cas 1967-25-5, 4-Bromophenylurea | Articles data

Articles about 1967-25-5Total 24 be found

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Synthesis of Five-Membered Cyclic Guanidines via Cascade [3 + 2] Cycloaddition of α-Haloamides with Organo-cyanamides
The convenient preparation of N2-unprotected five-membered cyclic guanidines was achieved through a cascade [3 + 2] cycloaddition between organo-cyanamides and α-haloamides under mild conditions in good to excellent yields (up to 99%). The corresponding cyclic guanidines could be easily transformed into hydantoins via hydrolysis.
Wang, Chuan-Chuan,Qu, Ya-Li,Liu, Xue-Hua,Ma, Zhi-Wei,Yang, Bo,Liu, Zhi-Jing,Chen, Xiao-Pei,Chen, Ya-Jing
p. 3546 - 3554
(2021/02/16)

A Straightforward Synthesis of N-Substituted Ureas from Primary Amides
A direct and convenient method for the preparation of N-substituted ureas is achieved by treating primary amides with phenyliodine diacetate (PIDA) in the presence of an ammonia source (NH 3 or ammonium carbamate) in MeOH. The use of 2,2,2-trifluoroethanol (TFE) as the solvent increases the electrophilicity of the hypervalent iodine species and allows the synthesis of electron-poor carboxamides. This transformation involves a nucleophilic addition of ammonia on the isocyanate intermediate generated in situ by a Hofmann rearrangement of the starting amide.
Franck, Xavier,Glachet, Thomas,Ibert, Quentin,Lohier, Jean-Fran?ois,Reboul, Vincent,Saraiva Rosa, Nathalie
p. 2099 - 2105
(2020/07/13)

Direct conversion of carboxylic acids to various nitrogen-containing compounds in the one-pot exploiting curtius rearrangement
Herein we report, a single-pot multistep conversion of inactivated carboxylic acids to various N-containing compounds using a common synthetic methodology. The developed methodology rendered the use of carboxylic acids as a direct surrogate of primary amines, for the synthesis of primary ureas, secondary/tertiary ureas, O/S-carbamates, benzoyl ureas, amides, and N-formyls, exploiting the Curtius reaction. This approach has a potential to provide a diversified library of N-containing compounds, starting from a single carboxylic acid, based on the selection of the nucleophile.
Kumar, Arun,Kumar, Naveen,Sharma, Ritika,Bhargava, Gaurav,Mahajan, Dinesh
p. 11323 - 11334
(2019/09/10)

Design and synthesis of novel N-(4-(Pyridin-2-yloxy)benzylidene)-4-[4-(substituted)phenyl]semicarbazides as potential anticonvulsant agents
A new series of N-(4-(pyridin-2-yloxy)benzylidene)-4-[4-(substituted)phenyl]semicarbazides (PSSD1-8) were designed and synthesized keeping in view the structural requirement of pharmacophore and evaluated for their possible anticonvulsant activity. All the derivatives were synthesized by the given scheme and reaction process was monitored by thin layer chromatography. The structure of synthesized derivatives was confirmed by FT-IR, 1H NMR, mass spectroscopy and elemental analysis. The anticonvulsant activity was established after intraperitoneal administration in MES and scMET seizure models. The most active compound of the series was 1-(4-(pyridin-2-yloxy)-benzylidene)-4-p-tolylsemicarbazide (PSSD5). A molecular docking study was carried out in order to assess the interaction and binding modes with target receptor/enzyme. Titled compounds were found to strongly bind to human gamma-aminobutyric acid receptor (GABAAR-β3). A computational study was also carried to predict the pharmacokinetic properties of the synthesized compounds.
Singh, Prem,Tripathi, Laxmi
p. 2193 - 2200
(2018/09/10)

DRUG WITH HEPATOPROTECTIVE ACTIVITY
The invention relates to pharmacology and can be used for treating liver diseases of various etiologies, inter alia, in combination with other preparations. Claimed is a drug with hepatoprotective activity comprised of 3-(4-bromophenyl)-6,6-dihydroxy-5-hydroxyiminohexahydro-2,4-pyrimidinedione and salts thereof of general formula (I), where X is selected from the group: H, Na, K, or from the group of hydroxyalkylammonia derivatives of general formula (II), where R1, R2 are selected from the group: H, CH3, CH2CH3, CH2CH2OH; R3 is selected from the group: H, CH2OH; and n=1, 2; the drug can be prepared in the form of tablets or capsules for enteral administration; or in the form of a liquid or lyophilized substance for parenteral administration; or in the form of rectal suppositories; or in the form of capsules or tablets, or sweets for sucking; and may additionally contain the hepatoprotector Heptral; or the hepatoprotector Essentiale; or the hepatoprotector ursodeoxycholic acid. This increases the effectiveness of a drug with hepatoprotective activity.
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Paragraph 0022

(2018/12/11)

A practically simple, catalyst free and scalable synthesis of: N -substituted ureas in water
A practically simple, mild and efficient method is developed for the synthesis of N-substituted ureas by nucleophilic addition of amines to potassium isocyanate in water without organic co-solvent. Using this methodology, a variety of N-substituted ureas (mono-, di- and cyclic-) were synthesized in good to excellent yields with high chemical purity by applying simple filtration or routine extraction procedures avoiding silica gel purification. The developed methodology was also found to be suitable for gram scale synthesis of molecules having commercial application in large volumes. The identified reaction conditions were found to promote a unique substrate selectivity from a mixture of two amines.
Tiwari, Lata,Kumar, Varun,Kumar, Bhuvesh,Mahajan, Dinesh
p. 21585 - 21595
(2018/06/26)

Photocatalytic Oxidative Bromination of Electron-Rich Arenes and Heteroarenes by Anthraquinone
The estimated excited oxidation potential of sodium anthraquinone-2-sulfonate (SAS) increases from 1.8 V to about 2.3 V vs SCE by protonation with Br?nsted acids. This increased photooxidation power of protonated anthraquinone was used for the regio-selective oxidative bromination of electron rich (hetero)arenes and drugs in good yield. The mild reaction conditions are compatible with many functional groups, such as double and triple bonds, ketones, amides and amines, hydroxyl groups, carboxylic acids and carbamates. Mechanistic investigations indicate the photooxidation of the arene followed by nucleophilic bromide addition as the likely pathway. (Figure presented.).
Petzold, Daniel,K?nig, Burkhard
supporting information
p. 626 - 630
(2017/11/22)

Efficient Direct Halogenation of Unsymmetrical N -Benzyl- and N -Phenylureas with Trihaloisocyanuric Acids
A simple and efficient methodology for the direct halogenation of N -phenylureas was developed using trihaloisocyanuric acids in acetonitrile at room temperature. This protocol proved to be effective for the construction of N -phenylureas with different patterns of substitution. Additionally, less reactive N -benzylureas were halogenated in the presence of a mixture of trifluoroacetic acid and acetonitrile at room temperature.
Sanabria, Carlos M.,Costa, Bruno B. S.,Viana, Gil M.,De Aguiar, Lúcia C. S.,De Mattos, Marcio C. S.
p. 1359 - 1367
(2017/12/26)

Optimization of 5-arylidene barbiturates as potent, selective, reversible LSD1 inhibitors for the treatment of acute promyelocytic leukemia
Histone lysine specific demethylase 1 (LSD1) is overexpressed in diverse hematologic disorders and recognized as a promising target for blood medicines. In this study, molecular docking-based virtual screening united with bioevaluation was utilized to identify novel skeleton of 5-arylidene barbiturate as small-molecule inhibitors of LSD1. Among the synthesized derivatives, 12a exhibited reversible and potent inhibition (IC50 = 0.41 μM) and high selectivity over the MAO-A and MAO-B. Notably, 12a strongly induced differentiation effect on acute promyelocytic leukemia NB4 cell line and distinctly escalated the methylation level on histone 3 lysine 4 (H3K4). Our findings indicate that 5-arylidene barbiturate may represent a new skeleton of LSD1 inhibitors and 12a deserve as a promising agent for the further research.
Xu, Siyuan,Zhou, Chen,Liu, Rongfeng,Zhu, Qihua,Xu, Yungen,Lan, Fei,Zha, Xiaoming
p. 4871 - 4880
(2018/09/22)

Barbiturate compound, preparing method and application thereof
The invention belongs to the field of medicinal chemistry, and discloses a barbiturate compound, a preparing method and application thereof. Specifically, the invention relates to the compound as shown in formula I, and a medicinal usage thereof as a selective LSD1 reversible inhibitor, particular to the application in preparing of antitumor medicine. A test shows that the compound in formula I can efficiently reversibly inhibit LSD1 activity, and has a weak inhibition action for homologous proteins MAO-A and MAO-B, can intensively induce differentiation of leukemia cell NB4 and obviously enhance the methylation level of primers H3K4me1 and H3K4me2 of the LSD1.
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Paragraph 0041; 0042; 0043

(2016/10/09)

Design and biological evaluation of novel 4-(2-fluorophenoxy)quinoline derivatives bearing an imidazolone moiety as c-Met kinase inhibitors
A series of 4-(2-fluorophenoxy)quinoline derivatives containing an imidazolone moiety were designed, synthesized and evaluated for their in vitro biological activities against c-Met kinase and four cancer cell lines (A549, H460, HT-29 and MKN-45). Most compounds showed moderate to excellent activities in enzyme and cellular assays. The most promising analog, 58 (c-Met IC50 = 1.42 nM), displayed 2.1-, 8.6-fold increase against H460, and MKN-45 cell lines, respectively, compared with foretinib. An analysis of structure-activity relationships revealed that an ortho substituted phenyl ring as well as an N-unsubstituted imidazolone linker is favorable for antitumor activity.
Liao, Weike,Hu, Gang,Guo, Zhuang,Sun, Deyu,Zhang, Lixia,Bu, Yanxin,Li, Yingxiu,Liu, Yajing,Gong, Ping
p. 4410 - 4422
(2015/08/03)

Poly (ethylene glycol)-bound sulphonic acid as a novel catalyst for synthesis of benzoxazoles
ABSTRACT Ahighly efficient, simple and rapid method for the preparation of various 2-aminobenzoxazoles and other benzoxazole derivatives using a catalytic amount of poly (ethylene glycol)-bound sulphonic acid (PEG-SO3H) is described. PEG-SO3H is found to be economical and reusable catalyst with low catalytic loading. The percentage yield was found to be satisfactory, experimental set-up and purification of final products is facile and easy. GRAPHICAL ABSTRACT.
Chikhale, Rupesh V.,Pant, Amit M.,Menghani, Sunil S.,Wadibhasme, Pankaj G.,Khedekar, Pramod B.
p. 254 - 262
(2013/12/04)

Synthesis and antitumor activity of novel diaryl ether hydroxamic acids derivatives as potential HDAC inhibitors
A series of diaryl ether hydroxamic acids were synthesized for the first time and evaluated for the HDAC biology and antiproliferative activity. The structures of these new hydroxamic acids derivatives were confirmed by IR, 1H-NMR and mass spectrum. Some of these compounds showed micro molar activity in the HDAC inhibitory assay and against four cancer cell lines.
Zhu, Yong,Chen, Xin,Wu, Zeng,Zheng, Yixuan,Chen, Yadong,Tang, Weifang,Lu, Tao
p. 1723 - 1732
(2013/03/13)

Synthesis and pharmacological screening of some novel chalconyl derivatives of substituted phenyl semicarbazide
In the present study, we have synthesized chalcone and semicarbazide-linked chalonyl derivatives and the titled compounds confirmed by MS, IR, and 1H NMR techniques. The anticonvulsant activity was determined by maximal electroshock (MES) induced seizure method. A majority of the compounds exhibited significant anticonvulsant activity after intraperitoneal administration. The results show the importance of hydrogen bonding for activity. In the present study 5e, 5h, 5i, 6e, 6h, and 6i emerged as the most active molecules, showed significant anticonvulsant of activity. Springer Science+Business Media, LLC 2010.
Singh, Hemendra Pratap,Pandeya,Chauhan,Sharma, Chandra Shekhar
experimental part
p. 74 - 80
(2012/02/04)

Design, synthesis, and potential CNS activity of some new bioactive 1-(4-substituted-phenyl)-3-(4-oxo-2-methyl- 4H-quinazolin-3-yl)-urea
Twelve new 1-(4-substituted-phenyl)-3-(4-oxo- 2-methyl-4H-quinazolin-3-yl)- urea were synthesized and screened for anticonvulsant, CNS depressant, and sedativehypnotic activity. After i.p. injection to mice at doses of 30, 100, and 300 mg/kg body weight 2,3-Disubstitutedquinazolin- 4(3H)-one were examined in the maximal electroshock-induced seizures (MES) and subcutaneous pentylenetetrazole (scPTZ) induced seizure models in mice. Spectroscopic data and elemental analysis were consistent with the newly synthesized compounds. The neurotoxicity was assessed using the rotorod method. M3, M4 and M10 were found to be active in both MES screen and scPTZ screen at 0.5 h. All except M11 showed more than 44% decrease in locomotor activity after 1 h of compound administration via actophotometer screen. CNS-depressant activity screened with the help of the forced swim method resulted into some potent compounds. Except for M6 and M11 other tested compounds were found to exhibit potent CNS depressants activity as indicated by increased immobility time. It can be concluded that newly synthesized compounds possessed sedative-hypnotic and CNS depressant activities. Springer Science+Business Media, LLC 2010.
Kashaw, Sushil K.,Kashaw, Varsha,Mishra, Pradeep,Jain,Stables
experimental part
p. 738 - 745
(2012/05/20)

Synthesis and anticonvulsant activity of halo-substituted aryl urea and thioureas
Halo-substituted arylureas have been prepared by condensation of halo-substituted primary arylamine with sodium cyanate and halo-substituted arylthioureas have been prepared by condensation of halo-substituted primary arylamine with ammonium thiocyanate in presence of acid. The structures of compounds synthesized have been confirmed by elemental analysis and spectral data. Their anticonvulsant activity was evaluated, p-bromophenyl urea and p-chlorophenyl and p-bromophenyl thioureas were found to be most active in the maximal electro shock (MES) test. p-Bromophenyl derivatives were found least neurotoxic in the rotorod test. The results were compared with standard drug phenytoin.
Gupta, Mahesh Kumar,Pandeya, Suerendra N.,Zaiad, Golal M.,Gangwar
experimental part
p. 1421 - 1424
(2011/09/20)

Synthesis, anticonvulsant and CNS depressant activity of some new bioactive 1-(4-substituted-phenyl)-3-(4-oxo-2-phenyl/ethyl-4H-quinazolin-3-yl)-urea
Several new 1-(4-substituted-phenyl)-3-(4-oxo-2-phenyl/ethyl-4H-quinazolin-3-yl)-urea were synthesized and screened for anticonvulsant, CNS depressant and sedative-hypnotic activity in the mice. After i.p. injection to mice at doses of 30, 100, and 300 mg/kg body weight synthesized compounds were examined in the maximal electroshock induced seizures (MES) and subcutaneous pentylenetetrazole (scPTZ) induced seizure models in mice. Spectroscopic data and elemental analysis were consistent with the newly synthesized compounds. The neurotoxicity was assessed using the rotorod method. Compounds E1, E6, E9, E12, P3, P4 and P6 were found to be active in the MES screen whereas E1, P4, P6 and P11 were found to be active in the scPTZ screen. All except E6, E11 and P6 showed more than 50% decrease in locomotor activity at 1 h of compound administration via actophotometer screen. CNS depressant activity screened with the help of the forced swim method resulted into some potent compounds. All the compounds were found to exhibit potent CNS depressants activity as indicated by increased immobility time. It can be concluded that newly synthesized compounds possessed promising CNS activities.
Kashaw, Sushil K.,Kashaw, Varsha,Mishra, Pradeep,Jain,Stables
experimental part
p. 4335 - 4343
(2009/12/24)

Hybrid calix[4]arenes via ionic hydrogenation and transition-metal-mediated processes
We report the first application of ionic hydrogenation for the synthesis of upper-rim urea- or carbamate-derived hybrid calix[4]arenes. Subsequent metal-mediated transformations using 4-iodophenylurea calixarenes afforded structurally unique 1,3-di(biaryl)-, 1,3-di(biarylalkyne)-, or 1,3-(biaryl)(biarylalkyne)-derived hybrid calixarenes.
Bew, Sean P.,Brimage, Rebecca A.,Hiatt-Gipson, Glyn,Sharma, Sunil V.,Thurston, Sean
supporting information; experimental part
p. 2483 - 2486
(2009/10/18)

Synthesis and activity of 1,3,5-triphenylimidazolidine-2,4-diones and 1,3,5-triphenyl-2-thioxoimidazolidin-4-ones: Characterization of new CB 1 cannabinoid receptor inverse agonists/antagonists
Obesity and metabolic syndrome, along with drug dependence (nicotine, alcohol, opiates), are two of the major therapeutic applications for CB 1 cannabinoid receptor antagonists and inverse agonists. In the present study, we report the synthesis and structure-affinity relationships of 1,5-diphenylimidazolidine-2,4-dione and 1,3,5-triphenylimidazolidine-2,4-dione derivatives. These new 1,3,5-triphenylimidazolidine-2,4-dione derivatives and their thio isosteres were obtained by an original pathway and exhibited interesting affinity and selectivity for the human CB1 cannabinoid receptor. A [35S]-GTPγS binding assay revealed the inverse agonist properties of the compounds at the CB1 cannabinoid receptor. Furthermore, molecular modeling studies were conducted in order to delineate the binding mode of this series of derivatives into the CB1 cannabinoid receptor. 1,3-Bis(4-bromophenyl)-5-phenylimidazolidine-2,4-dione (25) and 1,3-bis(4-chlorophenyl)-5-phenylimidazolidine-2,4-dione (23) are the imidazolidine-2,4-dione derivatives possessing the highest affinity for the human CB1 cannabinoid receptor reported to date.
Muccioli, Giulio G.,Wouters, Johan,Charlier, Caroline,Scriba, Gerhard K. E.,Pizza, Teresa,Di Pace, Pierluigi,De Martino, Paolo,Poppitz, Wolfgang,Poupaert, Jacques H.,Lambert, Didier M.
p. 872 - 882
(2007/10/03)

1-Benzhydryl-3-phenylurea and 1-benzhydryl-3-phenylthiourea derivatives: New templates among the CB1 cannabinoid receptor inverse agonists
New 1-benzhydryl-3-phenylurea derivatives and their 1-benzhydryl-3- phenylthiourea isosteres were synthesized and evaluated for their human CB 1 and CB2 cannabinoid receptor affinity. These compounds proved to be selective CB1 cannabinoid receptor ligands, acting as inverse agonists in a [35S]-GTPγS assay. The affinity of 3,5,5′-triphenylimidazolidine-2,4-dione and 3,5,5′-triphenyl-2- thioxoimidazolidin-4-one derivatives, possessing the 1-benzhydryl-3-phenylurea and 1-benzhydryl-3-phenylthiourea moiety, respectively, was also evaluated. In conclusion, the 1-benzhydryl-3-phenylurea scaffold seems to be a new interesting template of CB1 cannabinoid receptor inverse agonists.
Muccioli, Giulio G.,Wouters, Johan,Scriba, Gerhard K. E.,Poppitz, Wolfgang,Poupaert, Jacques H.,Lambert, Didier M.
p. 7486 - 7490
(2007/10/03)

Reaction of phenylurea and N-trimethylsilyl-N′-phenylurea with vanadocene and N-bromosuccinimide
Phenylurea and N-trimethylsilyl-N′-phenylurea react with vanadocene (Cp2V) in toluene to give N-(η5-cyclopentadienyl) vanadio-N′-phenylurea as a major product and Cp2VN=C=O and aniline as by-products. The reaction of N-trimethylsilyl-N′-phenylurea with N-bromosuccinimide in THF produces, instead of expected N-phenylureidosuccinimide and bromotrimethylsilane, succinimide and N-(p-bromophenyl)-N-trimethylsilylurea which hydrolyzes to form (p-bromophenyl)urea.
Gordetsov,Zimina,Kulagina,Moseeva,Kurskii,Lopatin
p. 1557 - 1560
(2007/10/03)

Versatile access to benzhydryl-phenylureas through an unexpected rearrangement during microwave-enhanced synthesis of hydantoins
(Equation presented) A new access to benzhydryl-phenylureas is described. These new interesting urea derivatives were obtained by reaction of substituted benzils with substituted phenylureas under microwave irradiation. Phenylthiourea, when reacted with benzil, gave 3-phenyl-thiohydantoin. Moreover, benzylurea, as phenethylurea, gave the corresponding 3-substituted hydantoin derivatives, demonstrating that only phenylurea derivatives can result in benzhydryl-phenylureas under the applied conditions. This new reaction proved to be an easy access to substituted 1-benzhydryl-3-phenyl-ureas.
Muccioli, Giulio G.,Wouters, Johan,Poupaert, Jacques H.,Norberg, Bernadette,Poppitz, Wolfgang,Scriba, Gerhard K. E.,Lambert, Didier M.
p. 3599 - 3602
(2007/10/03)

Synthesis and antitumour evaluation of 4-bromophenyl semicarbazones
4-Bromophenyl semicarbazone derivatives have been synthesized and their chemical structures have been confirmed by means of their IR, 1H-NMR data and by elemental analyses. The in vitro evaluation in the 3-cell line, one dose primary anticancer assay is described. The 4-bromo substituted p-nitrobenzylidene phenyl semicarbazone (5) showed significant activity against breast MCF7 cell line and was further evaluated for potential anticancer activity in an in vitro human disease-oriented tumour cell line screening panel that consisted of 59 human tumour cell lines arranged in nine subpanels, representing diverse histologies. Melanoma UACC-62 cell line was relatively more sensitive to compounds 5 (growth inhibition: GI50 = 15.3 μmol/l).
Pandeya, Surendra N.,Yogeeswari, Perumal,Sausville, Edward A.,Mauger, Anthony B.,Narayanan, Ven L.
p. 103 - 108
(2007/10/03)

A kinetic study of the denitrosation and hydrolysis reactions of N-nitrosophenylureas
The kinetics of the decomposition of N-nitroso-phenylurea in aqueous solution have been studied in the acidity range 0.035-0.36 mol.l-1-HCIO4 and in buffer solutions of pH 3.98-6.14.Below pH 3 the decomposition proceeds mainly by acid catalysed denitrosation, but a small uncatalysed contribution has also been detected.The general acid catalysis, the absence of nucleophilic catalysis by halides and the isotopic effect (kH:kD ca. 1.5) allow a mechanism to be proposed in which the protonation of N-nitrosophenylurea is the rate determining step.The results obtained on studying the denitrosation of some ring-derivatives of N-nitrosophenylurea show a little effect on reaction rate.The mechanism proposed for the hydrolysis reaction (studied at pH > 3.9) involves the formation of a nitrosourea hydrate under steady state conditions, which undergoes an OH(1-) catalysed reaction yielding benzenediazonium ion and an uncatalysed reaction yielding an unidentified product.This latter pathway is virtually negligible at the highest values of pH worked with.
Casado, Julio,Castro, Albino,Lorenzo, Francisco Manuel,Meijide, Francisco,Mosquera, Manuel
p. 597 - 601
(2007/10/02)