Search

The preparation and characterization of cobalt aluminate (CoAl2O4) magnetic nanoparticles and its application as a catalyst for the synthesis of a novel class of pyrazol-quinazolinones and 2,3-dihydroquinazolin-4(1H)-ones is described. The structure of the catalyst was studied by Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray diffraction, and vibrating sample magnetometer analysis. The resulting cobalt aluminate (CoAl2O4) was an efficient catalyst and affords the desired products in good to excellent yields. Moreover, the catalyst could be easily recovered by magnetic separation and recycled for four times without significant loss of its catalytic activity. 2,3-Dihydroquinazolin-4(1H)-ones and a novel class of pyrazol-quinazolinones were synthesized through one-pot condensation reaction of isatoic anhydride, aromatic aldehydes, and amines using CoAl2O4 as nanoparticle heterogeneous catalyst in refluxing ethanol.

A concise, clean synthetic approach to access of 2,5-dihydro-1H-pyrrole-2-carboxylates by two-component condensation reaction of ethyl pyruvate and aniline derivatives under catalyst-free and solvent-free conditions is described. The advantages of this method are practical simplicity, catalyst-free and solvent-free conditions, high atom economy, short reaction times, and good yields of the products. The anticancer potential of synthesized compounds was evaluated against MCF7, MOLT-4 and HL-60 cells by using MTT assay. Among the tested synthesized 2,5-dihydro-1H-pyrrole-2-carboxylates (3a-h, 4a-d), compound 4d having sulfonamide moiety exhibited good cytotoxic activity against all tested cell lines and molecular docking studies also demonstrated that the results of the docking study are in reasonable agreement with cytotoxicity activities. A series of 2,5-dihydro-1H-pyrrole-2-carboxylate derivatives were synthesized by two-component condensation reaction of ethyl pyruvate and aniline derivatives under catalyst-free and solvent-free conditions.

A mild, efficient synthetic approach for the synthesis of highly functionalized dihydro-2-oxopyrroles is developed by using graphene oxide, a readily available and inexpensive material, as an eco-benign solid acid catalyst in ethanol at room temperature. The present methodology displays several advantages such as practical simplicity, high atom economy, easy workup procedure, and high yields of the products.

The synthesis of new derivatives of pyrrole substituted sulfonamide groups is described. The in vitro anticancer activity of these pyrroles was evaluated against MCF7, MOLT-4 and HL-60 cells using MTT assay. The target compounds showed inhibitory activity against tested cell lines. Among the compounds, compound 1a exhibited good cytotoxic activity. The potential of this analog to induce apoptosis was confirmed in a nuclear morphological assay by Hoechst 33258 staining in the PC-12 cells. Finally, molecular docking was performed to determine the probable binding mode of the designed pyrrole derivatives into the active site of FGFR1 protein. DFT calculations were carried out at the B3LYP levels of theory with 6-31+G (d,p) basis set for compound 1a. The point group (C1) of it was obtained based on the optimized structures; the calculation of the FT-IR vibrational frequencies, 1H NMR and 13C NMR chemical shifts of the compound were carried out and compared with those obtained experimentally.

Citric acid was polymerized onto the surface of functionalized multiwall carbon nanotubes (MWCNT-COOH) and MWCNT-graft-poly(citric acid) (MWCNT-g-PCA) hybrid materials were obtained. Due to the grafted poly(citric acid) branches, MWCNT-g-PCA hybrid materials not only were soluble in water but also were able to trap water soluble metal ions. Reduction of trapped metal ions in the polymeric shell of MWCNT-g-PCA hybrid materials by reducing agents such as sodium borohydride led to encapsulated metal nanoparticles on the surface of MWCNT. Herein palladium nanoparticles were encapsulated and transported by MWCNT-g-PCA hybrid materials (MWCNT-g-PCA-EPN) and their application as nanocatalyst toward Heck reaction in different conditions was investigated. The catalytic activity of palladium ions supported by MWCNT-g-PCA hybrid materials (MWCNT-g-PCA-PdCl2) toward Heck reactions is much more than for MWCNT-g-PCA-EPN. Structure, characteristics and catalytic activity of synthesized systems was investigated using spectroscopy and microscopy methods. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

Iron oxide nanoparticles, γ-Fe2O3NP, were deposited onto the surface of multi-walled carbon nanotubes and CNT/γ-Fe2O3NP hybrid nanomaterials were obtained. Then linear-dendritic ABA type block copolymers consisting of polyethylene glycol as B block and poly(citric acid) as A block, PCA–PEG–PCA, were synthesized and cisplatin (cis-diamminedichloroplatinum (CDDP)—a platinum-based chemotherapy drug) was conjugated with their carboxyl functional groups and CDDP/PCA–PEG–PCA anticancer prodrugs were prepared. Noncovalent interactions between CDDP/PCA–PEG–PCA anticancer prodrugs and CNT/γ-Fe2O3NP hybrid nanomaterials led to CDDP/PCA–PEG–PCA/CNT/γ-Fe2O3NP drug delivery systems. There are several key features of these hybrid drug delivery systems: (i) their ability to cross cell membranes and also high surface area per unit weight for high drug loading assigned to CNTs, (ii) high functionality, water solubility and biocompatibility assigned to PCA–PEG–PCA linear-dendritic copolymers and (iii) targeting tumors using a magnetic field assigned to γ-Fe2O3 nanoparticles. The efficacy of drug delivery systems for killing the cancer cells and targeting the drugs towards tumors was investigated.

Hybrid nanomaterial-based drug delivery systems (HNDDSs) consisting of carbon nanotubes and linear–dendritic copolymers linked to anticancer drugs were synthesized and characterized. Polycitric acid–polyethylene glycol–polycitric acid (PCA–PEG–PCA) linear–dendritic copolymers were used to solubilize and functionalize multi-walled carbon nanotubes (MWCNTs) by noncovalent interactions. There are two key features of HNDDSs: (a) functionalized MWCNTs as a biocompatible platform for the delivery of therapeutic agents and diagnostics, (b) PCA–PEG–PCA linear–dendritic copolymers as water soluble, biocompatible and highly functional hybrid materials with a linear PEG block and two dendritic PCA blocks that improve the solubility and functionality of MWCNTs respectively. In this work, cisplatin (cis-diamminedichloroplatinum (CDDP)—a platinum-based chemotherapy drug) was conjugated to the carboxyl functional groups of the dendritic blocks of PCA–PEG–PCA linear–dendritic copolymers and then the prodrugs interacted with the MWCNTs noncovalently and HNDDSs were obtained. To prove the efficacy of the synthesized HNDDSs, they were subjected to endocytosis and released CDDP molecules inside murine colon adenocarcinoma tumor C26 cancer cells. Then it was proved that HNDDSs are able to kill cancer cells effectively. Release of the anticancer drug from HNDDSs was also investigated.