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This review manuscript examines magnetic nanocatalysts and their pivotal role in forming carbon‐sulfur (C−S) and carbon‐selenium (C−Se) bonds. The study delves into the latest advancements in the synthesis, characterization, and application of magnetic nanocatalysts, highlighting their unique advantages, including enhanced catalytic activity, superior selectivity, and easy recovery through magnetic separation, which align with the principles of green chemistry. Through a critical analysis of recent research findings, this review also explores the mechanistic pathways facilitated by these nanocatalysts, offering insights into their operational efficiency and potential for recyclability. The manuscript aims not only to catalog the current achievements in this burgeoning field but also to identify challenges and propose future directions for developing more efficient, sustainable, and versatile catalytic systems for C−S and C−Se bond formation. By encompassing a broad spectrum of magnetic nanocatalysts, ranging from bare magnets to functionalized and composite materials, this review is a comprehensive resource for researchers engaged in organic synthesis, catalysis, and sustainable chemistry. This review manuscript provides an exhaustive examination of magnetic nanocatalysts and their pivotal role in the formation of carbon‐sulfur (C−S) and carbon‐selenium (C−Se) bonds. The study delves into the latest advancements in the synthesis, characterization, and application of magnetic nanocatalysts, highlighting their unique advantages, including enhanced catalytic activity, superior selectivity, and easy recovery through magnetic separation, which align with the principles of green chemistry.

Heterocycles are a vital class of compounds in numerous fields, including drug discovery, agriculture, and materials science. Efficient methods for the synthesis of heterocycles remain critical for meeting the demands of these industries. Recent advances in multicomponent reactions (MCRs) utilizing 2‐aminobenzothiazole (ABT) have shown promising results for the formation of heterocycles. The versatility of 2‐aminobenzothiazole in this context has enabled the rapid and efficient construction of diverse heterocyclic structures. Various synthetic methodologies and reactions involving 2‐aminobenzothiazole are discussed, highlighting its importance as a valuable building block in the synthesis of complex heterocycles. The potential applications of these heterocycles in drug discovery and material science are also explored. Overall, this review provides a comprehensive overview of the current state of research in the field and offers insights into the future directions of this promising area of study. We highlight the potential of ABT as a versatile and sustainable starting material in heterocyclic synthesis via MCRs, with significant implications for the chemical industry. This review highlights recent advances in multicomponent reactions using 2‐aminobenzothiazole as a starting material in the synthesis of diverse heterocycles. These reactions enable the efficient and sustainable construction of novel bioactive molecules and pharmaceuticals. The current significance of these methodologies in modern organic chemistry is discussed, along with future perspectives. The review summarizes literature published from 2017 through early 2024.

Due to the increased interest in heterocyclic compounds over the past decade, many pharmaceutical and organic chemists have explored the synthesis of various materials. Among the many organic compounds that can be synthesized in a wide range of chemical reactions, phenacyl bromide has proven to be a good, inexpensive, versatile, and efficient intermediate. This review presents an overview of the significant applications of phenacyl bromide, focusing on its role in recent synthetic advances and its utility in multicomponent reactions and literature reports for 2017 to the end of 2021.

Heterocycles are an important class of compounds that are widely used in pharmaceuticals, agrochemicals, dyes, and materials. Multicomponent reactions (MCRs) offer efficient synthetic routes for producing these complex structures. The search for effective and sustainable catalytic processes in organic synthesis has led to the exploration of various nanomaterials as potential catalysts. To this end, carbon nanotubes (CNTs) have recently emerged as promising heterogeneous catalysts for the MCR synthesis of heterocycles due to their unique properties, which include high surface area and reactivity, tunable surface chemistry, excellent electrical conductivity, recyclability, and exceptional thermal and chemical stability. This review provides a comprehensive analysis and overview of the use of CNTs as catalysts for synthesizing heterocycles via MCRs and their advantages. Graphical abstract

An efficient multicomponent reaction of newly designed β-trifluoromethyl β-diazo esters, acetonitrile, and carboxylic acids via an interrupted esterification process under copper-catalyzed conditions has been developed, which affords various unsymmetrical β-trifluoromethyl N , N -diacyl-β-amino esters in good to excellent yields. The reaction features mild conditions, a wide scope of β-amino esters and carboxylic acids, and also applicability to large-scale synthesis, thus providing an efficient way for the synthesis of β-trifluoromethyl β-diacylamino esters. Furthermore, this reaction represents the first example of a Mumm rearrangement of β-trifluoromethyl β-diazo esters.

In this study a cationic surfactant, cetyltrimethylammonium bromide (CTAB), was used as a soft template for in situ chemical polymerization of aniline on the surface of microcrystalline cellulose (MCC). The morphology of the wire-like and porous nanostructure of the resulting composite was highly dependent on the MCC and CTAB concentrations. The effect of the MCC and CTAB concentrations on the electrochemical and morphological properties of the polyaniline (PAni) nanocomposite was studied. Cyclic voltammograms of modified PAni/MCC/CTAB electrode displayed a high current response and the effect of scan rate on the current response confirmed a diffusion controlled process on the surface of the electrode that makes it suitable for sensor applications. The overlapping characteristic peaks of pure PAni and MCC caused peak broadening at 3263 cm−1 in the IR spectra of PAni/MCC/CTAB nanocomposite that revealed the interaction between NH of PAni and OH group of MCC via electrostatic interactions. The addition of MCC to PAni through chemical polymerization decreased the thermal stability of composite compared to pure PAni. Lower crystallinity was observed in the XRD diffractogram, with 2 theta values of 22.8, 16.5, and 34.6 for PAni/MCC, confirming the formation of PAni on the MCC surface.

This research introduces the preparation and analysis of a newly heterogeneous catalyst developed silica nanospheres supporting a ferrocene‐containing ionic liquid (IL) (SiO2@Benzothiazole‐Cl@Fc) for the A3 coupling reaction. The catalyst facilitates the efficient synthesis of 1,3,5‐trisubstituted pyrazoles from aromatic hydrazides, aldehydes, and aromatic alkynes. Incorporating ferrocene enhances the catalytic activity. Comprehensive characterization techniques, including NMR, Fourier transform infrared, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy, and scanning electron microscopy, confirm the successful functionalization of silica nanospheres. The catalytic performance was evaluated under various reaction conditions, demonstrating high yields and selectivity for the desired pyrazole products. This work highlights the potential of ferrocene‐based ILs in green chemistry applications, providing a sustainable approach to synthesizing valuable heterocyclic compounds. This research introduces the preparation and analysis of a newly heterogeneous catalyst developed silica nanospheres supporting a ferrocene‐containing ionic liquid (SiO2@Benzothiazole‐Cl@Fc) for the A3 coupling reaction. The catalyst facilitates the efficient synthesis of 1,3,5‐trisubstituted pyrazoles from aromatic hydrazides, aldehydes, and aromatic alkynes.

This research introduces the preparation and analysis of a newly heterogeneous catalyst developed silica nanospheres supporting a ferrocene‐containing ionic liquid (IL) (SiO 2 @Benzothiazole‐Cl@Fc) for the A3 coupling reaction. The catalyst facilitates the efficient synthesis of 1,3,5‐trisubstituted pyrazoles from aromatic hydrazides, aldehydes, and aromatic alkynes. Incorporating ferrocene enhances the catalytic activity. Comprehensive characterization techniques, including NMR, Fourier transform infrared, transmission electron microscopy, energy‐dispersive X‐ray spectroscopy, and scanning electron microscopy, confirm the successful functionalization of silica nanospheres. The catalytic performance was evaluated under various reaction conditions, demonstrating high yields and selectivity for the desired pyrazole products. This work highlights the potential of ferrocene‐based ILs in green chemistry applications, providing a sustainable approach to synthesizing valuable heterocyclic compounds.