A highly practical and efficient preparation of 3,4-Dihydropyrimidin-2(1H)-one derivatives was developed via an efficient and simple nanocatalyst and promoted multi-component reaction of ethyl acetoacetate, aromatic aldehyde, and urea in the presence of a catalytic amount of (CTA)3[SiW12]-Li+-MMT under solvent-free conditions. In comparison to the conventional methods, the salient features of this method are green reaction conditions, short reaction time, high quantitative yields, high atom economy, low cost, no column chromatographic separation and easy isolation of products. All the products were characterized by melting point, IR, 1HNMR and 13CNMR and were determined by comparison of their spectra with those of valid samples. پرونده مقاله

Co@pyr/APTZCMNPs was synthesized, and some of its characteristic analyses, such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) were investigated. The results indicated that this heterogeneous catalyst was an excellent and reusable system to synthesize of 14H-dibenzo[a.j]xanthene derivatives through a one-pot condensation of β-naphthol and arylaldehydes at 90 °C under solvent-free conditions. Due to the magnetic nature of the catalyst, it could be easily recovered by an external magnetic field and comfortable reused at least five times without loss of its catalytic activity. High yields of the desired product, easy recovery of the catalyst and solvent-free conditions were some of the advantages of our methodology. پرونده مقاله

The ionic liquid Li(OHCH2CH2NH2)(CF3OAC) was found to efficiently catalyze the three-component reaction between different enols, aldehydes, and malononitrile , leading to rapid synthesis of 2-amino-4H-chromene derivatives in fairly high yields. The catalyst is easily prepared, highly stable, simple to handle and recycled for several times without significant loss of activity. The method is simple, starts from readily accessible commercial starting materials, and provides biologically interesting products in good yields and short reaction times. The desired ionic liquids, for aromatic aldehyde leads to get the products. Heating was very effective in increasing the efficiency of the product and in the presence of heat, the desired products were created in a shorter time. پرونده مقاله

A highly practical and efficient preparation of pyrano[3,2-c]pyridone and pyrano[3,2-c]quinoline derivatives was developed via an ionic liquid mediated and promoted multi-component reaction of malononitrile, aldehyde, and 4-hydroxyquinolin-2(1H)-one or 4-hydroxy-6-methylpyridin-2(1H)-one. The combinatorial syntheses were achieved for the first time without applying extra activation energy at ambient temperature while making use of [BMIm]Cl as a catalyst solvent. پرونده مقاله

An efficient and green method for the synthesis of pyrano[3,2-c]chromene or pyrano[4,3-b]pyrone derivatives is described by using a three-component condensation process of malononitrile, aldehyde, and 4-hydroxycoumarine or 4-hydroxypyrone in [BMIm]BF4-LiCl as an ionic liquid. پرونده مقاله