2010-06-2Relevant articles and documents
Microwave-assisted synthesis of novel N-(4-phenylthiazol-2-yl)-benzo[d]thiazole-, thiazolo[4,5-b]pyridine-, thiazolo[5,4-b]pyridine- and benzo[d]oxazole-2-carboximidamides inspired by marine topsentines and nortopsentines
Deau, Emmanuel,Dubouilh-Benard, Carole,Levacher, Vincent,Besson, Thierry
, p. 5532 - 5540 (2015)
We report the synthesis of novel N-(4-phenylthiazol-2-yl)-substituted benzo[d]thiazole-, thiazolo[4,5-b]pyridine-, thiazolo[5,4-b]pyridine- and benzo[d]oxazole-2-carboximidamides, which were inspired by marine topsentines and nortopsentines. Condensation of 4,5-dichloro-1,2,3-dithiazolium chloride (Appel salt) with various ortho-halogenated anilines, aminopyridines and aminophenols gave the corresponding aryliminodithiazoles in good to excellent yields. Copper(I)-mediated or nucleophilic-assisted cyclization of aryliminodithiazoles furnished cyano-functionalized benzo[d]thiazoles, thiazolo[4,5-b]- and thiazolo[5,4-b]-pyridines and benzo[d]oxazoles. The latter were condensed with substituted 4-phenylthiazol-2-amines to furnish twenty seven new polyaromatic carboximidamides in moderate to good yields.
Synthesis of 2-aminothiazoles from methylcarbonyl compounds using a Fe3O4 nanoparticle-: N -halo reagent catalytic system
Sadeghi, Masoud,Safari, Javad,Zarnegar, Zohre
, p. 64749 - 64755 (2016)
An efficient protocol is developed for the synthesis of 2-aminothiazoles from unfunctionalized methylcarbonyl compounds using Fe3O4 nanoparticle-N-halo reagent catalytic systems. 1,3-dichloro-5,5-dimethylhydantoin (DCDMH), N-bromosuccinimide (NBS) and N-iodosuccinimide (NIS) as N-halo reagents were explored and the best results were obtained for DCDMH. Fe3O4 nanoparticle-DCDMH as an active, reusable, excellent, highly stable magnetic catalyst was used in this process. Advantages of this efficient method include greener and cleaner conditions, shorter reaction time, excellent yield of products, easy separation using a simple external magnetic field, low cost and operational simplicity.
Joining Microfluidics with Infrared Photodissociation: Online Monitoring of Isomeric Flow-Reaction Intermediates
Pahl, Maik,Mayer, Martin,Schneider, Maximilian,Belder, Detlev,Asmis, Knut R.
, p. 3199 - 3203 (2019)
A cryogenic ion trap vibrational spectrometer is combined with a microfluidic chip reactor in a proof-of-principle experiment on the Hantzsch cyclization reaction forming 2-amino-4-phenyl thiazole from phenacyl bromide and thiourea. First, the composition of the reaction solution is characterized using electrospray-ionization mass spectrometry combined with two-color infrared photodissociation (IRPD) spectroscopy. The latter yields isomer-specific vibrational spectra of the reaction intermediates and products. A comparison to results from electronic structure calculations then allows for an unambiguous structural assignment and molecular-level insights into the reaction mechanism. Subsequently, we demonstrate that isomeric and isobaric ions can be selectively monitored online with low process time, i.e., using a single IRPD wavelength per isomer, as the chip reaction parameters are varied.
MNPs@SiO2-Pr-AP: A new catalyst for the synthesis of 2-amino-4-aryl thiazole derivatives
Ghorbani-Vaghei, Ramin,Alavinia, Sedigheh,Merati, Zohreh,Izadkhah, Vida
, (2018)
A simple and efficient synthesis of 2-amino-4-aryl thiazole derivatives was carried out through the reaction of substituted acetophenones and thiourea using three different types of catalytic systems including N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide [TBBDA], poly(N,N′-dibromo-N-ethylbenzene-1,3-disulfonamide) [PBBS] and a combination of TBBDA and nano-magnetic catalyst supported with functionalized 4-amino-pyridine silica (MNPs@SiO2-Pr-AP). The results showed that the use of TBBDA along with the MNPs@SiO2-Pr-AP gains the highest yields of the products in the shortest reaction time.
Magnetic carbon nanotube-supported imidazolium cation-based ionic liquid as a highly stable nanocatalyst for the synthesis of 2-aminothiazoles
Zarnegar, Zohre,Safari, Javad
, p. 1043 - 1049 (2016)
Magnetic carbon nanotube-supported imidazolium ionic liquid (CNT-Fe3O4-IL) was synthesized and investigated using various characterization techniques, including Fourier transform infrared and Raman spectroscopies, X-ray diffraction, vibrating sample magnetometry, scanning and transmission electron microscopies, and thermogravimetric and differential thermal analyses. In order to synthesize the CNT-Fe3O4-IL nanocomposites, Fe3O4-decorated multi-walled CNTs were modified with 1-methyl-3-(3-trimethoxysilylpropyl)-1H-imidazol-3-ium chloride. This catalytic system was found to be a highly stable, active, reusable and solid-phase catalyst for the synthesis of 2-aminothiazoles via the one-pot reaction of ketone, thiourea and N-bromosuccinimide under mild conditions. Immobilized magnetic ionic liquid catalysis combines the advantages of ionic liquid media with magnetic solid support nanomaterials which enables the application of nanotechnology and green chemistry in chemical processes. Copyright
Copper acetate-catalyzed, mild, highly efficient, and practical synthesis of thiazoles and aminothiazoles
Meshram,Kumar, D. Aravind,Vara Prasad, B. Ramalinga
, p. 2317 - 2320 (2009)
A mild and highly efficient synthesis of thiazoles by the condensation of α-bromo ketones with thiourea in the presence of a catalytic amount of copper acetate at room temperature has been described. The method is applicable for a variety of aryl and alkyl α-bromo ketones. The catalyst is inexpensive, and substituted thiazoles are obtained in good yields.
Asparagine functionalized Al2O3 nanoparticle as a superior heterogeneous organocatalyst in the synthesis of 2-aminothiazoles
Zarnegar, Zohre,Shokrani, Zahra,Safari, Javad
, p. 143 - 152 (2019)
Asparagine functionalized aluminum oxide nanoparticles (Asp-Al2O3) have been prepared by a two-step procedure involving the grafting of Al2O3 with 3-chloropropyltrimethoxysilane (CPTMS) and subsequent organofunctionalization using asparagine amino acid. It is shown that Asp-Al2O3 exhibits as an active nanocatalyst for the preparation of 2-aminothiazoles is achieved by one-pot reaction of methylcarbonyls, thiourea and iodine. The structure of Asp-Al2O3 was characterized by fourier transform infrared radiation (FT-TR), thermal gravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopic (SEM), and energy-dispersive analysis of X-ray (EDAX) analyses. Advantages of this modified methodology include higher purity and excellent yield of products, greener and cleaner conditions, easy isolation of products and convenient manipulation. Moreover, immobilization of organocatalysts on the Al2O3 surface are stable under the catalytic reaction conditions resulting their efficient reuse.
Montmorillonite K10: an effective catalyst for synthesis of 2-aminothiazoles
Safari, Javad,Sadeghi, Masoud
, p. 8175 - 8183 (2016)
An efficient one-pot synthesis of 2-aminothiazoles from methylcarbonyl and thiourea has been developed using montmorillonite-K10 as a catalyst at 80?°C in DMSO medium. A plausible mechanism is proposed in which α-iodomethylcarbonyls are formed via methylcarbonyls as raw material using iodine as iodination reagent.
Novel acetamidothiazole derivatives: Synthesis and in vitro anticancer evaluation
Ali, Ahmed R.,El-Bendary, Eman R.,Ghaly, Mariam A.,Shehata, Ihsan A.
, p. 908 - 919 (2013)
A novel series of acetamide derivatives possessing both 2-imino-4-arylthiazoles and morpholine or different piperazines were synthesized and characterized by IR, 1H NMR, 13C NMR, elemental and mass spectral analyses. Twelve compounds were granted NSC codes at National Cancer Institute (NCI), USA for anticancer activity at a single high dose (10-5 M) in full NCI 60 cell panel. Among the compounds tested, compounds 5a and 6b were found to be the most active candidates of the synthesized series. Assessment of toxicities, druglikeness, and drug score profiles of compounds 5a and 6b are promising. Some of the synthesized compounds showed a good docking score with potential anticancer targets, chosen based on pharmacophore mapping of the established derivatives.
Synthesis of 2-amino-4-phenylthiazole under conditions of microwave irradiation
Khrustalev,Suleimenova,Fazylov
, p. 900 - 900 (2008)
The possibility of preparing 2-amino-4-phenylthiazole from acetophenone, iodine, and thiourea under the conditions of microwave irradiation was studied.