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Journal articles on the topic 'Substituted Hydrazine'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Ananthi, Vadamalai, Kaliyaraj Rajalakshmi, Inbasekaran Muthuvel, and Ganesamoorthy Thirunarayanan. "Solid acidic FeCl3/Bentonite catalyzed solvent-free condensation: Synthesis, spectral studies and antimicrobial activities of some aryl hydrazine Schiff’s bases." Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia 71, no. 2 (2017): 127. http://dx.doi.org/10.17951/aa.2016.71.2.127.

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<p>Some aryl hydrazide derivatives have been synthesized including 1-(3-chloro-4-nitrophenyl)-2-(3-substituted benzylidene) hydrazines by FeCl<sub>3</sub>/Bentonite catalyzed solvent-free condensation of substituted phenyl hydrazine and aldehydes under microwave irradiation. The yields of the hydrazides are more than 70%. The synthesized hydrazides are characterized by the physical constants, micro analysis and spectroscopic data. Effect of catalyst, solvent effect substituent effect and optimization of the catalyst was studied by the percentage of isolated yields. From the c

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2

Geschwentner, Michael, Gernot Elter, and Anton Meller. "Supermesityl-substituierte Hydrazinoborane / Supermesityl-Substituted Hydrazinoboranes." Zeitschrift für Naturforschung B 49, no. 4 (1994): 459–64. http://dx.doi.org/10.1515/znb-1994-0405.

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Difluoro(supermesityl)borane reacts with monolithiated hydrazines to give the correspond ing fluoroborylated hydrazines 1a-c , which could not be dehydrofluorinated to yield definite products. From dilithiated hydrazine the 1,2-borylated species 2 was obtained. The fluoro-borylhydrazones 3a-3d prepared in an analogous way, by dehydrofluorination with tert-butyllithium, led to 5-, 6-and 7-membered boron nitrogen heterocycles depending upon the substituents of the hydrazones.

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3

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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4

Kaur, Aneet Kamal, Renu Bala, Poonam Kumari, Sumit Sood, and Karan Singh. "Microwave Assisted Vilsmeier-Haack Reaction on Substituted Cyclohexanone Hydrazones: Synthesis of Novel 4,5,6,7-Tetrahydroindazole Derivatives." Letters in Organic Chemistry 16, no. 3 (2019): 170–75. http://dx.doi.org/10.2174/1570178615666180917101637.

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Vilsmeier-Haack reaction is one of the most important chemical reactions used for formylation of electron-rich arens. Even though Vilsmeier-Haack reaction was studied on a wide variety of hydrazones of enolizable ketones, literature lacks the examples of the use of 4-substituted cyclohexanones as a substrate. The cyclization potential of hydrazones of cyclic keto compounds is still interested topic of investigation. In the present study, the reaction of various hydrazines with 4-substituted cyclohexanones was proceeded and the resulted hydrazones in crude form were treated with Vilsmeier- Haac

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5

Alheety, Nuaman. "Synthesis, Characterization and Antimicrobial Activity Study of Some New Substituted Benzoxazole Derivatives." Baghdad Science Journal 16, no. 3 (2019): 616. http://dx.doi.org/10.21123/bsj.2019.16.3.616.

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This research included the preparation of 2-mercaptobenzoxazole (N1) by the reaction of ortho-aminophenol with carbon disulfide in an alcoholic potassium hydroxide solution. The 2-mercapto benzoxazole (N1) was then treated with hydrazine to obtain the 2-hydrazino benzoxazole (N2). A number of hydrazones (N3-N5) were prepared through the reaction of N2 with different benzaldehydes. The compound (N6) was also prepared whereby the ring closing of hydrazone (N3) using chloroacetylchloride, while the compound (N7) was prepared by treating 2-hydrazino benzoxazole with acetylacetone. When the compoun

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6

Yehye, Wageeh, and Amit Nath. "Acid Hydrazide: A Potential Reagent for the Synthesis of Semicarbazones." Synthesis 50, no. 21 (2018): 4301–12. http://dx.doi.org/10.1055/s-0037-1609557.

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Complex semicarbazone derivatives were successfully synthesized from substituted semicarbazides in acidic ethanol upon heating in the presence of aldehyde. The reaction is functional group tolerant and chemoselective because no terminal hydrazine moiety is present in the substituted semicarbazides. Thus, functional groups such as esters and acetyls, which are prone to reaction with hydrazine, can also be used in this reaction because the terminal hydrazine moiety of the acid hydrazide was protected by aryl isocyanates in order to prepare substituted semicarbazides. In addition, neither of the

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7

Ienaşcu, Ioana, Alfa Lupea, Iuliana Popescu, Mirabela Pădure, and Alina Zamfir. "The synthesis and characterization of some novel 5-chloro-2-(substituted alkoxy)-N-phenylbenzamide derivatives." Journal of the Serbian Chemical Society 74, no. 8-9 (2009): 847–55. http://dx.doi.org/10.2298/jsc0909847i.

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To obtain biologically active compounds, the synthesis of some new derivatives with an o-hydroxybenzamide structure was performed. The ethyl esters 4-6 were obtained by the reaction of 5-chloro-2-hydroxy-N-phenylbenzamide and chloro-substituted acid ethyl esters 1-3 in ethyl methyl ketone. The obtained ethyl esters were condensed with hydrazine yielding the hydrazides 7-8. The hydrazones 11-14 were obtained by the reaction of the hydrazides and the chloro-substituted benzaldehydes 9-10. All the newly synthesized compounds were characterized by FTIR, 1H-NMR, 13C-NMR, MS and elemental analyses.

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8

Gera, Ankur, Chander Mohan, and Sandeep Arora. "Synthesis of Phthaloylglycyl Hydrazide Derivatives: Selective Protection of Phthalimide Group from Hydrazinolysis." Current Organic Synthesis 15, no. 6 (2018): 839–45. http://dx.doi.org/10.2174/1570179415666180601083256.

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Background: N-phthalimide amino acid hydrazide is a class of compounds that have the potential therapeutic use. In general, hydrazinolysis of N-substituted amino acid(s) ester removes the ester group and yields the corresponding hydrazide. However, in case if N-substitution group is phthalimide, phthalimide group is cleaved and not the ester group. The resulted compound, therefore, is amino acid ester rather than Nphthalimide amino acid hydrazide. The above class of compounds, because of susceptibility of phthalimide group to hydrazinolysis, has previously been synthesized by a lengthy three-s

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9

Le, Trong Duc, Ngoc Nam Pham, and Tien Cong Nguyen. "Preparation and Antibacterial Activity of Some New 4-(2-Heterylidenehydrazinyl)-7-chloroquinoline Derivatives." Journal of Chemistry 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/4301847.

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N-(4-Substituted phenyl)acetamides, which were prepared from acetic anhydride and p-substituted anilines, were utilized as precursors for reactions to Vilsmeier-Haack reagent to form 6-substituted-2-chloroquinoline-3-carbaldehydes 3a–c. Meanwhile, a similar reagent was applied to 1-[1-(4-substituted phenyl)ethylidene]-2-phenylhydrazines as substrates, which were synthesized from phenylhydrazine hydrochloride and p-substituted acetophenones, and 1,3-diarylpyrazole-4-carbaldehydes 3d–f were observed as a result. Reactions between the aldehydes 3a–f and 7-chloro-4-hydrazinylquinoline 2, obtained

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10

Avdeenko, A. P., S. A. Konovalova, I. Yu Yakymenko, V. M. Baumer, S. V. Shishkina, and V. V. Pirozhenko. "Interaction of 4-{[(tolyl(methane)sulphonyl)oxy]imino}cyclohexa-2,5-dien-1-ones with N-nucleophiles." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 1 (January 2021): 3–11. http://dx.doi.org/10.32434/0321-4095-2021-134-1-3-11.

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Hydrazones of 1,4-benzoquinone, which have a wide range of biological activities, can be synthesized in the reactions of 4-{[(arylsulfonyl)oxy]imino}cyclohexa-2,5-diene-1-ones or N-(4-oxocyclohexa-2,5-diene-1-ylidene)arylsulfonamides with N-substituted hydrazines. In this study, the reaction of 2,6-disubstituted 4-{[(tolyl(methane)sulfonyl)oxy]imino}cyclohexa-2,5-diene-1-ones with aroylhydrazides gave N'-(3,5-dialkyl-4-oxocyclohexa-2,5-diene-1-ylidene)aroylhydrazides, which can be obtained by cross-synthesis in the reaction of N-(3,5-dialkyl-4-oxocyclohexa-2,5-dien-1-ylidene)arylsulfonamides w

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11

Ienascu, Ioana M. c., Alfa X. Lupea, Iuliana M. Popescu, Stefan Th Tomas, and Alina D. Zamfir. "Synthesis and Characterization of Some New 2-Hydroxy-N-(3-Trifluoromethyl-Phenyl)-Benzamide Derivatives." Revista de Chimie 59, no. 1 (2008): 56–60. http://dx.doi.org/10.37358/rc.08.1.1707.

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In the reaction between 2-hydroxy-N-(3-trifluoromethyl-phenyl)-benzamide and chloro-acetic acid ethyl ester, [2-(3-trifluoromethyl-phenylcarbamoyl)-phenoxy]-acetic acid ethyl ester was obtained. The ethyl ester was condensed with hydrazine giving 2-hydrazinocarbonylmethoxy-N-(3-trifluoromethyl-phenyl)-benzamide. This hydrazide is considered the key intermediate for the synthesis of new compounds. So, in the reaction between hydrazide and chloro-substituted benzaldehydes hydrazones were obtained. In order to establish their structures, all new synthesized compounds were analyzed by modern physi

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12

Elshaarawy, Reda F. M., and Christoph Janiak. "2-Thiophenecarbohydrazides: A Novel Efficient Method for the Synthesis of 2-Thiophenecarbohydrazide." Zeitschrift für Naturforschung B 66, no. 12 (2011): 1202–8. http://dx.doi.org/10.1515/znb-2011-1202.

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Hydrazinolysis of carboxylic acid esters in alcoholic solutions is the standard method for preparing carbohydrazides (carboxylic hydrazides). Here we report an efficient process, involving the reaction of activated esters or amides with hydrazine, for the preparation of thiophenecarbohydrazides in yields larger than 90% and high purity. With this new method, a series of heteroaryl-, aryl-, or aralkyl- substituted carbohydrazides were synthesized and characterized. The X-ray crystal structure of 2-thiophenecarbohydrazide (thiophene-2-carboxylic hydrazide, 2-thenoyl-hydrazine) has revealed that

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13

Jankowiak, Aleksandra, and Piotr Kaszyński. "Synthesis of oleophilic electron-rich phenylhydrazines." Beilstein Journal of Organic Chemistry 8 (February 20, 2012): 275–82. http://dx.doi.org/10.3762/bjoc.8.29.

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Phenylhydrazines 1 substituted with two or three long-chain alkyl, alkoxy or alkylsulfanyl groups were successfully prepared by acid-induced removal of the Boc group in hydrazides 2. The reaction is carried out with 5 equivalents of TfOH in CF3CH2OH/CH2Cl2 at −40 °C for 1.5 min. Under these conditions, the deprotected hydrazine 1 is fully protonated, which increases its stability in the reaction medium. The hydrazines were isolated in 60–86% yields and purities >90%. The hydrazides 2 were obtained in 43–71% yields from aryl bromides 5, which were lithiated with t-BuLi and subsequently react

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14

Heaton, Brian T., Chacko Jacob, and Philip Page. "Transition metal complexes containing hydrazine and substituted hydrazines." Coordination Chemistry Reviews 154 (September 1996): 193–229. http://dx.doi.org/10.1016/0010-8545(96)01285-4.

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15

Wang, Xiaoxia, Hongping Yu, Peifang Xu, and Renwei Zheng. "A Facile Synthesis of Acylhydrazines from Acylbenzotriazoles." Journal of Chemical Research 2005, no. 9 (2005): 595–97. http://dx.doi.org/10.3184/030823405774308781.

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Acylbenzotriazoles were found to react with substituted hydrazines and aqueous hydrazine under very mild conditions, thus affording a facile synthesis of three types of acylhydrazines in moderate to excellent yields.

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16

Abdelmohsen, Shawkat A., and Talaat I. El Emary. "SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF NOVEL PYRAZOLO[3,4-b]PYRIDINES AND THEIR SPIRO-HETEROCYCLIC DERIVATIVES." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 7 (2014): 2901–15. http://dx.doi.org/10.24297/jac.v10i7.6802.

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The present work describes the synthesis of a novel series of heterocyclic moieties derived from 5-acetylpyrazolo[3,4-b]pyridine (1). The formation of chalcones (2a-d) was utilized to synthesize pyrazoline, isoxazoline and pyrimidine derivatives (3-10). Thiosemicarbazone and semicarbazone (11, 17) were utilized to synthesize other new triazolethiones, thiadiazole and selenadiazole derivatives (11-19). Some new spiro derivatives (22-25) were synthesized by the reaction of chalcone (21) of 1 and isatine with hydrazines, hydroxyl amines and thiourea. Also, The reaction of 1 with cyanoacetyl hydra

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17

Dammene Debbih, Ouafa, Assia Sid, Rafika Bouchene, Sofiane Bouacida, Wissam Mazouz, and Noureddine Gherraf. "Two hydrazones derived from 1-aryl-3-(p-substituted phenyl)prop-2-en-1-one: synthesis, crystal structure, Hirshfeld surface analysis andin vitrobiological properties." Acta Crystallographica Section C Structural Chemistry 74, no. 6 (2018): 703–14. http://dx.doi.org/10.1107/s2053229618006812.

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Two chalcones were synthesized by the aldolic condensation of enolizable aromatic ketones with substituted benzaldehydes under Claisen–Schmidt reaction conditions and then treated with 2,4-dinitrophenylhydrazine to yield their corresponding hydrazones. The two (E,Z)-2,4-dinitrophenylhydrazone structures, namely (Z)-1-(2,4-dinitrophenyl)-2-[(E)-3-(4-methylphenyl)-1-phenylallylidene]hydrazine, C22H18N4O4, (H1), and (Z)-1-[(E)-3-(4-chlorophenyl)-1-(naphthalen-1-yl)allylidene]-2-(2,4-dinitrophenyl)hydrazine, C25H17ClN4O4, (H2), were isolated by recrystallization and characterized by FT–IR, UV–Vis,

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18

GOKLANI, POONAM, and ANIL GUPTA. "Synthesis, Structural Characterization and Study of Biological Activity of Hydrazine Derivatives." Material Science Research India 14, no. 2 (2017): 190–93. http://dx.doi.org/10.13005/msri/140217.

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Hydrazide-hydrazone derivatives play vital role in development of various pharmacological activities such as anti-tubercular, antiproliferative and antitumor activities. Some novel biologically active Hydrazide derivatives substituted with heterocyclic moiety have been synthesized. All the synthesized compounds structures were confirmed by IR, NMR and Mass spectra. Synthesized compounds were subjected to antibacterial screening in vitro and biological activity in vivo.

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19

Journal, Baghdad Science. "Synthesis and Characterization of 3 - Substituted Coumarin." Baghdad Science Journal 13, no. 1 (2016): 89–96. http://dx.doi.org/10.21123/bsj.13.1.89-96.

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The reaction of(2-oxo-2H-chromen-3-Carbonyl chloride)(k1) with hydrazine in boiling ethanol gives the hydrazide(K2).When compound (k2) reacts with various aromatic aldehydes ,the corres ponding Schiff bases(k3–k4) achieve new series of thiazotidines (k5–k6) and azetidinones (k7–k8) obtained from the reactions of appropriate Schiff bases with mercapto acetic acid and chloro acetyl chloride respectively. All the compounds are characterized by FT-IR,1H-NMR and GC-Ms.

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20

Journal, Baghdad Science. "Synthesis of New N-Substituted Phenoxazine Derivatives." Baghdad Science Journal 13, no. 2 (2016): 360–65. http://dx.doi.org/10.21123/bsj.13.2.360-365.

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This work comprises the synthesis of new phenoxazine derivatives containing N-substituted phenoxazine starting from phenoxazine (1). Synthesis of ethyl acetate phenoxazine (2) through the reaction of phenoxazine with ethylchloroacetate, which reacted with hydrazine hydrate to give 10-aceto hydrazide phenoxazine (3), then reacted with formic acid to give 10-[N-formyl acetohydrazide] phenoxazine (4). Reaction of compound (4) with phosphorous pentaoxide or phosphorus pentasulphide to gave 10-[N-methylene-1,3,4-oxadiazole] phenoxazine (5) and 10-[N-methylene-1,3,4-thiadiazole] phenoxazine (6).

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21

HEATON, B. T., C. JACOB, and P. PAGE. "ChemInform Abstract: Transition-Metal Complexes Containing Hydrazine and Substituted Hydrazines." ChemInform 27, no. 52 (2010): no. http://dx.doi.org/10.1002/chin.199652323.

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22

Sarma, K. Narasimha, M. C. S. Subha, and K. Chowdoji Rao. "A Facial Synthesis and Antimicrobial Activity of Some Pyrazole Derivatives Carrying Indole." E-Journal of Chemistry 7, no. 3 (2010): 745–50. http://dx.doi.org/10.1155/2010/979401.

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The title compounds (7a-h) were prepared by esterification of indole-5-carboxylic acid (1) and subsequent treatment with hydrazine hydrate in methanolviathe hydrazide (3). Finally hydrazide (3) condensed with different substituted aldol (6) in acetic acid / PTSA catalytic media produced (3,5-subsituted-4,5-dihydropyrazol-1-yl)(1H-indol-5-yl)methanone (7a-h) in good yields. All the newly synthesized compounds are by elemental analysis and spectral studies and evaluated for antimicrobial activities.

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23

Bhandarkar, Subodh, and Bhavana Khobragade. "Synthesis and Biological Study of 2-( 5-aryl-4,5-dihydro-1-substituted-pyrazol-3-yl )-Substituted-Naphthalene-1-Ol." Advanced Materials Research 1110 (June 2015): 306–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1110.306.

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The literature survey reveals that pyrazoline derivatives have been studied extensively because of their ready accessibility, diverse chemical reactivity, broad spectrum of biological activity and variety of Industrial applications. Pyrazolines with sulphonamidoaryl substituent at 3-position show cerebroprotective, antidepressant activity , anti-implantation activity, hypoglycemic activity. Due to this vital biological roll of pyrazoline derivatives it was thought to synthesized titled pyrazolines. 2-Acetyl-1-naphthol is prepared by Modified Nenchi’s method which on treatment with furfuraldehy

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24

Shainova, Roza S., Tiruhi A. Gomktsyan, Armen V. Karapetyan, and Aleksandr P. Yengoyan. "Synthesis and biological evaluation of 3-O-substituted 1-benzyl-6-oxo-1,6-dihydropyridazine derivatives." Journal of Chemical Research 43, no. 9-10 (2019): 352–58. http://dx.doi.org/10.1177/1747519819866402.

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On the basis of 2-benzyl-6-hydroxypyridazin-3(2 H)-one, a series of its novel O-substituted (including 6-(1,3,5-triazin-2-yl)oxy) derivatives is prepared. It is proven that the substitution reactions in the initial compound occur mainly at the oxygen atom of the hydroxy group. On the basis of the obtained oxy-aceto(propane)hydrazides, the corresponding azides and anilides are synthesized. A series of 2-[(1-benzyl-6-oxo-1,6-dihydropyridazin-3-yl)oxy]- N′-(substituted benzylidene)aceto(propane)hydrazides is obtained via the reaction of various aromatic aldehydes with the same hydrazides. Heteroc

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25

Tauchman, Jiří, Jakub Trnka, Ivana Císařová, and Petr Štěpnička. "Synthesis, crystal structures and electrochemistry of ferrocenyl-substituted 1,3,4-oxadiazoles." Collection of Czechoslovak Chemical Communications 75, no. 10 (2010): 1023–40. http://dx.doi.org/10.1135/cccc2010064.

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Two ferrocenyl-substituted 1,3,4-oxadiazoles, 2-ferrocenyl-1,3,4-oxadiazole (1) and 2,5-diferrocenyl-1,3,4-oxadiazole (2), have been prepared from the corresponding hydrazides, (ferrocenecarbonyl)hydrazine (3) and 1,2-bis(ferrocenecarbonyl)hydrazine (4), and characterized by conventional spectroscopic methods (IR, NMR, MS) and elemental analyses. The solid-state structures of 1, 2 and 4 have been determined by single-crystal X-ray diffraction analysis. The redox behavior of 1 and 2 was studied by electrochemical methods. Compound 1 underwent a reversible one-electron oxidation attributed to th

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26

Abdel Hafez, Ali A., Raga A. Ahmed, Ahmed A. Geies, and Hussein S. El-Kashef. "Synthesis and Some Reactions of Thieno[2,3-d]pyrimidines and S-Substituted Mercaptopyridines." Collection of Czechoslovak Chemical Communications 58, no. 8 (1993): 1931–36. http://dx.doi.org/10.1135/cccc19931931.

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Ethyl 3-cyano-4,6-diphenyl-2-pyridylthioacetate (II) yielded with hydrazine hydrate hydrazides III, IV that both proved to be versatile compounds for the synthesis of new heterocyclic derivatives. Thus the thieno[2,3-bpyridine derivatives Xa - Xd and XIIa - XIId were obtained.

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27

Sarma, Jayanta, Gurvinder Singh, Mukta Gupta, Reena Gupta, and Bhupinder Kapoor. "SYNTHESIS, CHARACTERIZATION AND IN VITRO ANTIMICROBIAL EVALUATION OF SOME NOVEL BENZIMIDAZOLE DERIVATIVES BEARING HYDRAZONE MOIETY." Asian Journal of Pharmaceutical and Clinical Research 10, no. 16 (2017): 1. http://dx.doi.org/10.22159/ajpcr.2017.v10s4.21328.

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Objective: The synthesis of novel benzimidazole-hydrazone derivatives has been carried out based on the previous findings that both these pharmacophores possess potent antimicrobial activities. The antibacterial properties of synthesized derivatives were screened against both Gram-positive and Gram-negative bacteria.Methods: O-phenylenediamine on condensation with substituted aromatic acids in polyphosphoric acid gave benzimidazole nucleus which on reaction with ethyl chloroacetate and hydrazine hydrate in two different steps resulted in the formation of substituted acetohydrazides. The target

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28

Ibrahim, Hassan K., Sayed H. El-Tamany, Reda F. El-Shaarawy, and Ibrahim M. El-Deen. "Synthesis and investigation of mass spectra of some novel benzimidazole derivatives." Macedonian Journal of Chemistry and Chemical Engineering 27, no. 1 (2008): 65. http://dx.doi.org/10.20450/mjcce.2008.248.

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2-Substituted benzimidazoles (3) and (4a-c) were prepared via condensation of ethyl 2-thionyl-pyruvate (1) and hydrazidoyl derivatives (2a-c) with o-phenylene diamine in acetic acid. Acetylation of compound (4a) with acetic anhydride yielded the corresponding N-acetyl derivative (5). Treatment of compound 4b with hydrazine hydrate gave the corresponding hydrazino derivative (6). Reaction of 2-[(2-thionyl)acetyl)] benzimidazole (3) with hydrazine hydrate gave the pyrazolyl derivative (7) and hydrazino derivative (8). Alkylation of compound 3 with alkyl halide gave the corresponding 2,3-disubsti

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29

Lupea, Xenia, Iuliana Popescu, Corneliu Tarabasanu, Ioana Ienascu, and Valentin Badea. "The synthesis and characterization of some ortho-substituted phenoxyalkanoic acids and their derivatives." Journal of the Serbian Chemical Society 71, no. 12 (2006): 1247–61. http://dx.doi.org/10.2298/jsc0612247l.

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The synthesis of 2-phenoxyalkanoic acids (ethanoic, propanoic, butanoic) was realized by the reaction of ortho-hydroxybenzamide respectively N-phenyl-o-hydroxybenzamide with ?-halogenated acids in aqueous sodium hydroxide solution. 2-[o-(carbamoyl)phenoxy]-2-methyl- and 2-[o-(phenylcarbamoyl)phenoxy]-2-methyl- propanoic acids were obtained by reaction of the appropriate amide with acetone, chloroform and sodium hydroxide. Ethyl esters of 2-phenoxyalkanoic acids were obtained by the reaction of the amide with ethyl esters of ?-halogenated acids in different reaction media. Starting from the eth

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30

Qiu, Xiao Yang, An Ran Shi, and Xiao Li Zhang. "Synthesis and Cytotoxic Activity of Salicyloyl Hydrazone Derivatives." Applied Mechanics and Materials 320 (May 2013): 522–25. http://dx.doi.org/10.4028/www.scientific.net/amm.320.522.

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Three salicyloyl hydrazone derivatives (compounds 1-3) were prepared by reacting salicyloyl hydrazine with substituted formaldehydes. Their structures were characterized by melting point, 1H-NMR, ESI-MS and elemental analyses. The cytotoxic activity of compounds 1-3 was evaluated in vitro against Hela cells (human cervical cancer cells). The results revealed that all the compounds showed cytotoxic activity, with IC50 values lower than 15 μM.

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31

Krutošíková, Alžbeta, Miloslava Dandárová, and Vladimír Bobošík. "Derivatives of Furo[3,2-b]pyrrole." Collection of Czechoslovak Chemical Communications 59, no. 2 (1994): 473–81. http://dx.doi.org/10.1135/cccc19940473.

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A number of methyl 2-substituted, 2,3-disubstituted-4H-furo[3,2-b]pyrrole-5-carboxylates (V - VII) and methyl 1H-benzo[b]furo[3,2-b]pyrrole-2-carboxylate (VIII) was prepared by the thermolysis of corresponding methyl 2-azido-3-(R1,R2-substituted-2-furyl)propenoates (I - IV). N-Methyl and N-benzyl derivatives IX - XVI were prepared at the phase-transfer catalysis conditions. Hydrolysis of some N-methyl and N-benzyl substituted esters furnished corresponding acids XVII - XXII. The hydrazides XXIII - XXX were obtained from corresponding esters and hydrazine hydrate. The preparation of 1-benzylben

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32

Gajdoš, Peter, Soňa Pavlíková, Filip Bureš, and Alžbeta Krutošíková. "2-[3-(Trifluoromethyl)phenyl]furo[3,2-b]pyrroles: synthesis and reactions." Open Chemistry 3, no. 2 (2005): 311–25. http://dx.doi.org/10.2478/bf02475999.

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AbstractThe synthesis and reactions of methyl 2-[3-(trifluoromethyl)phenyl]-4H-furo[3,2-b]pyrrole-5-carboxylate (1a) are described. Upon reaction with methyl iodide, benzyl chloride, or acetic anhydride, this compound gave N-substituted products 1b-d. By hydrolysis of compounds 1a-c, the corresponding acids 2a-c were formed, or by reaction with hydrazine-hydrate, the corresponding carbohydrazides 3a-c were formed. By heating 2-[3-(trifluoromethyl)phenly]-4H-furo[3,2-b]pyrrole-5-carboxylic acid (2a) in acetic anhydride, 4-acetyl-2-[3-(trifluoromethyl)phenyl]furo[3,2-b]pyrrole (4) was formed. By

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33

Chirkova, Zhanna V., Sergey I. Filimonov, and Igor G. Abramov. "SYNTHESIS OF BENZOFURAN-5,6-DICARBONITRILES ANNELATED WITH PYRAZOLE CYCLE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 60, no. 6 (2017): 45. http://dx.doi.org/10.6060/tcct.2017606.5576.

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The principal method for the preparation of substituted 4-formyl-1H-pyrazoles was the treatment of hydrazones of different structure with Vilsmeier-Haack reagent. However, for the heterocyclic benzofuran system this reaction is rarely used. Synthetic methods for preparation of novel substituted 3-(4-fomyl-1H-pyrazole-3-yl)-2-methylbenzofuran-5,6-dicarbonitriles and 2-(1H-pyrazole-4-yl)-benzofuran-5,6-dicarbonitriles were developed by modification of 2,3-disubstituted benzofuran-5,6-dicarbonitriles via Vilsmeier-Haack reaction. New substituted 3-(4-fomyl-1H-pyrazole-3-yl)-2-methylbenzofuran-5,6

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34

J Khairnar, Bhikan, Rahul S. Salunke, Premchand B. Patil, et al. "Synthesis and Antimicrobial Activity of Some New 1, 4-Benzothiazine Containing Thiosemicarbazides and 1, 3, 4-Oxadiazole Derivatives." E-Journal of Chemistry 9, no. 1 (2012): 318–22. http://dx.doi.org/10.1155/2012/902784.

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A series of novel 3- methyl-7-substituted-4H,4-benzothiazine-2-carbohydrazide (3a-e) and corresponding thiosemicarbazides (4-a-q); 2-[3-methyl-7-substituted- 4H-1, 4-benzothiazine-2-yl]-N-(aryl) hydrazine carbothiamide have been synthesized. The thiosemicarbazide when cyclized with iodine via intramolecular cyclisation gave benzothiazonyl oxadiazoles (5-a-q); 5-(3-methyl -7-substitued-4H- 1,4-benzothiazin-2-yl)-N—aryl- 1,3,4- oxadiazol -2-amine and the compounds were tested for antibacterial and antifungal activities against different microorganisms.

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35

Hemdan, Magdy M. "Addition–cyclisation of 3-(2-thienyl)acryloyl isothiocyanate with hydrazine derivatives as a source of triazoles and thiadiazoles." Journal of Chemical Research 2009, no. 8 (2009): 489–91. http://dx.doi.org/10.3184/030823409x12474221035136.

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3-(2-Thienyl)acryloyl isothiocyanate reacts additively with hydrazine hydrate, phenylhydrazine, 2-pyridyl hydrazine, (thio) semicarbazides, as well as benzoyl- and ethoxycarbonyl hydrazine. Simultaneous or subsequent cyclisation of the resulting 1:1 adducts in acidic or alkaline media yields substituted 1,3,4-thiadiazoles or 1,2,4-triazoles respectively.

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36

Rey, Marine, and Stéphane Beaumont. "Molybdenum-Mediated One-Pot Synthesis of Pyrazoles from Isoxazoles." Synthesis 51, no. 20 (2019): 3796–804. http://dx.doi.org/10.1055/s-0039-1690615.

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A one-pot approach for the direct synthesis of substituted pyrazoles from isoxazoles is reported. The process involves isoxazole N–O bond cleavage mediated by a molybdenum complex, in situ hydrolysis of the resulting β-amino enone to the corresponding 1,3-diketone, followed by pyrazole formation in the presence of hydrazine or substituted hydrazine. Good to excellent yields and regioselectivities are obtained with nonsymmetric isoxazoles. By using readily available starting materials, a wide range of substituted pyrazoles may be synthesized by this method.

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37

Potikha, Lyudmyla. "Peculiarities of the reactions of a,b-unsaturated g-bromoketones with hydrazine derivatives." French-Ukrainian Journal of Chemistry 6, no. 1 (2018): 56–66. http://dx.doi.org/10.17721/fujcv6i1p56-66.

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The reaction result of a,b-unsaturated g-bromoketones with hydrazines depends on the structure of the reagents. Reaction with hydrazine hydrate leads to the mixture of 3,5- di(R)pyridazine, 3,6-di(R)pyridazine and 2,4-di(R)-1H-pyrrol-1-amine derivatives. The formation of three types of products is due to the structure of the unsaturated aliphatic ketone. Two competing reaction schemes of ketones with hydrazines are considered, which include condensation or Michael-type addition in the first stage. The main products of the reactions of halogen-substituted derivatives of g-bromodipnone with aryl

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38

Sankarapapavinasam, S., F. Pushpanaden, and M. F. Ahmed. "Hydrazine and substituted hydrazines as corrosion inhibitors for lead in acetic acid." British Corrosion Journal 24, no. 1 (1989): 39–42. http://dx.doi.org/10.1179/000705989798270351.

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39

Awad, Ibrahim M. A., Abdu E. Abdel-Rahman, and Etify A. Bakhite. "Synthesis and application of some new S-(substituted)thio- and thienoquinoline derivatives as antimicrobial agents." Collection of Czechoslovak Chemical Communications 56, no. 8 (1991): 1749–60. http://dx.doi.org/10.1135/cccc19911749.

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Ethyl (4-aryl-3-cyano-5,6,7,8-tetrahydro-2-quinolinylthio) acetate (IIa, IIb) were prepared and reacted with hydrazine hydrate to give hydrazines IIIa, IIIb which underwent cyclization into thienoquinoline derivatives IVa, IVb. Reaction of IIIa, IIIb with phenyl isocyanate yielded semicarbazides Va, Vb. Similarly, IIIa, IIIb and IVb were interacted with methyl/phenyl isothiocyanates affording the corresponding thiosemicarbazide derivatives VIa - VId and XIVa, XIVb respectively. On the other hand, condensation of IIIb with acetylacetone gave the pyrazole VII treatment with ethoxide furnished VI

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40

Martin, Alex. "Synthesis, Characterization and Screening of Anti-tubercular activity of 2, 5-Disubstituted-1, 3, 4-Oxadiazole." Indian Journal of Pharmaceutical and Biological Research 1, no. 03 (2013): 12–19. http://dx.doi.org/10.30750/ijpbr.1.3.3.

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The synthesis of 2-furyl-5-(substituted)-1,3,4-oxadiazoles was carried out by microwave irradiation of 2-furoic acid and ethanol followed by subsequent hydrazinolysis with hydrazine hydrate. Finally furan-2-acid hydrazide was treated with appropriate carboxylic acid in the presence of phosphorous oxychloride to produce title compounds. The structures of the newly synthesized compounds were established on the basis of spectral analysis such as IR, H1NMR and Mass spectral data. The synthesized compounds were screened for their anti-tubercular activity.

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41

Saaid, Faiq H., Shatha J. Dawood, and Bushra H. Marbeen. "Synthesis and Characterization of 1,3,4- oxadiazole Derivatives using an Ultrasonic Technique." Al-Mustansiriyah Journal of Science 29, no. 2 (2018): 101. http://dx.doi.org/10.23851/mjs.v29i2.183.

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In the present study, a new of 1,3,4-oxadizole derivatives(4a1,4a2,4b1,4b2) were synthesized using an ultrasonic technique. Benzohydrazine and its substituted (2a, 2b) were obtained from the reaction of hydrazin with benzoylchloride and its substituted (1a, 1b). Compounds (2a, 2b) react with chloroacetic acid to form compounds (3a,3b) which react with p-phenylene diamine and hydrazine in presence of DMSO as a solvent to obtain new compounds (4a1,4a2, 4b1,4b2) by ultrasonic technique. The structures of the synthesized compounds were elucidated by spectral data: infrared spectra (FT-IR) an

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42

Ewes, Wafaa A., Sahar M. I. Badr, Hassan M. Eisa, and Magda N. A. Nasr. "Molecular modeling and synthesis of new 1,5-diphenylpyrazoles as breast cancer cell growth inhibitors." Heterocyclic Communications 21, no. 6 (2015): 367–75. http://dx.doi.org/10.1515/hc-2015-0156.

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AbstractNew pyrazoles have been synthesized and evaluated as breast cancer cell growth inhibitors. Condensation of the substituted pyrazole-4-carbaldehyde1with acetophenone and chloroacetophenone afforded α, β-unsaturated ketones2and3, respectively. Compounds2and3were subjected to different reactions using hydrazine hydrate, substituted hydrazine hydrate, hydroxylamine,o-phenylenediamine, malononitrile under different conditions affording 4-substituted pyrazole derivatives4–28. Structure elucidation of these compounds was conducted using IR,1H NMR,13C NMR, mass spectral data and elemental anal

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43

Raut, Santosh, Bharat Dhotre, Atul Tidke, and Mohammad Arif Pathan. "An Operationally Simple and Efficient Synthesis of 7-Benzylidene-substitutedphenyl- 3,3a,4,5,6,7-hexahydro-2H-indazole by Grinding Method." Current Organic Synthesis 17, no. 4 (2020): 313–21. http://dx.doi.org/10.2174/1570179417666200406142118.

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Background: An eco-friendly, operationally simple and efficient reaction is shown between various 2,6-bis-(substituted-benzylidene)-cyclohexanones and differently substituted hydrazine in the presence of acetic acid. Methods: The reaction between various 2,6-bis-(substituted-benzylidene)-cyclohexanones and differently substituted hydrazine in the presence of acetic acid afforded 7-Benzylidene-substituted-phenyl-3,3a,4,5,6,7- hexahydro-2H-indazole in 74 to 92 % yield in short reaction time using the grindstone technique. Results and Discussion: The notable advantages of this method include mild

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44

Kapase, Valmik S. "Microwave Assisted Synthesis and QSAR Study of 1-Substituted-3-aryl-1H-pyrazole-4-carbaldehydes Derivatives." Asian Journal of Organic & Medicinal Chemistry 6, no. 2 (2021): 79–83. http://dx.doi.org/10.14233/ajomc.2021.ajomc-p315.

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Several 1-substituted-3-aryl-1H-pyrazole-4-carbaldehyde (3a-g) derivatives were synthesized by substituted acetophenone (1a-d), substituted hydrazine (2a-b) and DMF in POCl3 and reaction mixture was irradiated with microwave at 20% power to furnish 1-substituted-3-aryl-1H-pyrazole-4-carbaldehydes derivatives (3a-g).

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45

Kurosu, Michio, Prabagaran Narayanasamy, and Dean C. Crick. "High-Throughput Synthesis of Substituted Hydrazine Derivatives." HETEROCYCLES 73, no. 1 (2007): 169. http://dx.doi.org/10.3987/com-07-s(u)14.

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46

Bag, Santanu, Oki Gunawan, Tayfun Gokmen, Yu Zhu, and David B. Mitzi. "Hydrazine-Processed Ge-Substituted CZTSe Solar Cells." Chemistry of Materials 24, no. 23 (2012): 4588–93. http://dx.doi.org/10.1021/cm302881g.

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47

Devi, K. Shashikala, M. Ramaiah, D. L. Roopa, and V. P. Vaidya. "Synthesis and Investigation of Antimicrobial and Antioxidant Activity of 3-Nitro-N- (3-chloro-2-oxo-substituted-phenyl-azetidin-1-yl)naphtho [2,1-b]furan-2-carboxamides." E-Journal of Chemistry 7, s1 (2010): S358—S362. http://dx.doi.org/10.1155/2010/863547.

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Ethyl-3-nitronaphtho[2,1-b]furan-2-carboxylate(2)has been synthesized from ethyl naphtha [2,1-b]furan-2-carboxylate(1). This nitro product on reaction with hydrazine hydrate formed 3-nitronaphtho [2,1-b] furan-2-carbohydrazide(3). Various Schiff bases 3-nitro-N1(aryl-methylene)-substituted-naphtho [2,1-b]furan-2-carbohydrazides4(a-g)were obtained by treating hydrazide(3)with different aldehydes. These Schiff bases on reaction with chloro acetyl chloride in presence of triethylamine in dioxane yielded 3-nitro-N-(3-chloro-2-oxo-substituted-phenyl-azetidine-1-yl) naphtha [2,1-b]furan-2-carboxamid

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48

Journal, Baghdad Science. "Synthesis and Characterization of Some Novel Oxazine, Thiazine and Pyrazol Derivatives." Baghdad Science Journal 13, no. 2 (2016): 244–52. http://dx.doi.org/10.21123/bsj.13.2.244-252.

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In this paper, some chalcone derivatives (C1, C2) were synthesized based on the reaction of equal amount of substituted acetophenone and substituted banzaldehyde in basic medium. Oxazine and thiazine derivatives were prepared from the reaction of chalcones (C1-C2) with urea and thiourea respectively in a basic medium. Pyrazole derivatives were prepared based on the reaction of chalcones with hydrazine mono hydrate or phenyl hydrazine in the presence of glacial acetic acid as a catalyst. The new synthesized compounds were identified using various physical techniques like1 H-NMR and FT-IR spectr

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49

Sevenard, D. V., O. G. Khomutov, M. I. Kodess, et al. "Novel polyfluoroalkylated pyrazoles from 2-polyfluoroacylcycloalkanones and hydrazines: syntheses and unequivocal molecular structure assignment." Canadian Journal of Chemistry 79, no. 2 (2001): 183–94. http://dx.doi.org/10.1139/v01-003.

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The reaction between 2-trifluoroacetylcycloalkanones and methylhydrazine or phenylhydrazine exclusively yields 3-CF3-pyrazoles. When the chain length of the polyfluorinated substituent in RFC(O) group increases, 5-RF-pyrazoles are isolated. The reaction of 2-trifluoroacetylcyclohexanone with 2-hydrazinopyradine gives 5-hydroxypyrazoline, an intermediate in the formation of 5-CF3-pyrazoles. The regiochemistry of the condensation is probably controlled by the nucleophilicity of the terminal nitrogen in the mono substituted hydrazines and by the steric requirements of the RF group in the 1,3-dike

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50

Journal, Baghdad Science. "Synthesis and Characterization of New Polyimide Contain Heterocyclic." Baghdad Science Journal 10, no. 4 (2013): 1203–10. http://dx.doi.org/10.21123/bsj.10.4.1203-1210.

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Novel heterocyclic polyimide 5(a,b) have been synthesized based on polyacrylic backbone. The synthetic route start with nucleophilic substitution of 2-amino, or 4-amino, pyridine 1(a,b) to the polyacryloyl chloride afforded poly substituted amide 2(a,b). Another nucleophilic substitution were carried with adipoyl chloride to form polyimide chloride 3(a,b). Treatment of 3(a,b) with hydrazine hydrate afforded acid hydrazide polyimide 4(a,b), which upon cyclocondensation with carbon disulfide gave the target heterocyclic polyimide. The synthesized compounds were identified by spectroscopic method

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