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Wajid Ali, Anjali Dahiya, Ramdhari Pandey, Tipu Alam, Bhisma K Patel
The in situ generated o-alkynylthioureas obtain by reacting 2-(phenylethynyl)anilines and aryl isothiocynates undergo efficient cascade cyclization in the presence of Ag2CO3 to form indoloquinolines under microwave heating. The present tandem process allows the generation of a variety of indolo[2,3-b]quinolines derivatives in good to moderate yields with a wide functional group tolerance.
February 9, 2017: Journal of Organic Chemistry
Jue Liang, Bedia Begüm Karakoçak, Jessica J Struckhoff, Nathan Ravi
Sulfonate-containing hydrogels are of particular interest because of their tunable mechanical and swelling properties, as well as their biological effects. Polysulfonate copolymers were synthesized by reacting 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM), and acrylic acid (AA). We found that the incorporation rate of sulfonate-containing monomer and the molecular weight of the copolymer were significantly enhanced by increasing the ionic strength of the solution. We introduced thiol groups by modifying the pendant carboxylates or copolymerizing along with a disulfide-containing monomer...
December 12, 2016: Biomacromolecules
K Treskes, S A Bos, L F M Beenen, J C Sierink, M J R Edwards, B J A Beuker, G S R Muradin, J Hohmann, J S K Luitse, M W Hollmann, M G W Dijkgraaf, J C Goslings
No abstract text is available yet for this article.
November 28, 2016: European Radiology
K Treskes, S A Bos, L F M Beenen, J C Sierink, M J R Edwards, B J A Beuker, G S R Muradin, J Hohmann, J S K Luitse, M W Hollmann, M G W Dijkgraaf, J C Goslings
OBJECTIVES: To determine whether there is a difference in frequency and clinical relevance of incidental findings detected by total-body computed tomography scanning (TBCT) compared to those by the standard work-up (STWU) with selective computed tomography (CT) scanning. METHODS: Trauma patients from five trauma centres were randomized between April 2011 and January 2014 to TBCT imaging or STWU consisting of conventional imaging with selective CT scanning. Incidental findings were divided into three categories: 1) major finding, may cause mortality; 2) moderate finding, may cause morbidity; and 3) minor finding, hardly relevant...
October 5, 2016: European Radiology
Giorgio Chelucci, Andrea Porcheddu
Efficient ruthenium-, rhodium-, palladium-, copper- and iridium-catalysed methodologies have been recently developed for the synthesis of quinolines by the reaction of 2-aminobenzyl alcohols with carbonyl compounds (aldehydes and ketones) or the related alcohols. The reaction is assumed to proceed via a sequence involving initial metal-catalysed oxidation of 2-aminobenzyl alcohols to the related 2-aminobenzaldehydes, followed by cross aldol reaction with a carbonyl compound under basic conditions to afford α,β-unsaturated carbonyl compounds...
August 15, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Wenxue Yang, Ke-Qing Zhao, Timothy J Prior, David L Hughes, Abdessamad Arbaoui, Mark R J Elsegood, Carl Redshaw
The molecular structures of a number of solvates of the [2 + 2] Schiff-base macrocycles {[2-(OH)-5-(R)-C6H2-1,3-(CH)2][O(2-C6H4N)2]}2 (R = Me L(1)H2, tBu L(2)H2, Cl L(3)H2), formed by reacting 2,6-dicarboxy-4-R-phenol with 2,2'-oxydianiline (2-aminophenylether), (2-NH2C6H4)2O, have been determined. Reaction of L(n)H2 with two equivalents of AlR'3 (R' = Me, Et) afforded dinuclear alkylaluminium complexes [(AlR'2)2L(1-3)] (R = R' = Me (1), R = tBu, R' = Me (2), R = Cl, R' = Me (3), R = Me, R' = Et (4), R = tBu, R' = Et (5), R = Cl, R' = Et (6))...
July 26, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Joanne C Sierink, Kaij Treskes, Michael J R Edwards, Benn J A Beuker, Dennis den Hartog, Joachim Hohmann, Marcel G W Dijkgraaf, Jan S K Luitse, Ludo F M Beenen, Markus W Hollmann, J Carel Goslings
BACKGROUND: Published work suggests a survival benefit for patients with trauma who undergo total-body CT scanning during the initial trauma assessment; however, level 1 evidence is absent. We aimed to assess the effect of total-body CT scanning compared with the standard work-up on in-hospital mortality in patients with trauma. METHODS: We undertook an international, multicentre, randomised controlled trial at four hospitals in the Netherlands and one in Switzerland...
August 13, 2016: Lancet
Solmaz Pirouz, Yulin Wang, J Michael Chong, Jean Duhamel
The secondary amines found in b-PIBSI dispersants prepared by attaching two polyisobutylene chains to a polyamine core via two succinimide moieties were reacted with ethylene carbonate (EC). The reaction generated urethane bonds on the polyamine core to yield the modified b-PIBSI dispersants (Mb-PIBSI). Five dispersants were prepared by reacting 2 molar equivalent (meq) of polyisobutylene terminated at one end with a succinic anhydride moiety (PIBSA) with 1 meq of hexamethylenediamine (HMDA), diethylenetriamine (DETA), triethylenetetramine (TETA), tetraethylenepentamine (TEPA), and pentaethylenehexamine (PEHA) to yield the corresponding b-PIBSI dispersants...
September 17, 2015: Journal of Physical Chemistry. B
Hanaa Mohamad Soliman, Amany M Basuny, Shaker M Arafat
Olive Pomace was firstly dried, then pomace olive oil was extracted, and the obtained oil was hydrolyzed to produce glycerol and mixture of fatty acids. Fatty acids mixture was separated, this mixture was then cooled, where the all saturated fatty acids were solidified, and then they were filtered off. These saturated fatty acids were identified by GC mass after esterification, and were identified as stearic, palmitic and myristic acids. Stearic acid was extracted using supercritical CO2 extractor. The stearic acid was confirmed by means of GC mass after its esterification, and it was used as starting material for preparation of a variety of heterocyclic compounds, which were then tested for their antimicrobial activities...
2015: Journal of Oleo Science
Seshu K Gudlavalleti, Erika N Crawford, Nhi N Tran, Dana J Orten, Jeffery D Harder, Jeeri R Reddy
The ability to accurately measure and report trace amounts of residual formaldehyde impurity in a vaccine product is not only critical in the product release but also a regulatory requirement. In many bacterial or viral vaccine manufacturing procedures, formaldehyde is used either at a live culture inactivation step or at a protein de-toxification step or at both. Reported here is a validated and improved C18-UPLC method (developed based on previously published C-8 HPLC method) to determine the traces of formaldehyde process impurity in a liquid form Neisseria meningitidis A/C/Y/W-135-DT conjugate vaccine formulated in isotonic aqueous 1× PBS...
March 25, 2015: Journal of Pharmaceutical and Biomedical Analysis
Ning Cui, Junmin Qian, Na Zhao, Hongjie Wang
In this study, a novel simple method was developed to prepare functional hyaluronic acid (HA) hydrogels simultaneously containing hydrazone and disulfide bonds in their crossbridges. The HA hydrogels were formed by directly reacting 2,5-hexanedione and 3,3'-dithiodipropionate hydrazide-modified HA, and were characterized by FT-IR, SEM, TGA and mechanical tests. The results showed that the formation of HA hydrogels was a result of the reaction between ketone and hydrazide groups. The resultant HA hydrogels exhibited a porous morphology with a pore size range of 50 μm to 400 μm, and their compressive modulus and G″/G' ratio were 18...
December 2014: Materials Science & Engineering. C, Materials for Biological Applications
Kentaro Okuma, Tomohiro Koga, Saori Ozaki, Yutaro Suzuki, Kenta Horigami, Noriyoshi Nagahora, Kosei Shioji, Masatora Fukuda, Masanobu Deshimaru
Dibenzo[b,h][1,6]naphthyridines were synthesized in one pot by reacting 2-acetylaminobenzaldehyde with methyl ketones under basic conditions via four sequential condensation reactions. This method was also applied to the synthesis of 1,2-dihydroquinolines. 6-Methyl-1,6-dibenzonaphthyridinium triflates showed strong fluorescence, and the fluorescence intensities were changed upon intercalation into double-stranded DNA.
December 21, 2014: Chemical Communications: Chem Comm
Nafal Nazarbahjat, Nurdiana Nordin, Zanariah Abdullah, Mahmood Ameen Abdulla, Wageeh A Yehye, Siti Nadiah Abdul Halim, Chin Hui Kee, Azhar Ariffin
New thiosemicarbazide derivatives 2-6 were synthesised by reacting 2-(ethylsulfanyl)benzohydrazide with various aryl isothiocyanates. The cyclisation of compounds 2-6 under reflux conditions in a basic medium (aqueous NaOH, 4 N) yielded compounds 7-11 that contain a 1,2,4-triazole ring. All of the synthesised compounds were screened for their antioxidant activities. Compounds 2, 3, and 7 showed better radical scavenging in a 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, with IC50 values of 1.08, 0.22, and 0.74 µg/mL, respectively, compared to gallic acid (IC50, 1...
2014: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Shivani Mahajan, Sadhika Khullar, Sanjay K Mandal, Inder Pal Singh
A one pot domino protocol for an efficient synthesis of 7-arylbenzo[c]acridine-5,6-diones, with a novel nucleus, has been developed by reacting 2-hydroxynaphthalene-1,4-dione, aromatic aldehydes and aromatic amines using environmentally benevolent p-toluene sulphonic acid as a catalyst. An exciting feature of this communication is the reaction mechanism that depends on the reaction solvent.
September 11, 2014: Chemical Communications: Chem Comm
U A Mohsen, Z A Kaplancikli, Y Özkay, L Yurttaş
In this present study some benzothiazole derivatives bearing piperazine and thiocarbamate moieties were synthesized and their potential anticholinesterase properties were investigated. A set of 30 new compounds of 2-[(6-substituted benzothiazol-2-yl)amino]-2-oxoethyl 4-substituted piperazine-1-carbodithioate derivatives were synthesized by reacting 2-chloro-N-(6-substituted benzothiazole-2-yl)acetamide derivatives derivatives and sodium salts of appropriate N,N-disubstituted dithiocarbamic acids in acetone...
April 2015: Drug Research
U Abu Mohsen, L Yurttaş, U Acar, Y Özkay, Z A Kaplacikli, H Karaca Gencer, Z Cantürk
In this study, we aimed to synthesize some new quinoxaline derivatives bearing amide moiety and to evaluate their antimicrobial activity. A set of 16 novel compounds of N-[2,3-bis(4-methoxy/methylphenyl)quinoxalin-6-yl]-substituted benzamide derivatives were synthesized by reacting 2,3-bis(4-methoxyphenyl)-6-aminoquinoxaline or 2,3-bis(4-methylphenyl)-6-aminoquinoxaline with benzoyl chloride derivatives in tetrahydrofuran and investigated for their antimicrobial activity. The structures of the obtained final compounds were confirmed by spectral data (IR, (1)H-NMR, (13)C-NMR and MS)...
May 2015: Drug Research
Ryoga Yasuda, Kentaro Iwasa, Fumiya Niikura, Hidetake Seino, Yasushi Mizobe
The reactions of [CpMoH(κ(3)-P4)] (2; P4 = meso-o-C6H4(PPhCH2CH2PPh2)2) with protic acids gave [CpMo(κ(4)-P4)](+) (4(+)) via the intermediary formation of [CpMoH2(κ(3)-P4)](+). Treatment of 2 with iodine provided the cationic complex [CpMoHI(κ(3)-P4)][I] (5[I]). Early-late heterobimetallic complexes of the type [CpMoH(μ-P4-1κ(3):2κ)MLnCl] (MLn = Ru(Hmb)Cl (6), Ir(η(5)-C5Me5)Cl (7), Rh(cod), Ir(cod), Pd(η(3)-C3H5) (10); Hmb = η(6)-C6Me6, cod = η(4)-1,5-cyclooctadiene) were synthesised by reacting 2 with [MLn(μ-Cl)]2, and their structures were characterised by NMR spectroscopy...
June 28, 2014: Dalton Transactions: An International Journal of Inorganic Chemistry
Tulay Y İnan, Emel Yıldız, Birsen Karaca, Hacer Dogan, Alican Vatansever, Muhammed Nalbant, Koray Eken
We produced UV curable lenses with properties blocking short wave UV light. In the UV-curable formulations, we used an oligomer (Ac-PEEK) with another urethan oligomer (Mw = 2000). Radically active, molecular weight controlled Ac-PEEK was obtained by reacting 2-hydroxyl ethyl methacrylate with molecular- weight- controlled and isocyanate terminated PEEK (Mn = 4500). We characterized all synthesized monomer, oligomer and optical materials with UV/Vis spectrophotometer with interferogram, elemental analyser, mass spectrophotometer, proton nuclear magnetic resonance, Fourier transform infrared spectroscopy, thermal gravimetric analyzer, differential scanning calorimeter, scanning electron microscopy and gas chromatography...
August 2014: Journal of Materials Science. Materials in Medicine
C N Banti, L Kyros, G D Geromichalos, N Kourkoumelis, M Kubicki, S K Hadjikakou
The new mixed ligand silver(I) complex of formula [AgI(TPP)2(MBZT)] (1) was obtained by reacting 2-mercapto-benzothiazole (MBZT) with triphenylphosphine (TPP). The complex was characterized by m.p., vibrational spectroscopy (FT-IR), (1)H NMR, UV-vis, ESI-MS spectroscopic techniques and its structure was confirmed by X-ray crystallography. Mixed ligand complexes of silver(I) iodide with thiones and phosphines are very rare in the literature and to the best of our knowledge compound 1 is the first of this kind exhibiting significant biological effects...
April 22, 2014: European Journal of Medicinal Chemistry
Solmaz Pirouz, Yulin Wang, J Michael Chong, Jean Duhamel
A novel methodology based on fluorescence quenching measurements is introduced to determine quantitatively the amine content of polyisobutylene succinimide (PIBSI) dispersants used as engine oil-additives. To this end, a series of five PIBSI dispersants were prepared by reacting 2 mol equiv of polyisobutylene succinic anhydride (PIBSA) with 1 mol equiv of hexamethylenediamine (HMDA), diethylenetriamine, triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine to yield the corresponding b-PIBSI dispersants...
April 10, 2014: Journal of Physical Chemistry. B
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