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Thematische Bibliographien / Urea Amino compounds

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Zeitschriftenartikel

Auswahl der wissenschaftlichen Literatur zum Thema „Urea Amino compounds“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 3. Februar 2022

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Zeitschriftenartikel zum Thema "Urea Amino compounds"

1

Guerrero-Alburquerque, Natalia, Shanyu Zhao, Daniel Rentsch, Matthias M. Koebel, Marco Lattuada, and Wim J. Malfait. "Ureido Functionalization through Amine-Urea Transamidation under Mild Reaction Conditions." Polymers 13, no. 10 (2021): 1583. http://dx.doi.org/10.3390/polym13101583.

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Ureido-functionalized compounds play an indispensable role in important biochemical processes, as well as chemical synthesis and production. Isocyanates, and KOCN in particular, are the preferred reagents for the ureido functionalization of amine-bearing compounds. In this study, we evaluate the potential of urea as a reagent to graft ureido groups onto amines at relatively low temperatures (<100 °C) in aqueous media. Urea is an inexpensive, non-toxic and biocompatible potential alternative to KOCN for ureido functionalization. From as early as 1864, urea was the go-to reagent for polyurea

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2

Perković, Ivana, Zrinka Rajić Džolić, and Branka Zorc. "A convenient synthesis of new NSAID esters containing amino acid, urea and amide moieties." Acta Pharmaceutica 63, no. 3 (2013): 409–18. http://dx.doi.org/10.2478/acph-2013-0023.

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Abstract A convenient synthetic method for the preparation of novel NSAID twin esters 6a-i containing amino acid residue, urea and amide moieties has been developed. The synthetic pathway applied for the preparation of target compounds and key intermediates 1-benzotriazolecarboxylic acid chloride (1), NSAID benzotriazolides 2a-c and N-(1-benzotriazolecarbonyl)-amino acids 3a-d involved benzotriazole as a synthetic auxiliary. The final preparation step of esters 6a-i included the solvent-free reaction of compounds 2a-c with amino acid derivatives 5a-g, bearing two hydroxyl groups, one at each t

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3

Janjanin, Danijela, Marko Karoglan, Mirjana Herak Ćustić, Marijan Bubola, Mirela Osrečak, and Igor Palčić. "Response of ‘Italian Riesling’ Leaf Nitrogen Status and Fruit Composition (Vitis vinifera L.) to Foliar Nitrogen Fertilization." HortScience 51, no. 3 (2016): 262–67. http://dx.doi.org/10.21273/hortsci.51.3.262.

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Two-year study was conducted on Italian Riesling cultivar with the aim to compare the effect of foliar sprays with different nitrogen forms on grapevine leaf N status, yield, and nitrogen compounds in grape juice. Treatments included no fertilization (control), soil NPK treatment, and three foliar treatments [amino acids, urea, ammonia (NH4+)/nitrate] applied four times during season, also treated with soil NPK. The application of 1% w/v urea significantly increased leaf total leaf N content in the second year of study. However, there were no effects on N compounds in grape juice, since change

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4

Hafez, Hend N., and Abdel-Rahman B. A. El-Gazzar. "Synthesis of Novel Pyridine Bearing Biologically Active Imidiazolyl, Pyrazolyl, Oxa/thiadiazolyl and Urea Derivatives as Promising Anticancer Agents." Current Organic Synthesis 17, no. 1 (2020): 55–64. http://dx.doi.org/10.2174/1570179417666191223163225.

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Background: A novel series of pyridine containing 1,3,4-oxa/thiadiazol derivatives 4a,b, pyrazole derivatives 5-7, thiazole derivatives 9a,b and 17a-c, urea derivatives 12a-c, imidiazole derivative 16, imidazo[1,2-a]pyridine derivatives 18a, b, tetrazole 19, pyrane 20 and pyridine derivatives 21 has been synthesized. Objective: This research aims to synthesize 6-(Trifluoromethyl)-2-[3-(trifluoromethyl)phenyl] amino nicotinohydrazide 2 and 6-(trifluoromethyl)-2-[3-(trifluoromethyl)phenyl]amino pyridin-3-carboaldhyde 15 as key intermediate for the synthesis of novel pyridine derivatives bearing

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5

Tang, Keyong, Weilin Li, Jie Liu, Cheng-Kung Liu, and Hongbo Pan. "Mechanism of Collagen Processed with Urea Determined by Thermal Degradation Analysis*." Journal of the American Leather Chemists Association 115, no. 10 (2020): 380–89. http://dx.doi.org/10.34314/jalca.v115i10.4172.

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During the beamhouse process for nappa leather, pelts are usually limed with amino compounds such as urea, ethylenediamine, and triethanolamine. However, the interaction between amino compounds and collagen is not well known. In this work, collagen fibers were soaked in various concentrations of urea and the thermal degradation of collagen fibers were studied by the methods Horowitz-Metzger and Coats-Redfern. The mechanism of the reaction between urea and collagen fibers is discussed, wherein the thermal degradation activation energy first decreases and then increases. The lowest thermal degra

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6

Katla, Ramana, Rasheed Syed, Madhava Golla, Adam Shaik, and Raju Chamarthi. "Synthesis and biological evaluation of novel urea and thiourea derivatives of valacyclovir." Journal of the Serbian Chemical Society 79, no. 3 (2014): 283–89. http://dx.doi.org/10.2298/jsc120716095k.

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A series of novel urea and thiourea derivatives of valacyclovir were efficiently synthesized in high yields and evaluated their antiviral activity. 2-((6-Amino-4-oxo-4,5-dihydro-1H-imidazo[4,5-c]pyridin-1-yl)methoxy)ethyl-2-amino-3-ethylbutanoate (valacyclovir) 1 is reacted with various aromatic isocyanates/thiocyanates 2 in the presence of N, N- dimethyl piperazine as a base in THF: pyridine (4:1) to obtain valacyclovir urea/thiourea derivatives 3(a-j). The structures of the title compounds 3(a-j) were confirmed by IR, NMR (1H, 13C), mass spectral and elemental analysis. The newly synthesized

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7

Honda, Ichiro, Makoto Sibagaki, Koichi Yoneyama, et al. "Photosystem II Inhibition by Phloroglucinol Derivatives Having Both Phenol and Urea Functionalities." Zeitschrift für Naturforschung C 48, no. 3-4 (1993): 159–62. http://dx.doi.org/10.1515/znc-1993-3-408.

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Abstract Esters of 3-nitrophloroglucinecarboxylic acid were found to be active photosystem II (PS II) inhibitors, as were the amides, indicating that, in their structures, the substituted phloroglucinol nuclei themselves plays a major roles in PS II inhibition. Among the phenylureidoalkyl esters tested, 3,4-dichlorophenylurea compound having two amino hydrogen atoms showed high activities. Optimal activity was associated with compounds in which the oxygen atom and the urea structure in the ester side chain were connected via an ethylene group.

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8

Kathiriya, P. J., H. D. Purohit, and Dipak M. Purohit. "Synthesis and Antimicrobial Activity of 2-{4'-[(6"-Aryl)2"-Hydroxy-3",4"-Dihydro-Pyrimidine-4"-yl]-Phenyl Amino}-6-[Bis (2'"-Chloroethyl) Amino]-4-Methoxy-1,3,5-Triazine." International Letters of Chemistry, Physics and Astronomy 49 (April 2015): 137–42. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.49.137.

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The titled compounds (5a-5k) have been synthesized by the condensation of 2-{4'-[(3"-aryl)-2"-Propene-1"-one]-Phenyl amino}-6-[bis-2""-chloroethyl) amino]-4-methoxy-1,3,5-triazine with urea in presence of conc. HCl (0.3ml) The biological activities of these compounds have been examined against various Gram +ve, Gram –ve bacteria and fungi. The structure of the products was confirmed by IR, 1H NMR, Mass spectra and elemental analysis.

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9

Liu, Shenghui, Hailong He, Min Gan, Peng Yi та Xiaojian Jiang. "Catalytic Asymmetric Intramolecular Bromolactonization of α,β-Unsaturated Ketones". Synlett 30, № 12 (2019): 1474–78. http://dx.doi.org/10.1055/s-0037-1611860.

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Enantioselective bromolactonization by using an amino-urea catalyst to generate the important bromo-containing 3,4-dihydroisocoumarins is described. Excellent yields and good enantioselectivities could be achieved for various 3,4-dihydroisocoumarin compounds.

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10

Liu, Juan, Jing Ya Nan, Chun Peng Wang, Tie Ling Jin, and Ri Qing Chen. "Orthogonal Experimental Study on Moulding Conditions of Amino Moulding Plastic." Advanced Materials Research 900 (February 2014): 596–600. http://dx.doi.org/10.4028/www.scientific.net/amr.900.596.

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In this paper, the moulding conditions of urea-formaldehyde resin were optimized to prepare moulding plastic with good mechanical properties using orthogonal experimental design method. The effects of moulding temperature, pressure and pressing time on the impact strength and blending strength of urea-formaldehyde resin were studied and analyzed. The results showed that moulding temperature had most noticeable influence on the impact strength and blending strength of urea-formaldehyde moulding compounds. The ratio F of moulding temperature to the impact strength was 2.077; the ratio F of mould

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