/1570178616666190315155330.

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An expeditious three-component synthesis of various biologically important heterocyclic compounds 5-amino-1,3-diaryl-1H-pyrazole-4-carbonitriles by condensation of aryl aldehydes, malononitrile and phenylhydrazine derivatives is described. This greener protocol was catalyzed by L-Proline and proceeded efficiently in solvent at room temperature within 2-15 min.

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39

Dhivare, Ravindra S., and S. S. Rajput. "Malononitrile: A Versatile Active Methylene Group." International Letters of Chemistry, Physics and Astronomy 57 (August 2015): 126–44. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.57.126.

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The title role of malononitrile in the development of Knoevenagel condensation of organic synthesis and their new findings are explored in this review. The active methylene group of malononitriles is very important attacking part in the heterocyclic conversions and also having a great potency towards several microbial and biological systems.

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40

Dhivare, Ravindra S., and S. S. Rajput. "Malononitrile: A Versatile Active Methylene Group." International Letters of Chemistry, Physics and Astronomy 57 (August 4, 2015): 126–44. http://dx.doi.org/10.56431/p-5354je.

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The title role of malononitrile in the development of Knoevenagel condensation of organic synthesis and their new findings are explored in this review. The active methylene group of malononitriles is very important attacking part in the heterocyclic conversions and also having a great potency towards several microbial and biological systems.

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R., S. Dhivare, and S. Rajput S. "Malononitrile: A Versatile Active Methylene Group." International Letters of Chemistry, Physics and Astronomy 57 (August 4, 2015): 126–44. https://doi.org/10.18052/www.scipress.com/ilcpa.57.126.

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Abstract: The title role of malononitrile in the development of Knoevenagel condensation of organic synthesis and their new findings are explored in this review. The active methylene group of malononitriles is very important attacking part in the heterocyclic conversions and also having a great potency towards several microbial and biological systems.

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42

Yanovskaya, Ludmila A., Galya V. Kryshtal, Dalimil Dvořák, Vladimír Král, and Zdeněk Arnold. "Substituted methylenemalonaldehydes: Condensation of dialdehydes with 1,3-bis(dimethylamino)trimethinium perchlorate." Collection of Czechoslovak Chemical Communications 50, no. 10 (1985): 2270–74. http://dx.doi.org/10.1135/cccc19852270.

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Selected unsaturated, aromatic, and heterocyclic dialdehydes reacted with 1,3-bis(dimethylamino)trimethinium perchlorate in acetic anhydride in the presence of acid. One of the aldehyde group participated in the condensation, whereas the other was transformed into the diacetate. The obtained substituted methylenemalonaldehydes were characterized by their 1H NMR, IR, and mass spectra.

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Sweeney, Martin, Darren Conboy, Styliana I. Mirallai, and Fawaz Aldabbagh. "Advances in the Synthesis of Ring-Fused Benzimidazoles and Imidazobenzimidazoles." Molecules 26, no. 9 (2021): 2684. http://dx.doi.org/10.3390/molecules26092684.

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This review article provides a perspective on the synthesis of alicyclic and heterocyclic ring-fused benzimidazoles, imidazo[4,5-f]benzimidazoles, and imidazo[5,4-f]benzimidazoles. These heterocycles have a plethora of biological activities with the iminoquinone and quinone derivatives displaying potent bioreductive antitumor activity. Synthesis is categorized according to the cyclization reaction and mechanisms are detailed. Nitrobenzene reduction, cyclization of aryl amidines, lactams and isothiocyanates are described. Protocols include condensation, cross-dehydrogenative coupling with trans

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Thanh, Nguyen Dinh. "Synthesis of Peracetylatedβ-D-Glucopyranosyl Thioureas from Substituted 2-Aminobenzo-1ʹ, 3ʹ-thiazoles". E-Journal of Chemistry 9, № 1 (2012): 55–62. http://dx.doi.org/10.1155/2012/615601.

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Some peracetylated glucopyranosyl thioureas containing a heterocyclic ring system, benzo-1,3-thiazole have been prepared by the condensation reaction of tetra-O-acetyl-β-D-glucopyranosyl isothiocyanate and corresponding substituted 2-amino-(6-substituted)benzo-1,3-thiazoles. Investigated heating conditions showed that the solventless microwave-assisted method gave higher yields of these thioureas.

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M., A. EL·MAGHRABY, K. KHALAFALLA A., E. HASSAN M., and A. SOLBIMAN H. "Synthesis and Studies on Heterocyclic Nitrogen Compounds." Journal of Indian Chemical Society Vol. 63, Oct 1986 (1986): 910–13. https://doi.org/10.5281/zenodo.6298866.

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Chemistry Department, Aswan-Paoulty of Science, Aswan, Egypt <em>Manuscript received 17 December 1986, accepted 2 August 2986</em> Condensation of 1-phenyl-3-methylpyrazoline-5-one with 4-aminoacetophenonc gave a quantitative yield of 1-phenyl-3-methylpyrazolidene-p-acetylaniline (1). Condensation of 1 with aromatic aldehydes yielded the corresponding pyrazolideneazomethinechalcones (2a - f). Interaction of 2 with hydrazines, hydroxylamine, urea, and thiourea afforded a new pyrazolidene azomethine pyrazolines, isooxazoles, pyrimidine and pyrimidine thione derivatives, respectively.

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Bracher, Franz. "Dimethylformamide Acetals and Bredereck’s Reagent as Building Blocks in Natural Products Total Synthesis." Mini-Reviews in Organic Chemistry 17, no. 1 (2020): 47–66. http://dx.doi.org/10.2174/1570193x16666181204122143.

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Dimethylformamide acetals and Bredereck’s reagent (tert-butoxy-bis(dimethylamino) methane) are versatile C1 building blocks due to their ability to undergo condensation reactions with CH-acidic methyl and methylene moieties. Subsequent modulation of the resulting condensation products enables the preparation of open-chain products like aldehydes, ketones, enones, enol ethers, methyl groups, and, most important in alkaloid total synthesis, the annulation of heterocyclic rings like pyridines, pyridine-N-oxides, bromopyridines, aminopyridines, aminopyrimidines, pyrroles and chromenones. In certai

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Shaima Ibrahim Chyad Al-khazraji and Khalid M. Mohammed Al-janabi. "Synthesis and characterization heterocyclic of compounds derived fromamino pyridine substituted." Tikrit Journal of Pure Science 21, no. 2 (2023): 63–79. http://dx.doi.org/10.25130/tjps.v21i2.974.

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In this study, heterocyclic derivatives of imidazole, pyrimidine, benzodiazepine, indole and benzimidazole were synthesized. These new compounds were formed through the condensation reaction between 2-aminopyridinederivative with4-phenylphenacyl bromide, chloroacetic acid, malonic acid, phthalic acid, isatin and o-phenylenediamine respectively. All of these compounds synthesized produced of good yield percentage, The synthesized compounds structures were characterized by FTIR, 1H- and 13C-NMR spectroscopy

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Al-Shiekh, Mariam A., Hanady Y. Medrassi, Mohamed H. Elnagdi, and Ebtisam A. Hafez. "Substituted Hydrazonals as Building Blocks in Heterocyclic Synthesis: A New Route to Arylhydrazonocinnolines." Journal of Chemical Research 2007, no. 7 (2007): 432–36. http://dx.doi.org/10.3184/030823407x234617.

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2-heteroylhydrazonopropanals 2a–e and 3-oxo-2-arylhydrazonopropanals 2f–k were prepared via coupling of enaminones 1 with aromatic diazonium salts. Compounds 2a–c condensed with hydrazine hydrate to yield the corresponding hydrazones 3a–c which afford on cyclisation the cinnoline derivatives 6a–c, while condensation of 2g, j with hydrazine hydrate directly yielded the pyrazole derivatives 4g–j. Condensation of 2a–c, f, g with phenyl hydrazine gave the corresponding phenyl hydrazone derivatives 7a–c, f, g. Structures of 2a, h and 3a were assessed by single crystal X-ray analyses.

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Tian, Yuan, and Jeehiun K. Lee. "Gas Phase Studies of N-Heterocyclic Carbene-Catalyzed Condensation Reactions." Journal of Organic Chemistry 80, no. 13 (2015): 6831–38. http://dx.doi.org/10.1021/acs.joc.5b01069.

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LEE, C. K., M. S. KIM, J. S. GONG, and I. S. H. LEE. "ChemInform Abstract: Benzoin Condensation Reactions of 5-Membered Heterocyclic Compounds." ChemInform 23, no. 31 (2010): no. http://dx.doi.org/10.1002/chin.199231086.

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