共查询到20条相似文献,搜索用时 15 毫秒
1.
Manas Chakrabarty Sulakshana Karmakar Ratna Mukherjee Shiho Arima Yoshihiro Harigaya 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):375-380
Abstract 1-Alkyl/phenyl-2-arylbenzimidazoles have been synthesized in very good to excellent yields by a one-pot condensation of N-alkyl/phenyl-o-phenylenediamines with aryl aldehydes in water at room temperature using cetylpyridinium bromide as a cheap and eco-friendly
catalyst.
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2.
Mohammad A. Khalilzadeh Issa Yavari Zinatossadat Hossaini Hasan Sadeghifar 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):467-471
Abstract A novel method for oxazine ring formation is established using the reaction of ammonium thiocyanate and acid chlorides with
napthols in the presence of N-methylimidazole to afford [1,3]oxazine-4-thione derivatives in excellent yields.
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3.
Barahman Movassagh Mohammad Soleiman-Beigi 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):409-411
Abstract A simple, highly efficient, and green protocol has been developed for preparation of sulfides from alkyl or aryl thiols and
benzyl-, allyl-, t-butyl, and adamantyl halides under solvent- and catalyst-free conditions.
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4.
Adel A.-H. Abdel-Rahman Ahmed E.-S. Abdel-Megied Hamed M. Abdel-Bary Abdel-Aleem H. Abdel-Aleem Emad M. I. Morcy Mohamed T. Shabaan 《Monatshefte für Chemie / Chemical Monthly》2009,140(5):559-564
Abstract A series of peptide derivatives conjugated with N1-protected tryptophan residue was synthesized. The prepared compounds were tested for antimicrobial activity against four
different bacterial species displaying different degrees of antibacterial activities or inhibitory actions.
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5.
Abstract One-pot, three-components synthesis of 2,4,6-triarylpyridines and 5-unsubstituted-3,4-dihydropyrimidin-2(1H)-ones was performed under solvent-free conditions using molecular iodine as the catalyst in moderate to good product yields.
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6.
Rahman Hosseinzadeh Mahmood Tajbakhsh Maryam Mohadjerani Zahra Lasemi 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):57-60
Abstract Ethylenebis(N-methylimidazolium) ditribromide, a stable crystalline solid, is easily prepared by reaction of the corresponding dibromide
salt with bromine in n-hexane. 1,3-Diketones and β-ketoesters can be brominated chemoselectively to the corresponding α-monobrominated products
by using this reagent at 0–5 °C. Under the same reaction conditions, diethyl malonate, ethyl cyanoacetate, and malonitrile
were monobrominated at moderate yield.
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7.
Marco Rupprich Clemens Decristoforo Barbara Matuszczak 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):405-407
Abstract In contrast to the results presented in a previous report, the direct conversion of alcohols to alkyl fluorides with triphenylphosphine
and potassium fluoride in CCl4/DMF under mild conditions failed.
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8.
Zhi-zhong Wang Wei Jiao Guang-yun He Run-hua Lu 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):79-81
Abstract A simple method for the straightforward regioselective synthesis of 2,3-mannoepoxy-β-cyclodextrin, which is a valuable precursor for further functionalization of β-cyclodextrin, is achieved under aqueous conditions without any organic solvents at a moderate yield.
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9.
Wael A. El-Sayed Ibrahim F. Nassar Adel A.-H. Abdel-Rahman 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):365-370
Abstract New C-furyl glycosides bearing pyrazolines, isoxazolines, and dihydropyrimidine-2(1H)-thiones were synthesized in order to increase the number of tested compounds screened for antimicrobial activity. The antimicrobial
activity screening showed that the pyrazoline derivatives were the most active compounds.
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10.
Svetlana Marković Zorica D. Petrović Vladimir Petrović 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):171-175
Abstract The mechanism of the preactivation process of trans-dichlorobis(diethanolamine-N)palladium(II) complex is investigated using density functional theory. The role of diethanolamine (a solvent for the reaction
in the absence of a strong base) and acetonitrile (solvent for the reaction in the presence of a strong base) is analyzed
by using a discrete model. The Onsager model is applied to assess the effect of the bulk medium. Both models show that diethanolamine
activates the complex and thus is a better suited solvent for the Heck reactions of the investigated complex.
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11.
Jolanta Pawłowska Krzysztof K. Krawczyk Krystyna Wojtasiewicz Jan K. Maurin Zbigniew Czarnocki 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):83-86
Abstract (+)-Lortalamine was synthesised using (S)-(−)-α-methylbenzylamine as a chiral auxiliary. The stereochemistry of an intermediate compound was established on the basis
of X-ray crystallography, allowing unambiguous assignment of the absolute configuration.
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12.
Hitoshi Shirase Yukie Mori Yutaka Fukuda Masanobu Uchiyama 《Monatshefte für Chemie / Chemical Monthly》2009,140(7):801-805
Abstract Bis[N-(1-pyrenylmethyl)salicylideneaminato]zinc(II) emits intense fluorescence on excitation of the pyrenyl group. This fluorescence
originates from the excited state of the salicylideneamine moiety, indicating that efficient intramolecular energy transfer
takes place. The occurrence of such efficient energy transfer is accounted for by significant spectral overlap between the
emission from the S1 state of the pyrenyl group and the absorption of the salicylideneamine–zinc complex.
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13.
Emanuel Makrlík Petr Vaňura Jan Budka 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):583-585
Abstract The stability constant of the dibenzo-18-crown-6·H3O+ cationic complex species dissolved in nitrobenzene saturated with water has been determined from extraction experiments in
the two-phase water–nitrobenzene system and from γ-activity measurements. Various structures of protonated dibenzo-18-crown-6 are discussed.
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14.
Application of various ionic liquids as cosolvents for chloroperoxidase-catalysed biotransformations
Abstract Chloroperoxidase from Caldariomyces fumago catalyses oxidation of indole and thioanisole in reaction mixtures containing up to 40% (v/v) of different ionic liquids (ILs). Results indicate that ILs containing tosylate, trifluoroacetate, chloride, and methylsulfate
anions are suitable cosolvents for these transformations, yielding high enantiomeric excess and good conversion rates.
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15.
Bohumil Proksa Richard Hercek Tibor Liptaj Nada Prónayová 《Monatshefte für Chemie / Chemical Monthly》2009,140(5):485-487
Abstract A new compound was isolated from the reaction mixture after O-demethylation of 6-O-acetyl-10α-acetoxycodeine with boron tribromide. The structure of this compound, 10α-hydroxy-β-isomorphine, was elucidated by spectral data, and its spatial arrangement was deduced from an NOE experiment. Capillary zone
electrophoresis was used for separation of morphine and its 10-hydroxy analogues.
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16.
Svetlana Marković Sonja Stanković Slavko Radenković Ivan Gutman 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):153-156
Abstract Two mechanisms for the isomerization of cyclopenta[fg]aceanthrylene to acefluoranthene were revealed. The first pathway occurs via a cyclobutyl intermediate, whereas the second
pathway involves a transition state that contains an sp
3-hybridized carbon atom. Both patterns show that the Stone-Wales rearrangement requires extremely high activation energy and
indicate that the isomerization process can occur only under a drastic temperature regime.
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17.
Abolghasem Davoodnia Mehdi Bakavoli Mehdi Soleimany Niloofar Tavakoli-Hoseini 《Monatshefte für Chemie / Chemical Monthly》2009,47(3):355-358
Abstract A new route to the synthesis of 2-arylthieno[2,3-d]pyrimidin-4(3H)-ones has been developed through heterocyclization of 2-amino-4,5-dimethylthiophene-3-carboxamide
with aromatic aldehydes in boiling glacial acetic acid followed by air oxidation. The unoxidized intermediates, 2-aryl-2,3-dihydrothieno[2,3-d]pyrimidin-4(1H)-ones, are isolated when the reactions are carried out either at room temperature or under a nitrogen atmosphere.
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18.
Kamal Amani Mohammad Ali Zolfigol Arash Ghorbani-Choghamarani Maryam Hajjami 《Monatshefte für Chemie / Chemical Monthly》2009,140(1):65-68
Abstract A mild, efficient, and highly selective oxidation method of sulfides to sulfoxides using Fe(NO3)3·9H2O and catalytic amounts of KBr or NaBr in the presence of wet SiO2 (50% w/w) has been developed. A variety of aliphatic and aromatic sulfides were selectively oxidized at room temperature in good to
excellent yields.
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19.
Maher F. El-Zohry Thanaa A. Mohamed Essam M. Hussein 《Monatshefte für Chemie / Chemical Monthly》2009,140(3):265-272
Abstract 2-Methylbenzimidazole 1 reacted with 3-dicyanomethylidine-1-ethyl-2-oxoindoline 2 in ethyl acetate to afford 1-amino-2-cyano-3,4-dihydro-1′-ethylspiro{benzimidazo[1,2-a]pyridine-3,3′-indolin}-2′-one 6, which was used as a key intermediate in the synthesis of fused spiropolyheterocyclic derivatives of benzimidazopyridopyrimidine
and/or benzimidazonaphthyridine nucleus incorporating an indoline moiety.
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20.
Mohamed A. A. Radwan Marwa A. Shehab Siham M. El-Shenawy 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):445-450
Abstract 5-Aminobenzo[b]thiophene-2-carboxylic acid was converted to the corresponding 5-(2-chloroacetamido)benzo[b]thiophene-2-carboxylic acid by reaction with chloroacetyl chloride. This acetamido product was treated with different alkyl,
cycloalkyl, aryl, and heterocyclic amines to afford a series of C5-substituted benzo[b]thiophenes. These compounds were found to possess potent anti-inflammatory activity.
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