共查询到20条相似文献,搜索用时 31 毫秒
1.
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.
Graphical abstract
相似文献
2.
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.
Graphical abstract
相似文献
3.
Arash Ghorbani-Choghamarani Maryam Hajjami Hamid Goudarziafshar Mohsen Nikoorazm Shadpour Mallakpour Fatemeh Sadeghizadeh Gouhar Azadi 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):607-610
Abstract A simple and efficient catalytic oxidation of urazoles and a bis-urazole to the corresponding triazolinediones by treatment
with Al(NO3)3.9H2O in the presence of a catalytic amount of silica sulfuric acid is described. A good range of urazole derivatives was selectively
oxidized in CH2Cl2 at room temperature in good to excellent yields.
Graphical abstract
相似文献
4.
Min Wang Zhi-Guo Song Hong Gong Heng Jiang 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):177-179
Abstract Tetrahydropyranylation of alcohols and phenols was accomplished successfully using copper nitrate and acetic acid as a synergistic
catalyst at room temperature under solvent-free condition. Compared with other synergistic catalytic systems, copper nitrate/acetic
acid proved to be the most efficient. Both alcohols (primary, secondary, tertiary, benzylic, cyclic, allyl, cinnamyl, and
furyl) and phenols reacted smoothly in high yields.
Graphical abstract
相似文献
5.
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.
Graphical abstract
相似文献
6.
Bożena Modzelewska-Banachiewicz Barbara Michalec Teresa Kamińska Liliana Mazur Anna E. Kozioł Jacek Banachiewicz Marzena Ucherek Martyna Kandefer-Szerszeń 《Monatshefte für Chemie / Chemical Monthly》2009,140(4):439-444
Abstract (Z)-3-(3,4-diaryl-1,2,4-triazole-5-yl)prop-2-enoic acid derivatives were obtained in the course of the reaction of N
3-substituted amidrazones with maleic anhydride, and isomerized into the (E) isomers by heating under reflux in acetic acid solution. The molecular structure of the compounds obtained was confirmed
by IR and 1H NMR spectroscopy, and by X-ray crystallography for (2E)-3-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)prop-2-enoic acid. The antiviral and immunomodulating activity of several of the compounds was examined.
Graphical abstract
相似文献
7.
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.
Graphical abstract
相似文献
8.
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.
Graphical abstract
相似文献
9.
Lu Chen Xu-Jiang Huang Yi-Qun Li Mei-Yun Zhou Wen-Jie Zheng 《Monatshefte für Chemie / Chemical Monthly》2009,122(3):45-47
Abstract
A simple, clean, and environmentally benign three-component process to the synthesis of 2-amino-4H-chromenes using N,N-dimethylaminoethylbenzyldimethylammonium chloride, [PhCH2Me2N+CH2CH2NMe2]Cl−, as an efficient catalyst under solvent-free condition is described. A wide range of aromatic aldehydes easily undergo condensations with α-naphthol and malononitrile under solvent-free condition to afford the desired products of good purity in excellent yields. Taking into account environmental and economical considerations, the protocol presented here has the merits of environmentally benign, simple operation, convenient work-up and good yields. Furthermore, the catalyst can be easily recovered and reused for at least five cycles without losing its activities. 相似文献10.
Nagnnath D. Kokare Devanand B. Shinde 《Monatshefte für Chemie / Chemical Monthly》2009,140(2):185-188
Abstract Aromatic aldoximes were converted to the corresponding nitriles in good to excellent yields by employing phosphoric acid diethyl
ester 2-phenylbenzimidazol-1-yl ester as reagent. The method was equally effective for oximes bearing electron-donating and
electron-withdrawing substituents.
Graphical Abstract
相似文献
11.
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.
Graphical abstract
相似文献
12.
Amin Rostami Sadegh Rahmati Ardeshir Khazaei 《Monatshefte für Chemie / Chemical Monthly》2009,140(6):663-667
Abstract Molecular iodine generated in situ from Fe(NO3)3·9H2O/NaI acts as a highly efficient catalyst for tetrahydropyranylation of various alcohols and phenols with 3,4-dihydro-2H-pyran in almost quantitative yields. The reaction occurs rapidly in dichloromethane at room temperature, and use of toxic
molecular iodine is avoided.
Graphical Abstract
相似文献
13.
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.
Graphical abstract
相似文献
14.
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.
Graphical abstract
相似文献
15.
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.
Graphical Abstract
相似文献
16.
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.
Graphical abstract
相似文献
17.
Abstract An efficient one-pot synthesis of amidoalkyl naphthols is described. This involves the three-component reaction of 2-naphthol,
aromatic aldehydes and amide or urea in the presence of a catalytic amount of 2,4,6-trichloro-1,3,5-triazine (TCT, cyanuric
chloride) under solvent-free conditions.
Graphical abstract
相似文献
18.
Abstract A classical convergent approach for the synthesis of the anticancer drug imatinib has been substantially improved. Imatinib
was assembled by coupling the amine and carboxylic acid precursors by using N,N′-carbonyldiimidazole (CDI) as a condensing agent. Both intermediates have been synthesized by novel efficient methods.
Graphical abstract
相似文献
19.
Emanuel Makrlík Ji?í Dybal Petr Vaňura 《Monatshefte für Chemie / Chemical Monthly》2009,286(1):1289-1292
Abstract From extraction experiments in the two-phase water–nitrobenzene system and γ-activity measurements, the stability constant
of protonated tetraethyl p-tert-butylcalix[4]arene tetraacetate in nitrobenzene saturated with water was determined. By using DFT calculations, the most
probable structure of the tetraethyl p-tert-butylcalix[4]arene tetraacetate·H3O+ complex species was derived.
Graphical Abstract
相似文献
20.
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.
Graphical abstract
相似文献