Introduction of organic/inorganic Fe₃O₄@MCM‐41@Zr‐piperazine magnetite nanocatalyst for the promotion of the synthesis of tetrahydro‐4H‐chromene and pyrano[2,3‐d]pyrimidinone derivatives

Abstract

Fe3O4@MCM‐41@Zr‐MNPs modified with piperazine is easily prepared and characterized using Fourier transform infrared spectroscopy (FT‐IR), X‐ray powder diffraction (XRD), N2 adsorption–desorption, Transmission electron microscopy (TEM), Energy‐dispersive X‐ray (EDX), Vibrating sample magnetometry (VSM) and Thermogravimetric analysis (TGA) techniques. The characterization results showed that Zr highly dispersed in the tetrahedral environment of silica framework and piperazine is successfully attached to the surface of the nanocatalyst in connection with zirconium. The prepared nanosized reagent (10–30 nm), shows excellent catalytic activity in the synthesis of tetrahydro‐4H‐chromene and pyrano[2,3‐d]pyrimidinone derivatives. All reactions are performed under mild and completely heterogeneous reactions conditions in high yields during short reaction times. On the other hand and due to its superparamagnetic nature the catalyst can be easily separated by the application of an external magnetic field and reused for several times.

Fe3O4@MCM‐41@ZrCl2: A novel magnetic mesoporous nanocomposite catalyst including zirconium nanoparticles for the synthesis of 1‐(benzothiazolylamino)phenylmethyl‐2‐naphthols

“…Therefore, further research is needed to find greener and more economical methods. In continuation of our prior reports on the application of different acidic and basic catalysts, especially mesoporous, zirconium-based, and supported reagents in organic transformations, [46,[68][69][70][71][72][73][74][75][76] and in order to overcome the above mentioned restrictions, we intended to prepare a diverse range of 1-(benzothiazolylamino) phenylmethyl-2-naphthols through a three-component condensation reaction of 2-aminobenzothiazole, 2-naphthol, and a variety of aldehydes in the presence of a new magnetic mesoporous nanocomposite formulated as Fe 3 O 4 @MCM-41@ZrCl 2 . This reagent is synthesized via a simple method and characterized using different types of techniques.…”

Introduction of a New Magnetic Nanocatalyst as an Organic‐inorganic Hybrid Framework for the Synthesis of Pyrano[2,3‐d]pyrimidinone(thione)s and Pyrido[2,3‐d]pyrimidines

“…It has been more than two decades that various catalysts have been designed and introduced for the chemical reactions by our research group that each one at least has a distinguished advantage in comparison with other introduced ones . Among them, nano‐catalysts and nano‐magnetic catalysts are a unique field for our research group .…”

Periodic Mesoporous Organosilica Containing Bridged N‐Sulfonic Acid Groups: Promotion of the Synthesis of N,N’‐Diarylformamidines, Benzoxazoles, Benzothiazoles and Benzimidazoles

“…Low-angle powder X-ray diffraction (XRD) of SA-PMO is shown in Figure 2. The synthesized nano reagent exhibits a single intense peak at 2θ near 1°and another reflection peak at 2θ = 1.76°which are indexed to the (100) and (110) diffractions, [55] 2 CH(OEt) 3 3 96 180-182 182-183.5 [50] 3 CH(OEt) 3 4 94 114-116 114-116 [50] 4 CH(OEt) 3 5 90 186-187 186-187 [52] 5 CH(OEt) 3 10 90 139-141 141-143 [ 55] 6 CH(OEt) 3 8 91 125-127 126-128 [52] 7 CH(OEt) 3 12 90 113-115 113-115 [50] 8 CH(OEt) 3 10 90 100-102 108-110 [50] 9 CH(OEt) 3 3 93 238-239 239-240 [56] 10 CH(OEt) 3 25 93 133-135 133-135 [55] 11 CH(OEt) 3 20 90 195-198 195-198 [55] [a] Isolated yields.…”

“…Furthermore, easy functionalization of the bridged organic groups containing heteroelements (N, S, P, O,…) makes it possible to expand their applications as catalysts, too . Based on the mentioned properties and the advantages of periodic mesoporous organosilica materials and also the importance of sulfonic acid in the preparation of organic products and based on our experiences in the preparation of the similar types of catalysts, we have decided to synthesize and develop a new catalyst which possesses both attractive features of PMOs and sulfonic acid in the same material. To achieve this goal, the preparation of periodic mesoporous organosilica containing bridged N ‐sulfonic acid groups (SA‐PMO) and its performance as the catalyst in the preparation of benzimidazoles, benzoxazoles, benzothiazoles and N,N’ diarylformamidines have been defined as the main aim of this work.…”